LED Drivers for LCD Backlights White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type) BD6583MUV-A No.11040ECT32 Description BD6583MUV-A is white LED driver IC with PWM step-up DC/DC converter that can boost max 42.5V and current driver that can drive max 25mA. The wide and precision brightness can be controlled by external PWM pulse. BD6583MUV-A has very accurate current drivers, and it has few current errors between each strings. So, it will be helpful to reduce brightness spots on the LCD.Small package type is suited for saving space. Features 1) High efficiency PWM step-up DC/DC converter (fsw=1MHz), max efficiency 93% 2) High accuracy & good matching (3%) current drivers 6ch * * 3) Drive up to 12 in series, 6 strings in parallel =72 white LEDs ( white LED Vf=3.5Vmax) 4) Wide input voltage range (2.7V ~ 22V) 5) Rich safety functions Over-voltage protection (OVP) Over current limit External SBD open detect Thermal shutdown 6) Small & thin package (VQFN024V4040) 4.0 x 4.0 x 1.0mm Applications All middle size LCD equipments backlight of Notebook PC, portable DVD player, car navigation systems, etc. Absolute maximum ratings (Ta=25 ) Parameter Symbol Ratings Unit Maximum applied voltage 1 VMAX1 7 V TEST,VREG,SENSP,SENSN,SW,RSTB, PWMPOW,PWMDRV,FAILSEL,ISETH,ISETL Maximum applied voltage 2 VMAX2 25 V LED1, LED2, LED3, LED4, LED5, LED6, VBAT Maximum applied voltage 3 VMAX3 50.5 V VDET Power dissipation 1 Pd1 500 mW *1 Power dissipation 2 Pd2 780 mW *2 Power dissipation 3 Pd3 1510 mW *3 Operating temperature range Topr -30 ~ +85 - Storage temperature range Tstg -55 ~ +150 - (*1) (*2) (*3) Condition Reduced 4.0mW/ With Ta>25 when not mounted on a heat radiation Board. 1 layer (ROHM Standard board) has been mounted. Copper foil area 0mm2, When it's used by more than Ta=25 , it's reduced by 6.2mW/ . 4 layer (JEDEC Compliant board) has been mounted. Copper foil area 1layer 6.28mm2, Copper foil area 2~4layers 5655.04mm2, When it's used by more than Ta=25 , it's reduced by 12.1mW/ . Recommended operating range (Ta=-30 ~ +85 ) Ratings Parameter Symbol Min. Typ. Max. Power supply voltage VBAT www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 2.7 12.0 22.0 1/26 Unit Condition V 2011.06 - Rev.C BD6583MUV-A Technical Note Electrical characteristic (Unless otherwise specified, VBAT=12V, RSTB=2.5V, Ta = +25 ) Limits Parameter Symbol Min. Typ. Max. Unit Condition [FAILSEL,PWMDRV Terminal] EN threshold voltage (Low) VthL 0 - 0.2 V EN threshold voltage (High) 1 VthH1 1.4 - 5.0 V VBAT>5.0V EN threshold voltage (High) 2 VthH2 1.4 - VBAT V VBAT<5.0V Iin - 8.3 14.0 A Input=2.5V PWML 0 - 0.2 V High input voltage range1 PWMH1 1.4 - 5.0 V VBAT>5.0V High input voltage range2 PWMH2 1.4 - VBAT V VBAT<5.0V PWM pull down resistor PWMR 300 500 700 k RSTBL 0 - 0.2 V High input voltage range1 RSTBH1 2.25 2.5 5.0 V VBAT>5.0V High input voltage range2 RSTBH2 2.25 2.5 VBAT V VBAT<5.0V IRSTB - 89 134 A RSTB=2.5V, LED1-6=3V VREG voltage VREG 4.0 5.0 6.0 V No load Under voltage lock out UVLO 2.05 2.25 2.65 V Quiescent current 1 Iq1 - 0.6 3.4 A RSTB=0V, VBAT=12V Quiescent current 2 Iq2 - 4.6 10 A RSTB=0V, VBAT=22V Current consumption Idd - 3.4 5.1 mA VDET=0V,ISETH=24k LED control voltage VLED 0.4 0.5 0.6 Over current limit voltage Ocp 70 100 130 SBD open protect Sop - - 0.1 V Switching frequency fSW 0.8 1.0 1.2 MHz Duty cycle limit Duty 92.5 95.0 99.0 % LED1-6=0.3V Over voltage limit Ovl 43.0 44.7 46.4 V LED1-6=0.3V LED maximum current ILMAX - - 25 mA LED current accuracy ILACCU - - 5 % ILED=16mA Each LED current/Average (LED1- 6) ILED=16mA EN terminal input current [PWMPOW Terminal] Low input voltage range [RSTB Terminal] Low input voltage range Current consumption [Regulator] [Switching Regulator] V mV *1 Detect voltage of VDET pin [Current driver] LED current matching ILMAT - - 3 % Iset 0.5 0.6 0.7 V ILOCP 35 60 90 mA LEDOVP 10.0 11.5 13.0 V ISET voltage LED current limiter LED terminal Over voltage protect Current limit value at ISET resistor 4.7k setting LED1, 2, 3, 4, 5, 6=0.5V RSTB=PWMDRV=2.5V (*1) This parameter is tested with DC measurement. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 2/26 2011.06 - Rev.C BD6583MUV-A Technical Note Reference data 4 25 3.5 1.2 7 1.15 25 125 6 3 2 -30 1.5 25 4 3 2 1 0.5 2 Fig.1 Current Consumption vs VBAT 4 6 0.8 2 Efficiency [] 100% 95% 95% 90% 90% 85% 85% 12V 6V 75% 16V 0 110125 25 0 1.0 20 18 0.9 18 16 0.8 12V 12 10 6V 8 6 2 Ta=-50,+25,+125 0.5 6V 0.4 0.3 0 Fig.9 LED current vs PWMDRV H Duty PWM = 200Hz, 1kHz,10kHz 18 6 4 2 Ta=-50,+25,+125 16V 0.7 0.6 0.5 12V 6V 0.4 0.3 Ta=-50,+25,+125 0 10 20 30 40 50 60 70 80 90 10 Duty (%) 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Duty (%) Fig.10 LED current vs PWMPOW H Duty PWM = 200Hz Fig.11 LED current vs PWMPOW H Duty (Expansion) PWM = 200Hz www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 12 200Hz 10 8 6 10kHz 2 0 0.0 0 1kHz 14 4 0.2 0.1 LED Current (mA) 8 16 0.8 LED current (mA) 6V 10 20 30 40 50 60 70 80 90 100 Duty (%) 20 10 10kHz 0 0.9 12V 90 100 6 1.0 12 80 8 18 14 70 2 Ta=-50,+25,+125 Fig.8 LED current vs PWMDRV H Duty (Expansion) PWM = 200Hz 16V 60 10 20 16 50 200Hz 12 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Duty (%) Fig.7 LED current vs PWMDRV-HI Duty PWM = 200Hz 40 1kHz 14 0.0 10 20 30 40 50 60 70 80 90 10 0 Duty (%) 30 4 0.2 0.1 0 0 12V 0.6 20 16 16V 0.7 LED Current (mA) 16V 10 Fig.6 Efficiency vs PWMDRV H Duty ISETH=24k, PWM=200Hz 20 14 16V 12V Duty [%] Fig.5 Efficiency vs PWMPOW H Duty ISETH=24k, PWM=200Hz LED current (mA) LED current (mA) 6V 75% Duty [%] 4 LED current (mA) 80% 60% 10 20 30 40 50 60 70 80 90 100 Ta [oC] Fig.4 UVLO vs Temperature 22 65% 60% -60 17 70% 65% 2.2 12 Fig.3 Oscillation frequency vs VBAT 100% 80% 7 VBAT [V] 70% 2.22 125 0.9 8 10 12 14 16 18 20 22 VBAT[V] Fig.2 Quiescent current vs VBAT 2.28 2.24 0.95 0.85 VBAT [V] 2.3 -60 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 2.26 1.05 -60 1 0 VBAT [V] 1.1 5 2.5 Ist[A] Iin [mA] 8 Frequency [MHz] 85 Efficiency [] 4.5 3/26 0 10 20 30 40 50 60 70 80 90 10 0 Duty (%) Fig.12 LED current vs PWMPOW H Duty PWM = 200Hz, 1kHz,10kHz 2011.06 - Rev.C Technical Note 3.0 3.0 2.0 2.0 Current Matching (%) Current Matching (%) BD6583MUV-A Max Matching = Max LED Current/Average Current 1.0 0.0 -1.0 Min Matching = Min LED Current/Average Current -2.0 Max Matching = Max LED Current/Average Current 1.0 0.0 VOUT 350mV -1.0 Min Matching = Min LED Current/Average Current -2.0 -3.0 0% 20% 40% 60% 80% 10mA/div LED Current -3.0 100% 0% 2% 4% 6% 8% 10% PWM HI Duty (%) PWM HI Duty (%) Fig.13 Fig.14 LED current matching vs PWMDRV H Duty LED current matching vs PWMDRV H Duty PWM = 200Hz (Expansion) 3.0 3.0 2.0 2.0 1.0 Current Matching (%) Current Matching (%) PWMDRV Max Matching = Max LED Current/Average Current 0.0 -1.0 Min Matching = Min LED Current/Average Current PWMPOW Max Matching = Max LED Current/Average Current 1.0 VOUT 0.0 10mA/div Min Matching = Min LED Current/Average Current LED Current -3.0 -3.0 0% 20% 40% 60% 80% 0% 100% 2% 4% 6% 8% 10% PWM HI Duty (%) PWM HI Duty (%) Fig.16 Fig.17 LED current matching vs PWMPOW H Duty LED current matching vs PWMPOW H Duty PWM = 200Hz LEDCurrent [mA] 180mV -1.0 -2.0 -2.0 PWM = 200Hz Fig.15 VOUT response Driver Control PWM (PWMDRV) 16.30 16.25 16.20 16.15 16.10 16.05 16.00 15.95 15.90 15.85 15.80 15.75 15.70 (Expansion) PWM = 200Hz 5V Fig.18 VOUT response Power Control PWM (PWMPOW) VBAT 7V 12V VBAT 22V 400s 14ms VOUT VOUT 2.7V No peak No peak LED current -60 -40 -20 0 LED current 20 40 60 80 100 120 ] temp [[oC] Fig.19 LED current vs Temperature PWMDRV=H, ISETH=30k (16mA setting) Fig.20 Line Transient (10V to 22V) Fig.21 Line Transient (22V to 10V) VOUT Icc Fig.22 VOUT@OVP (LED OPEN) www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 4/26 2011.06 - Rev.C BD6583MUV-A Technical Note Package outline Type D6583 LOT No. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 5/26 2011.06 - Rev.C BD6583MUV-A Technical Note Block diagram, I/O equivalent circuit diagram VBAT VREG RSTB VIN detector 300k PW MPOW REG TSD over voltage protect 300k S PW Mcomp + Control sence R 1M SENSP 100K SENSN + Current Sence PIN PIN ERRAMP + B VBAT VBAT LED2 LED3 LED4 LED5 PIN PIN PIN LED6 5.5V GND D Clump E F VBAT VREG LED TERMINAL Over Voltage Protect PW MDRV PIN 300k ISETL C LED1 GND ISETH GND A LED TERMINAL Detect 100k PIN GND + - OSC TEST VBAT VREG VDET + - SBD Open protect FAILSEL Q VBAT Internal Power suplly 500k SW UVLO ISET H Resistor driver PW MDRV=H On GND GND GND - G ISET L Resistor driver GND + PW MDRV=L On Current Driver GND Fig.24 I/O equivalent circuit diagram Fig.23 Block diagram Pin assignment table PIN Name In/Out PIN number 1 2 3 4 5 6 7 8 VDET N.C. GND SW SENSP TEST SENSN GND In Out In In In - 9 ISETH In 10 ISETL In 11 12 13 14 15 16 17 18 19 20 21 22 23 24 PWMDRV LED1 LED2 LED3 GND LED4 LED5 LED6 FAILSEL GND RSTB VREG PWMPOW VBAT In In In In In In In In In Out In In www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. Function Detect input for SBD open and OVP No connect pin GND Switching Tr drive terminal + Side Current sense terminal TEST input (Pull down 100k to GND) - Side Current sense terminal GND Resistor connection for LED current setting at PWMDRV=H Resistor connection for LED current setting at PWMDRV=L PWM input pin for power ON/OFF only driver Current sink for LED1 Current sink for LED2 Current sink for LED3 GND Current sink for LED4 Current sink for LED5 Current sink for LED6 Latch selectable pin of protect function GND Reset pin L :Reset H :Reset cancel Regulator output / Internal power-supply PWM input pin for power ON/OFF Battery input 6/26 Terminal equivalent circuit diagram C F B G G G A B A A E C C C B C C C E B E D E C 2011.06 - Rev.C BD6583MUV-A Technical Note Application example Battery Battery 4.7H 10F 10LED x 6parallel 4.7H 10F 2.2F * RTR020N05 SW FAILSEL SENSP RTR020N05 SW VDET SENSN Power ON/OFF RSTB RSTB LED1 PWMPOW LED2 PWMDRV 200Hz PWM LED3 VBAT LED1 PWMPOW LED2 PWMDRV LED3 VBAT LED4 LED4 VREG 1F VDET 150m SENSN 200Hz PWM FAILSEL SENSP 100m Power ON/OFF 10LED x 4aprallel 2.2F * VREG LED5 1F GND GND GND GND TEST ISETH ISETL LED6 GND GND GND GND TEST ISETH ISETL LED6 Each 20mA Each 20mA 24k LED5 24k Fig.26 10 series x 4parallel Fig.25 10 series x 6parallel H current 20mA setting H current 20mA setting Current driver PWM application Current driver PWM application * Please select the capacitor which the little bias fluctuation. Battery Battery 4.7H 10F 10LED x 6parallel 4.7H 10F 2.2F * RTR020N05 SW 10LED x 6parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 100m VDET 100m SENSN Power ON/OFF SENSN Power ON/OFF RSTB LED1 PWMPOW LED3 VBAT LED4 VREG LED2 PWMDRV 200Hz PWM LED3 VBAT 1F LED1 LED2 PWMDRV 200Hz PWM RSTB PWMPOW 2.7V to 5.5V LED5 1F GND GND GND GND TEST ISETH ISETL LED6 LED4 VREG LED5 GND GND GND GND TEST ISETH ISETL LED6 Each 20mA Each 20mA 24k 24k Fig.27 10 series x 6parallel LED Fig.28 Non-used Inside REG or operating current 20mA setting Power control PWM application under 5V application * Please select the capacitor which the little bias fluctuation. Terminal processing TEST pin= Connect to GND N.C. = Nothing specified in particular. Open is recommended. VREG= When IC is driving from the outside of 2.7~5.5V, short VBAT and VREG, and put the voltage to VREG FAILSEL, PWMDRV= Connect to GND in case of fixing at L level. Connect to VREG of IC or the power supply of more than 1.4V in case of fixing at H level . LED1-6= When each LED driver are not used, connect to GND of IC GND = Each GND is connecting inside IC, but, connect to GND of all board RSTB= RSTB is used as a power supply of internal circuit. So, you mustn't input RSTB voltage with pull up resistor of several k. And, please care about the relation between VBAT and RSTB enough. (ref. P9) www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 7/26 2011.06 - Rev.C BD6583MUV-A Technical Note Description of Functions 1) PWM current mode DC/DC converter While BD6583MUV-A is power ON, the lowest voltage of LED1, 2, 3, 4, 5, 6 is detected, PWM duty is decided to be 0.5Vand output voltage is kept invariably. As for the inputs of the PWM comparator as the feature of the PWM current mode, one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal that controls the inductor current into Slope waveform to prevent sub harmonic oscillation. This output controls external Nch Tr via the RS latch. In the period where external Nch Tr gate is ON, energy is accumulated in the external inductor, and in the period where external Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD.BD6583MUV-A has many safety functions, and their detection signals stop switching operation at once. 2) Soft start BD6583MUV-A has soft start function. The soft start function prevents large coil current. Rush current at turning on is prevented by the soft start function. After RSTB is changed L H, when PWMPOW is changed L H, soft start becomes effective for within 1ms and soft start doesn't become effective even if PWMPOW is changed L H after that. And, when the H section of PWMPOW is within 1ms, soft start becomes invalid when PWMPOW is input to H more than three times. The invalid of the soft start can be canceled by making RSTB L. 3) FAILSEL pin When the error condition occurs, boost operating is stopped by the protection function, and the error condition is avoided. On that occasion, the way to stop of boost operating by the protection function can be selected with FAILSEL pin. Details are as shown in Fig.29, 30. After power ON, when the protection function is operating under about 1ms have passed, the stop state of the boost operating can be held through FAILSEL is H, the stop state can reset through RSTB is L. And, boost operating is stopped when the protection function is operating through FAILSEL is L, but when the protection function becomes un-detect, boost operating is started again. It never keeps holding the stop state of boost operating. In PWM control by PWMDRV can't use this function. When it is off over 10ms on PWM control by PWMPOW using this function, it may be stopped the boost operating as over current protection work at off on PWMPOW=L. Object of protect function is as shown below. Over-voltage protection External SBD open detect Thermal shutdown LED terminal over-voltage protection Over current limit < When it is off on PWMPOW> <FAILSEL=H> RSTB RSTB about 1ms PWMDRV FAILSEL un-operating range PWMPOW Protection function un-detection "H" Boost operating off detection normal operating Output voltage un-detection boost stop Coil current off normal operating valid RSTB RSTB PWMDRV about 1ms "L" Protection function Boost operating invalid < When it is off on RSTB> <FAILSEL=L> FAILSEL FAILSEL function PWMPOW un-operating range un-detectio detection Output voltage un-detection Coil current off normal operating boost stop normal operating off normal Fig.29 FAILSEL operating description www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. FAILSEL function invalid Fig.30 FAILSEL=H light off control 8/26 2011.06 - Rev.C BD6583MUV-A Technical Note 4) External SBD open detect and over voltage protection BD6583MUV-A has over boost protection by external SBD open and over voltage protection. It detects VDET voltage and is stopped output Tr in abnormal condition. Details are as shown below. External SBD open detect In the case of external SBD is not connected to IC, the coil or external Tr may be destructed. Therefore, at such an error as VOUT becoming 0.1V or below, the Under Detector shown in the figure works, and turns off the output Tr, and prevents the coil and the IC from being destructed. And the IC changes from activation into non-activation, and current does not flow to the coil (0mA). Over voltage protection At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC will boost too much and the VDET terminal exceed the absolute maximum ratings, and may destruct the IC. Therefore, when VDET becomes sensing voltage or higher, the over voltage limit works, and turns off the output Tr, and the pressure up made stop. At this moment, the IC changes from activation into non-activation, and the output voltage goes down slowly. And, when the output voltage becomes the hysteresis of the over voltage limit or below, the output voltage pressure up to sensing voltage once again and unless the application error is recovered, this operation is repeated. 5) Thermal shut down BD6583MUV-A has thermal shut down function. The thermal shut down works at 175C or higher, and the IC changes from activation into non-activation. Because non-activation is different from RSTB=L, it doesn't' be reset inside IC. Moreover, even if thermal shut down function works, soft start, FAILSEL, selection the number of LED lines of the current driver and starting current setting at PWMDRV=L related RSTB are hold. 6) Over Current Limit Over current flows the current detection resistor that is connected to switching transistor source and between GND, SENSP pin voltage turns more than detection voltage, over current protection is operating and it is prevented from flowing more than detection current by reducing ON duty of switching Tr without stopping boost. As over current detector of BD6583MUV-A is detected peak current, current more than over current setting value does not flow. And, over current value can decide freely by changing over current detection voltage. <Derivation sequence of detection resistor> Detection resistor =Over current detection voltage / Over current setting value TYP value of over current detection voltage is 100mV, MIN = 70mV and MAX = 130mV and after the current value which was necessary for the normal operation was decided, detection resistor is derived by using MIN value of over current detection value. For example, detection resistor when necessary current value was set at 1A is given as shown below. Detection resistor =70mV / 1A = 70m MAX current dispersion of this detection resistor value is MAX current = 130mV / 70m = 1.86A <The estimate of the current value which need for the normal operation> As over current detector of BD6583MUV-A is detected the peak current, it have to estimate peak current to flow to the coil by operating condition. In case of, Supply voltage of coil = VIN Inductance value of coil = L Switching frequency = fsw MIN=0.8MHz, Typ=1MHz, MAX=1.2MHz Output voltage = VOUT Total LED current = IOUT Average current of coil = Iave Peak current of coil = Ipeak Efficiency = eff (Please set up having margin, it refers to data on p.3.) ON time of switching transistor = Ton Ipeak = (VIN / L) x (1 / fsw) x (1-(VIN / VOUT)) Iave=(VOUT x IOUT / VIN) / eff 1/2 Ton=(Iave x (1-VIN/VOUT) x (1/fsw) x (L/VIN) x 2) Each current is calculated. As peak current varies according to whether there is the direct current superposed, the next is decided. (1-VIN/VOUT) x (1/fsw) < Ton peak current = Ipeak /2 + Iave (1-VIN/VOUT) x (1/fsw) > Ton peak current = Ipeak (Example 1) In case of, VIN=6.5V, L=4.7H, fsw=1MHz, VOUT=39V, IOUT=80mA, Efficiency=85% Ipeak = (6.5V / 4.7H) x (1 / 1MHz) x (1-(6.5V / 39V)) =1.08A Iave = (39V x 80mA / 6.0V) / 85% = 0.61A 1/2 Ton = (0.61A x (1-6.0V / 39V) x (1 / 1MHz) x ( 4.7H /6.0V) x 2) = 0.90s (1-VIN/VOUT) x (1/fsw)=0.85s < Ton Peak current = 1.08A/2+0.61A = 1.15A www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 9/26 2011.06 - Rev.C BD6583MUV-A Technical Note (Example 2) In case of, VIN=12.0V, L=4.7H, fsw=1MHz, VOUT=39V, IOUT=80mA, Efficiency=85% Ipeak = (12.0V / 4.7H) x (1 / 1MHz) x (1-(12V / 39V)) =1.77A Iave = (39V x 80mA / 12.0V) / 85% = 0.31A 1/2 Ton = (0.31A x (1-12 V / 39V) x (1 / 1MHz) x ( 4.7H /12 V) x 2) = 0.41s (1-VIN/VOUT) x (1/fsw)=0.69s > Ton Peak current = 12V/4.7H x 0.41s = 1.05A *When too large current is set, output overshoot is caused, be careful enough because it is led to break down of the IC in case of the worst. Operating of the application deficiency 1)When 1 LED or 1parallel OPEN during the operating In case of FAILSEL=L, the LED parallel which became OPEN isn't lighting, but other LED parallel is lighting. At that time, output boosts up to the over voltage protection voltage 44.7V so that LED terminal may be 0V or it boost to the output voltage that LED terminal voltage becomes LED terminal over voltage protection 11.5V or it becomes the output voltage restricted by the over current limit. In case of FAILSEL=H, boost stops when LED becomes OPEN and all LED turns off the lights. 2)When LED short-circuited in the plural In case of FAILSEL=L, all LED is turned on unless LED terminal voltage is LED terminal over voltage protection of more than 11.5V. When it was more than 11.5V only the line which short-circuited is turned on normally and LED current of other lines fall or turn off the lights. In case of FAILSEL=H, boost stops at more than 11.5V and all LED turns off the lights. 3)When Schottky diode came off Regardless of FAILSEL, all LED isn't turned on. Also, IC and a switching transistor aren't destroyed because boost operating stops by the Schottky diode coming off protected function. 4)When over current detection resistor came off Regardless of FAILSEL, all LED isn't turned on. Because the resistance of 100k is between SENSP and SENSN terminal, over current protection works instantly and LED current can't be flow. Control signal input timing VBAT 2.7V 5V 2 Min. 100s 1 RSTB 0V 5V VBAT 3 220 PWMPOW 5V PIN Rin PWMDRV GND VREG DC/DC VOUT Fig.31 Control signal timing Fig.32 Voltage with a control sign higher than VBAT Example corresponding to application of conditions In case you input control signs, such as RSTB, PWMPOW, and PWMDRV, in the condition that the standup of supply voltage (VBAT) is not completed, be careful of the following point. Input each control signal after VBAT exceeds 2.7V. Please do not input each control sign until VBAT exceeds H voltage of RSTB, PWMPOW, and PWMDRV. When you input RSTB during the standup of VBAT and H voltage is inputted into PWMPOW, please give the standup time to stable voltage as Min.100s 2.7V of VBAT. There is no timing limitation at each input signal of RSTB, PWMPOW and PWMDRV. If each control sign changes into a condition lower than VBAT in (1) and (2), it goes via the ESD custody diode by the side of VBAT of each terminal. A power supply is supplied to VBAT and there is a possibility of malfunctioning. Moreover, when the entrance current to the terminal exceeds 50mA, it has possibility to damage the LSI. In order to avoid this condition, as shown in the above figure, please insert about 220 in a signal line, and apply current qualification. Please confirm an internal pull down resistor in the block diagram and electrical property of P.5. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 10/26 2011.06 - Rev.C BD6583MUV-A Technical Note How to select the number of LED lines of the current driver When the number of LED lines of the current driver is reduced, the un-select can be set the matter that the unnecessary LED1 ~ 6 terminal is connected to GND. When it uses with 4 lines and so on, it can correspond to it by connecting 2 unnecessary lines to GND. RSTB is used as a power supply of this decision circuit. The select of the terminal is judged, It has no relation to the logic of PWMPOW and PWMDRV and it isn't judged an unnecessary LED line even if it is connected to GND when it is judged a necessary terminal once. This information can be reset by setting RSTB at 0V. Start control and select LED current driver BD6583MUV-A can control the IC system by RSTB, and IC can power off compulsory by setting 0.2V or below. Also, It powers on PWMPOW is at more than 1.4V and RSTB is at more than 2.25V. When RSTB=PWMPOW=H, ISETH current is selected at PWMDRV=H and ISETL current is selected at PWMDRV=L. The starting current in PWMDRV=L sets OFF second time rise of PWMDRV and it becomes 0mA setting after that. After RSTB sets L once, the starting current can be flowed again by changing it to H. RSTB PWMPOW PWMDRV IC H H H H L L H L H L, H L L H H L, H Off On Off On Off LED current OFF Starting current decided with ISETL OFF Current decided with ISETH OFF Attendance point of the restriction resistance input to RSTB When the restriction resistance is input to RSTB, it is necessary to consider the input current of RSTB. The input current of RSTB changes that depending on the power-supply voltage and the temperature reference to Fig.33. Because the temperature characteristic of the input current is shown in Fig.33, please choose resistance for which the voltage of the terminal can be guaranteed to 2.1V or more. And, it has the margin in the decision of resistance, and please confirm and make sure it is no problem in a real application. The decision example of restriction resistance 1.When use the current driver of 6 parallel 2.9V(to RSTB power-supply) - restriction resistance value x 124A(100 input current) > 2.1V restriction resistance value < (2.9-2.1)/124A=6.45k 2.When use the current driver of 3 parallel 2.9V(to RSTB power-supply) - restriction resistance value x 430A(100 input current) > 2.1V restriction resistance value < (2.9-2.1)/430A=1.86k BD6583MUV-A Power supply for RSTB Limit resistor RSTB terminal RSTB input current[uA] 250 RSTB inflow current +100 +80 +25 200 -30 150 100 50 2.1 2.4 2.7 3 3.3 3.6 RSTB[V] Fig .33 www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. Fig .34 RSTB terminal voltage-RSTB inflow current (At the time of the current driver 6 lines use) 11/26 2011.06 - Rev.C BD6583MUV-A Technical Note In addition, the selection number of parallel number of the current driver is changed, the power-supply current of RSTB will be increased. Because the maximum value of the consumption current at the RSTB=2.1V is indicated in the following Table 1, be careful enough when you calculate the restriction resistance. Table1. The use parallel number of current driver at RSTB=2.1V , 100 vs. RSTB input current Parallel numbers used for current driver RSTB input current 6 0.12mA 5 0.23mA 4 3 2 1 0.33mA 0.43mA 0.53mA 0.63mA 0 0.74mA Start to use PWMPOW terminal for the PWM control, PWM operating After RSTB and PWMDRV is changing L H, input PWM to PWMPOW terminal. There is no constraint in turn of RSTB and PWMDRV. And, because it corresponds to PWM drive of shorter ON time than soft start time (1ms), when PWMPOW is input H more than three times, the soft start is invalidated and it enable to correspond the high-speed drive. Until RSTB is set L, invalidation of the soft start isn't canceled. In case of lighting light off lighting, when it turns off the lights with PWM=L and It starts without soft start when it sets PWM modulated light again. But the peak current of the coil changes owing to discharge of output capacitor, It may flow to the over current limit value, as follows Fig.35. Because soft start can be used when it turns off the lights with RSTB=L, The peak current of the coil can be suppressed, as follows Fig.36 and this process of light off is recommended. RSTB PWMDRV PWMPOW Output Voltage Current coil Fig.35 Light off control of PWMPOW pin at PWM control on PWM=L RSTB PWMDRV PWMPOW Output Voltage Current coil Fig.36 Light off control of PWMPOW pin at PWM control on RSTB=L www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 12/26 2011.06 - Rev.C BD6583MUV-A Technical Note Start to use PWMDRV terminal for the PWM control, PWM operating After RSTB and PWMPOW is changing L H, input PWM to PWMDRV terminal. There is no constraint in turn of RSTB and PWMPOW. When resistance is set as ISET, after RSTB and PWMPOW is changing L H as follows Fig.37, when it is not input PWM to PWMDRV pin but input L, boost of DC/DC is unstable state because current driver doesn't pass current. The starting current is pulled from each LED terminal and pressure up operating is stabilized to escape from this state. Also, the starting current can be set up by the resistance value connected to the ISETL terminal. After starting, as the starting current in PWM brightness control become useless, the starting current is set up 0mA at the second rise time of PWMDRV automatically as follows Fig.37. In case of lighting light off lighting, when it turns off the lights with PWM=L and It starts without soft start because of soft start period was end when it sets PWM modulated light again. But the peak current of the coil changes owing to discharge of output capacitor, It may flow to the over current limit value, as follows Fig.38. Because soft start can be used when it turns off the lights with RSTB=L, The peak current of the coil can be suppressed, as follows Fig.39 and this process of light off is recommended. RSTB PWMPOW L PWMDRV H L H OFF ON OFF L H L Output voltage LED pin ON Current driver of starting current Fig. 37 Off timing of starting current at PWMDRV=L RSTB PWMPOW PWMDRV Output Voltage Current coil Fig.38 Light off control of PWMDRV pin at PWM control on PWM=L RSTB PWMPOW PWMDRV Output Voltage Current coil Fig.39 Light off control of PWMDRV pin at PWM control on RSTB=L www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 13/26 2011.06 - Rev.C BD6583MUV-A Technical Note Brightness control There are two dimming method is available, first method is analog dimming that apply analog voltage to ISET terminal, and second method is PWM control via digital dimming of PWMPOW or PWMDRV. Because each method has the different merit, please choose a suitable method for the application of use. Two techniques can be used as digital dimming by the PWM control One is PWM control of current driver, the other is PWM control of power control. As these two characteristics are shown in the below, selects to PWM control process comply with application. *Efficiency emphasis in the low brightness which has an influence with the battery life *LED current dispersion emphasis in the PWM brightness control 2) Power control PWM control 1) Current driver PWM control (Reference) PWM regulation process Efficiency of LED current 0.5mA (PWM Duty=2.5%) PWM frequency 200Hz Limit dispersion capability of low duty Current driver 70% 0.2% Power control 93% 0.5% 1) Current driver PWM control is controlled by providing PWM signal to PWMDRV, as it is shown Fig.40. The current set up with ISETH is chosen as the H section of PWMDRV and the current is off as the L section. Therefore, the average LED current is increasing in proportion to duty cycle of PWMDRV signal. This method that it lets internal circuit and DC/DC to work, because it becomes to switch the driver, the current tolerance is a few when the PWM brightness is adjusted, it makes it possible to brightness control until 20s (MIN0.4% at 200Hz). And, don't use for the brightness control, because effect of ON/OFF changeover is big under 20s ON time and under 20s OFF time. There is no effect of ON/OFF changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz~10kHz. When resistance is set as ISET, RSTB sets H L, so the starting current may be effective, after RSTB sets L H, it becomes PWM of the starting current and PWM of ISETH setting current to PWM two times. PWMDRV ON OFF LED current ON OFF Coil current ON OFF ON IC's active current Fig.40 2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Fig.41. The current setting set up with PWMDRV logic is chosen as the H section and the current is off as the L section. Therefore, the average LED current is increasing in proportion to duty cycle of PWMPOW signal. This method is, because IC can be power-off at off-time, the consumption current can be suppress, and the high efficiency can be available, so it makes it possible to brightness control until 50s (MIN1% at 200Hz). And, don't use for the brightness control, because effect of power ON/OFF time changeover is big under 50s ON time and under 50s OFF time. There is no effect of ON/OFF changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz~1kHz. Also, PWM can't control RSTB and PWMPOW at the same time. After RSTB sets H, control PWM only PWMPOW. PWMPOW ON OFF LED current ON OFF Coil current ON OFF IC's active current ON OFF Fig.41 www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 14/26 2011.06 - Rev.C BD6583MUV-A Technical Note LED current setting range LED current can set up Normal and Starting setting current. LED current can set up Normal current by resistance value (RISETH) connecting to ISETH voltage and LED current can set Starting current by resistance value (RISETL) connecting to ISETL voltage. Setting of each LED current is given as shown below. Normal current = 20mA(24k/RISETH) Starting constant current = 0.6/RISET L Also, Normal current setting range is 10mA~25mA, Starting current setting range is OFF setting or 1A~100A. LED current can set OFF setting by open setting ISETL pin. LED current becomes a leak current MAX 1A at OFF setting. ISETH Normal current setting example RISETH LED current 24k (E24) 20mA 25.5 k (E96) 18.8mA 27 k (E12) 17.8mA 28k (E96) 17.1mA 30k (E24) 16.0mA 33k (E6) 14.5mA ISETL Starting current setting example RISETL LED current 6.2k (E24) 97A 10k (E6) 60A 47k (E6) 13A 100 k (E6) 6A 560 k (E12) 1.1A Connect to VREG pin 0mA The separations of the IC Power supply and coil Power supply This IC can work in separating the power source in both IC power supply and coil power supply. With this application, it can obtain that decrease of IC power consumption, and the applied voltage exceeds IC rating 22V. That application is shown in below Fig 42. The higher voltage source is applied to the power source of coil that is connected from an adapter etc. Next, the IC power supply is connected with a different coil power supply. Under the conditions for inputting from 2.7V to 5.5V into IC VBAT, please follow the recommend design in Fig 38. It connects VBAT terminal and VREG terminal together at IC outside. When the coil power supply is applied, it is no any problem even though IC power supply is the state of 0V. Although IC power supply is set to 0V, pull-down resistance is arranged for the power off which cuts off the leak route from coil power supply in IC inside, the leak route is cut off. And, there is no power on-off sequence of coil power supply and IC power supply. Coil Power supply 7V to 28V Battery 4.7H 10F 10LED x 6 2.2F RTR020N05 SW FAILSEL SENSP VDET 100m SENSN Power ON/OFF RSTB LED1 PWMDRV LED2 PWMPOW 200Hz PWM LED3 VBAT IC Power supply 2.7V to 5.5V LED4 VREG 1F LED5 GND GND GND GND TEST ISETH ISETL LED6 20mA each 24k Fig.42 Application at the time of power supply isolation www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 15/26 2011.06 - Rev.C BD6583MUV-A Technical Note The coil selection The DC/DC is designed by more than 4.7H. When L value sets to a lower value, it is possibility that the specific sub-harmonic oscillation of current mode DC / DC will be happened. Please do not let L value to 3.3H or below. And, L value increases, the phase margin of DC / DC becomes to zero. Please enlarge the output capacitor value when you increase L value. Example) 4.7H = output capacitor 2.2F/50V 1pcs 6.8H = output capacitor 2.2F/50V 2pcs 10H = output capacitor 2.2F/50V 3pcs This value is just examples, please made sure the final judgment is under an enough evaluation. Layout In order to make the most of the performance of this IC, its layout pattern is very important. Characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully. to Power Supply PWM Reset CIN CBAT to Cathode of LED SBD Tr FAILSEL GND RSTB VREG PWMPOW CREG VBAT L VDET LED6 N.C. LED5 GND LED4 SW GND SENSP LED3 to Anode of each LED LED2 LED1 PWMDRV ISETL ISETH TEST to GND GND RSENSE SENSN COUT RISET Fig. 43 Layout Connect the input bypath capacitor CIN(10F) nearest to coil L, as shown in the upper diagram. Wire the power supply line by the low resistance from CIN to VBAT pin. Thereby, the input voltage ripple of the IC can be reduced. Connect smoothing capacitor CREG of the regulator nearest to between VREG and GND pin, as shown in the upper diagram. Connect schottky barrier diode SBD of the regulator nearest to between coil L and switching transistor Tr. And connect output capacitor COUT nearest to between CIN and GND pin. Thereby, the output voltage ripple of the IC can be reduced. Connect switching transistor Tr nearest to SW pin. Wire coil L and switching transistor Tr, current sensing resistor RSENSE by the low resistance. Wiring to the SENSP pin isn't Tr side, but connect it from RSENSE side. Over current value may become low when wiring from Tr side. Connect RSENSE of GND side isolated to SENS pin. Don't wire between RSENSE and SNESN pin wiring from RSENSE pin to GND pin. And RSENSE GND line must be wired directly to GND pin of output capacitor. It has the possibility that restricts the current drive performance by the influence of the noise when other GND is connected to this GND. Connect LED current setting resistor RISET nearest to ISET pin. There is possibility to oscillate when capacity is added to ISET terminal, so pay attention that capacity isn't added. And, RISET of GND side must be wired directly to GND pin. When those pins are not connected directly near the chip, influence is given to the performance of BD6583MUV-A, and may limit the current drive performance. As for the wire to the inductor, make its resistance component small so as to reduce electric power consumption and increase the entire efficiency. The layout pattern in consideration of these is shown in next page. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 16/26 2011.06 - Rev.C BD6583MUV-A Technical Note Recommended layout pattern BD6583MUV-A CREG RISET CBAT L CIN Tr RSENSE COUT Fig. 44 Frontal surface <Top view> Fig. 45 Rear surface <Top view> www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 17/26 2011.06 - Rev.C BD6583MUV-A Technical Note Selection of external parts Recommended external parts are as shown below. When to use other parts than these, select the following equivalent parts. Coil Value Manufacturer Product number 4.7H 4.7H 4.7H 4.7H 4.7H 10H TOKO TOKO TOKO TDK TDK TDK A915AY-4R7M B1015AS-4R7M A1101AS-4R7M LTF5022T-4R7N2R0 VLP6810T-4R7M1R6 VLP6810T-100M1R1 Vertical 5.2 8.4 4.1 5.0 6.3 6.3 Size Horizontal 5.2 8.3 4.1 5.2 6.8 6.8 Height (MAX) 3.0 4.0 1.2 2.2 1.0 1.0 DC current (mA) DCR () 1870 3300 1400 2000 1600 1100 0.045 0.038 0.115 0.073 0.167 0.350 Capacitor Value Pressure Manufacturer Product number [ Supply voltage capacitor ] 10F 25V MURATA GRM31CB31E106K 10F 10V MURATA GRM219R61A106K 4.7F 25V MURATA GRM319R61E475K 4.7F 25V MURATA GRM21BR61E475K [ Smoothing capacitor for built-in regulator ] 1F 10V MURATA GRM188B10J105K [ Output capacitor ] 1F 50V MURATA GRM31MB31H105K 1F 50V MURATA GRM21BB31H105K 2.2F 50V MURATA GRM31CB31H225K 0.33F 50V MURATA GRM219B31H334K Vertical Size Horizontal Height 3.2 2.0 3.2 2.0 1.6 1.25 1.6 1.25 1.6 3.2 2.0 3.2 2.0 TC Cap Tolerance 1.60.2 0.850.15 0.850.1 1.250.1 B X5R X5R X5R +/-10% +/-10% +/-10% +/-10% 0.8 0.80.1 B +/-10% 1.6 1.25 1.6 1.25 1.150.1 1.250.1 1.60.2 0.850.1 B B B B +/-10% +/-10% +/-10% +/-10% Resistor Value Tolerance Manufacturer Product number [ Resistor for LED current decision <ISETH pin> ] 30k 0.5% ROHM MCR006YZPD3002 [ Resistor for over current decision <SENSP pin> ] 100m 1% ROHM MCR10EZHFLR100 Vertical Size Horizontal Height 0.6 0.3 0.23 2.0 1.25 0.55 Vertical 3.5 Size Horizontal 1.6 Height 0.8 Vertical 2.8 6.0 Size Horizontal 2.9 5.0 Height 1.0 1.75 SBD Pressure Manufacturer Product number 60V ROHM RB160M-60 Pressure Manufacturer Product number 45V 60V ROHM ROHM RTR020N05 RSH065N06 MOS FET Nch Current ability Driving voltage 2A 6.5A 2.5V 4.0V The coil is the part that is most influential to efficiency. Select the coil whose direct current resistor (DCR) and current inductance characteristic is excellent. BD6583MUV-A is designed for the inductance value of 4.7H. Don't uses the inductance value less than 2.2H. Select a capacitor of ceramic type with excellent frequency and temperature characteristics. Further, select Capacitor to be used with small direct current resistance, and pay sufficient attention to the layout pattern shown in P.16. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 18/26 2011.06 - Rev.C BD6583MUV-A Technical Note Attention point of board layout In board pattern design, the wiring of power supply line should be low Impedance, and put the bypass capacitor if necessary. Especially the wiring impedance must be lower around the DC/DC converter. About heat loss In heat design, operate the DC/DC converter in the following condition. (The following temperature is a guarantee temperature, so consider the margin.) 1. Periphery temperature Ta must be less than 85 . 2. The loss of IC must be less than dissipation Pd. Application example LED current setting controlled ISETH resistor. 24k : 20mA 30k : 16mA 19.6k : 24.5mA 33k : 14.5mA Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.12). 15inch panel Battery 4.7H 10F 10LED x 6 parallel 2.2F * RTR020N05 SW FAILSEL SENSP VDET 47m SENSN Power ON/OFF RSTB LED1 PWMPOW LED2 PWMDRV 100Hz~10kHz PWM LED3 VBAT LED4 VREG 1F LED5 GND GND GND GND TEST ISETH ISETL LED6 Each 20mA 24k Can be set up to each 10 ~25mA Fig.46 10 seriesx6 parallel, LED current 20mA setting Current driver PWM application 13~14inch panel Battery Battery 4.7H 10F 8LED x 6 parallel 4.7H 10F 2.2F * RTR020N05 SW 8LED x 6 parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 51m VDET 51m SENSN Power ON/OFF SENSN Power ON/OFF RSTB LED1 PWMPOW 100Hz~1kHz PWM 1F LED3 VBAT LED4 VREG 1F GND GND GND GND TEST ISETH ISETL LED6 Each 20mA LED5 GND GND GND GND TEST ISETH ISETL LED6 24k Can be set up to each 10~25mA Each 20mA Can be set up to each 10~25mA Fig.47 8 seriesx parallel, LED current 20mA setting Power control PWM application www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. LED4 VREG LED5 24k LED2 PWMDRV 100Hz~10kHz PWM LED3 VBAT LED1 PWMPOW LED2 PWMDRV RSTB Fig.48 8 seriesx6 parallel, LED current 20mA setting Current driver PWM application 19/26 2011.06 - Rev.C BD6583MUV-A Technical Note Application example LED current setting controlled ISETH resistor. 24k : 20mA 30k : 16mA 19.6k : 24.5mA 33k : 14.5mA Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.12). 10~12inch panel Battery Battery 4.7H 10F 7LED x 6 parallel 4.7H 10F 2.2F * RTR020N05 SW 10LED x4 parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 56m VDET 56m SENSN Power ON/OFF SENSN Power ON/OFF RSTB 1F LED3 VBAT LED4 VREG LED4 VREG LED5 1F GND GND GND GND TEST ISETH ISETL LED6 LED5 GND GND GND GND TEST ISETH ISETL LED6 Each 16mA 30k LED2 PWMDRV 100Hz~10kHz PWM LED3 VBAT LED1 PWMPOW LED2 PWMDRV 100Hz~10kHz PWM RSTB LED1 PWMPOW Fig.49 7 seriesx6 parallel, LED current 16mA setting Current driver PWM application Each 20mA 24k Can be set up to each 10~25mA Can be set up to each 10~25mA Fig.50 10 seriesx4 parallel, LED current 20mA setting Current driver PWM application 7inch panel Battery Battery 4.7H 10F 8LED x 3 parallel 4.7H 10F 2.2F * RTR020N05 SW 6LED x 4 parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 68m VDET 68m SENSN Power ON/OFF SENSN Power ON/OFF RSTB LED1 PWMPOW LED2 PWMDRV 100Hz~10kHz PWM 1F LED3 1F GND GND GND GND TEST ISETH ISETL LED6 Each 20mA LED5 GND GND GND GND TEST ISETH ISETL LED6 24k Can be set up to each 10~25mA Each 20mA Can be set up to each 10~25mA Fig.51 8 seriesx3 parallel, LED current 20mA setting Current driver PWM application www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. LED4 VREG LED5 24k LED2 VBAT LED4 VREG LED1 PWMDRV 100Hz~10kHz PWM LED3 VBAT RSTB PWMPOW Fig.52 6 seriesx4 parallel, LED current 20mA setting Current driver PWM application 20/26 2011.06 - Rev.C BD6583MUV-A Technical Note Application example LED current setting controlled ISETH resistor. 24k : 20mA 30k : 16mA 19.6k : 24.5mA 33k : 14.5mA Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.12). 7inch panel Battery Battery 4.7H 10F 4LED x 6 parallel 4.7H 10F 2.2F * RTR020N05 SW 8LED x 3 parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 68m VDET 68m SENSN Power ON/OFF SENSN Power ON/OFF RSTB LED1 PWMPOW 100Hz~1kHz PWM LED2 PWMDRV RSTB LED1 PWMPOW 100Hz~1kHz PWM LED2 PWMDRV LED3 VBAT VREG 1F LED3 VBAT LED4 1F GND GND GND GND TEST ISETH ISETL LED6 LED5 GND GND GND GND TEST ISETH ISETL LED6 Each 20mA 24k LED4 VREG LED5 Each 40mA 24k Can be set up to each 10~25mA Can be set up to each 20~50mA Fig.53 4 seriesx6 parallel, LED current 20mA setting Power control PWM application Fig.54 8 seriesx3 parallel, LED current 40mA setting Power control PWM application 5inch panel Battery Battery 4.7H 10F 8LED x 2 parallel 4.7H 10F 2.2F * RTR020N05 SW 8LED x 2 parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 82m VDET 82m SENSN Power ON/OFF SENSN Power ON/OFF RSTB LED1 PWMPOW LED2 PWMDRV 100Hz~10kHz PWM RSTB LED1 PWMPOW 100Hz~1kHz PWM LED2 PWMDRV LED3 VBAT VREG 1F LED3 VBAT LED4 1F GND GND GND GND TEST ISETH ISETL LED6 24k Each 20mA LED5 GND GND GND GND TEST ISETH ISETL LED6 24k Can be set up to each 10~25mA Each 40mA Can be set up to each 20~50mA Fig.55 8 seriesx2 parallel, LED current 20mA setting Current driver PWM application www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. LED4 VREG LED5 Fig.56 8 seriesx2 parallel, LED current 40mA setting Power control PWM application 21/26 2011.06 - Rev.C BD6583MUV-A Technical Note Application example LED current setting controlled ISETH resistor. 24k : 20mA 30k : 16mA 19.6k : 24.5mA 33k : 14.5mA Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.12). 5inch panel Battery Battery 4.7H 10F 4LED x 4 parallel 4.7H 10F 2.2F * RTR020N05 SW 8LED x 2 parallel 2.2F * FAILSEL SENSP RTR020N05 SW VDET FAILSEL SENSP 82m VDET 82m SENSN Power ON/OFF SENSN Power ON/OFF RSTB LED1 PWMPOW LED2 PWMDRV 100Hz~10kHz PWM LED3 LED4 VREG LED5 1F GND GND GND GND TEST ISETH ISETL LED6 Each 20mA 24k LED2 VBAT LED4 VREG 1F LED1 PWMDRV 100Hz~10kHz PWM LED3 VBAT RSTB PWMPOW LED5 GND GND GND GND TEST ISETH ISETL LED6 24k Can be set up to each 10~25mA Each 60mA Can be set up to each 30~75mA Fig.57 4 seriesx4 parallel, LED current 20mA setting Current driver PWM application Fig.58 8 seriesx2 parallel, LED current 60mA setting Current driver PWM application Battery 4.7H 10F 3LED x 5 parallel 2.2F * RTR020N05 SW FAILSEL SENSP VDET 82m SENSN Power ON/OFF RSTB LED1 PWMPOW 100Hz~1kHz PWM LED2 PWMDRV LED3 VBAT LED4 VREG 1F LED5 GND GND GND GND TEST ISETH ISETL LED6 Each 20mA 24k Can be set up to each 10~25mA Fig.59 3 seriesx5 parallel, LED current 20mA setting Power control PWM application www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 22/26 2011.06 - Rev.C BD6583MUV-A Technical Note Application example LED current setting controlled ISETH resistor. 24k : 20mA 30k : 16mA 19.6k : 24.5mA 33k : 14.5mA Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.12). For the application of 22V and more For big current LED Coil power supply 6~30V Battery Battery 4.7H 10F 4.7H 10F 8LED x 1 parallel 8LED x 6 parallel 2.2F * 2.2F * RTR020N05 RTR020N05 SW FAILSEL SENSP SW FAILSEL SENSP VDET VDET 82m 51m SENSN SENSN Power ON/OFF Power ON/OFF RSTB PWMPOW VBAT 1F LED2 LED3 VBAT LED4 LED4 VREG 1F LED1 PWMDRV 100Hz~10kHz PWM LED3 2.7~22V IC power supply LED2 PWMDRV 200Hz PW M RSTB PWMPOW LED1 VREG LED5 1F GND GND GND GND TEST ISETH ISETL LED6 GND GND GND GND TEST ISETH ISETL LED6 Each 20mA 24k LED5 24k 120mA Can be set up to 60~150mA Can be set up to each 10~25mA Fig.60 Fig.61 The separation of less than an IC power supply 5V and the coil power supply Coil power supply 6~30V Battery 4.7H 10F 10LED x 6 parallel 2.2F * RTR020N05 SW FAILSEL SENSP VDET 51m SENSN Power ON/OFF RSTB LED1 PWMPOW LED3 VBAT 2.7~5.5V IC power supply LED2 PWMDRV 200Hz PW M 1F 1F LED4 VREG LED5 GND GND GND GND TEST ISETH ISETL LED6 24k Each 20mA Can be set up to each 10~25mA Fig.62 www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 23/26 2011.06 - Rev.C BD6583MUV-A Technical Note Application example of Analog dimming Control LED current to charged D/A voltage. Show application example and typ control. Please decide final value after you evaluated application, characteristic. Battery 4.7H 10F 8LED x 6 parallel 2.2F * RTR020N05 SW FAILSEL SENSP VDET 51m SENSN Power ON/OFF RSTB LED1 PWMPOW LED2 PWMDRV D/A 0.05V 0.2V 0.4V 0.5V 0.6V 0.7V LED current 19.4mA 14.4mA 7.7mA 4.4mA 1.0mA 0mA LED3 VBAT LED4 VREG 1F LED current = LED5 GND GND GND GND TEST ISETH ISETL LED6 ISET voltage ISET voltage -D/A + x800 470k 24k Each 20mA 470k 24k typ LED current = 0.6V 470k + 0.6V-D/A 24k x800 D/A Fig.63 Analog style optical application Notes for use (1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) Operating conditions These conditions represent a range within which characteristics can be provided approximately as expected. The electrical characteristics are guaranteed under the conditions of each parameter. (3) Reverse connection of power supply connector The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the IC's power supply terminal. (4) Power supply line Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. For the GND line, give consideration to design the patterns in a similar manner. Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient. (6) Short circuit between terminals and erroneous mounting In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the ICs can break down. (7) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 24/26 2011.06 - Rev.C BD6583MUV-A Technical Note (8) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB. (9) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) Ground wiring pattern If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well. (11) External capacitor In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc. (12) Thermal shutdown circuit (TSD) When junction temperatures become 175C (typ) or higher, the thermal shutdown circuit operates and turns a switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much as possible, is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the LSI with this circuit operating or use the LSI assuming its operation. (13) Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in actual states of use. (14) Selection of coil Select the low DCR inductors to decrease power loss for DC/DC converter. www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. 25/26 2011.06 - Rev.C BD6583MUV-A Technical Note Ordering part number B D 6 Part No. 5 8 3 Part No. 6583 M U V - Package MUV= VQFN024V4040 A E 2 Packaging and forming specification E2: Embossed tape and reel VQFN024V4040 <Tape and Reel information> 4.00.1 4.00.1 1.0MAX 2.40.1 0.40.1 7 12 19 18 0.5 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 6 24 0.75 E2 2.40.1 1 2500pcs (0.22) +0.03 0.02 -0.02 S C0.2 Embossed carrier tape Quantity Direction of feed 1PIN MARK 0.08 S Tape 13 +0.05 0.25 -0.04 1pin (Unit : mm) www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. Reel 26/26 Direction of feed Order quantity needs to be multiple of the minimum quantity. 2011.06 - Rev.C Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. 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Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com (c) 2011 ROHM Co., Ltd. All rights reserved. R1120A