AL5812 60V, 150mA ADJUSTABLE LINEAR LED DRIVER Description Pin Assignments (Top View) The AL5812 is an adjustable Linear LED driver offering excellent temperature stability and output handling capability. The AL5812 simplifies the design of linear and isolated or non-isolated LED drivers by setting the LED current with standard value resistors. The AL5812 has an open drain output that can swing from 1V up to VCC 1 8 LED NC 2 7 NC NC 3 6 NC RSET 4 60V enabling it drive long LED chains. Its low 0.5V RSET pin is outside of the LED current path and so accuracy is maintained while MSOP-8EP minimizing the required overheads to regulate the LED current. This reduces its power dissipation when compared to traditional linear LED drivers. 5 GND (Top View) This makes it ideal for driving LEDs up to 150mA VCC 1 (commonly referred to as 1/2W LEDs). 6 LED Longer LED chains can be driven by tapping VCC from the chain, 5 NC NC 2 where the chain voltage may exceed 60V. The AL5812 is available in the exposed pad MSOP-8EP and RSET 3 U-DFN3030-6 packages. Exposed Pad 4 GND U-DFN3030-6 Features Applications Low Reference Voltage (VRSET = 0.5V) Isolated Offline LED Converters -40C to +125C Temperature Range Linear LED Driver 3% LED Current Tolerance LED Signs Low Temperature Drift Instrumentation Illumination 1V to 60V Open-Drain Output High Power Supply Rejection MSOP-8EP and U-DFN3030-6 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit AL5812 Document number: DS35616 Rev. 4 - 2 1 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Pin Descriptions Pin Name Pin Number (MSOP8-EP) Pin Number (U-DFN3030-6) VCC 1 1 RSET 4 3 GND LED NC 5 8 2, 3, 6, 7 4 6 2, 5 EP EP EP Function Power Supply Input. Connect a 0.1F ceramic capacitor between VCC and GND as close as possible to the device. LED Current Setting Pin. Connect a resistor from this pin to GND: ILED = 750/RSET May also be used to provide PWM dimming functionality. Ground Reference Point of Device. LED Current Sink Output. No Connection. Exposed Pad (bottom). Used to improve thermal impedance of package. It must be connected to GND directly underneath the package but not used as sole GND potential terminal. Functional Block Diagram AL5812 Document number: DS35616 Rev. 4 - 2 2 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Absolute Maximum Ratings (@TA = +25C, unless otherwise specified.) Symbol VCC VLED VRSET ILED ESD HBM ESD CDM TJ TST Parameters Supply Voltage Relative to GND Pin (Note 4) LED Pin Voltage Relative to GND Pin (Note 4) RSET Pin Voltage Relative to GND Pin LED Pin Current Sink Current Range Human Body Model ESD Protection Charged Device Model ESD Protection Operating Junction Temperature Storage Temperature Ratings -0.3 to +66 -0.3 to +66 -0.3 to +6 165 1 1.2 -40 to +150 -55 to +150 Unit V V V mA kV kV C C Note: 4.VCC pin can be greater or smaller than VLED; neither should go below GND. Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Package Thermal Data Package JC Thermal Resistance Junction-to-Case (Note 7) MSOP-8EP U-DFN3030-6 39 14 Notes: JA Thermal Resistance Junction-to-Ambient (Note 7) 90C/W (Note 5) 69C/W (Note 6) PDIS TA = +25C, TJ = +125C (Note 7) 1.1W 1.47W 5. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed. 6. Test condition for U-DFN3030-6: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed 7. Dominant conduction path via exposed pad. Recommended Operating Conditions (@TA = +25C, unless otherwise specified.) Symbol VCC VLED ILED TA Notes: Parameter Supply Voltage Range Relative to GND Pin LED Pin Output Voltage Range Relative to GND Pin LED Pin Current (Notes 8 & 9) Operating Ambient Temperature Range Min 3.5 1 10 -40 Max 60 60 150 +125 Unit V mA C 8. For improved accuracy LED current should be greater than 60mA. 9. Maximum LED current is also limited by ambient temperature and power dissipation such that junction temperature should be kept less than or equal to +125C. AL5812 Document number: DS35616 Rev. 4 - 2 3 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Electrical Characteristics (@TA = +25C, VCC= 3.5V, VLED=1V (Note 10), RSET = 7.5k unless otherwise specified.) Symbol VRSET Parameter RSET Voltage Conditions -- Min Typ Max Unit -- 0.5 -- V 57 60 63 142.5 150 157.5 97 100 103 TA = -40C to +125C 95 -- 105 TA = -40C to +125C RSET = 12.5k ILED ILED Current Accuracy TA = +25C RSET = 4.99k RSET = 7.5k REGLINE UVLO ICC ILEAK mA LED Current Line Regulation VCC = 3.5V to 60V TA = +25C -- 0.25 -- % Under Voltage Lockout -- TA = -40C to +125C -- 2 -- V TA = +25C -- 320 400 TA = -40C to +125C -- -- 500 TA = +125C -- -- 1 Supply Current 3.5V VCC 60V LED Pin Leakage Current VCC = VLED = 60V RSET = Open Circuit A A TSHDN Thermal Shutdown -- -- -- 155 -- C THYS Thermal Shutdown Hysteresis -- -- -- 20 -- C Note: 10. All voltages unless otherwise stated are measured with respect to GND pin. AL5812 Document number: DS35616 Rev. 4 - 2 4 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Typical Performance Characteristics 145 160 120 LED CURRENT (mA) 120 LED CURRENT (mA) RSET = 4.99k 140 RSET = 4.99k 140 100 RSET = 7.5k 80 60 RSET = 12.4k 100 RSET = 7.5k 80 60 RSET = 12.4k 40 40 0 0 5 VLED = 1.2V VCC = 3.5V 20 VLED = 1.2V TA = +25C 20 0 -40 -25 -10 20 35 50 65 80 95 110 125 TEMPERATURE (C) Figure 2 LED Current vs. Ambient Temperature 10 15 20 25 30 35 40 45 50 55 60 INPUT VOLTAGE (V) Figure 1 LED Current vs. Input Voltage 160 VIN = 3.5V TA = +25C RSET = 4.99k 5 RSET = 4.99k 140 VIN = 3.5V TA = +25C LED CURRENT (mA) LED CURRENT (mA) 120 RSET = 7.5k RSET = 12.4k 100 RSET = 7.5k 80 60 RSET = 12.4k 40 20 0 0 0 5 10 15 20 25 30 LED VOLTAGE (V) Figure 3 LED Current vs. LED Pin Voltage (Note 11) 160 R SET = 4.99k 140 140 120 120 R SET = 7.5k 100 80 60 RSET = 12.4k 40 0 RSET = 4.99k 100 RSET = 7.5k 80 60 RSET = 12.4k 40 TA = +25C 2 LEDs 20 Notes: 1.0 1.5 2.0 2.5 3.0 LED VOLTAGE (V) Figure 4 LED Current vs. LED Pin Voltage Zoomed LED CURRENT (mA) LED CURRENT (mA) 160 0.5 TA = +25C VCC pin tied to LED pin 2 LEDs 20 0 5 10 15 20 25 30 35 40 45 INPUT VOLTAGE (V) Figure 5 LED Current vs. Input Voltage - 2 LEDs (Note 11 & 12) 0 0 2 4 6 8 10 12 14 16 18 20 22 INPUT VOLTAGE (V) Figure 6 LED Current vs. Input Voltage 2 LEDs - High Side Drive (Notes 11, 12 &13) 11. These curves have been limited at larger input voltages due to power dissipation. 12. Lower input voltage range is limited by the LED chain voltage 13. The AL5812 has its VCC pin connected to its LED pin, which are connected to the positive input supply voltage. RSET is connected to AL5812 GND pin, which is connected to the anode of the LED chain. This creates a high side driver of the LED chain. See Figure 15. AL5812 Document number: DS35616 Rev. 4 - 2 5 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Typical Performance Characteristics (cont.) 14 110 TA = +25C 2 LEDs RSET = 7.5k fPWM = 100Hz 100 80 70 60 50 40 THYS 10 8 6 4 30 2 20 0 10 0 TSHDN R SET = 75K 12 LED CURRENT (mA) LED CURRENT (mA) 90 V IN = 9V 0 10 20 -2 125 30 40 50 60 70 80 90 100 DUTY CYCLE (%) Figure 7 LED Current vs. PWM Duty Cycle 0.500 130 135 140 145 150 155 TEMPERATURE (C) Figure 8 LED Current vs. TSHDN 0.500 VLED = 1.2V TA = +25C VLED = 1.2V VIN = 3.5V 0.495 0.495 RSET VOLTAGE (V) RSET VOLTAGE (V) 160 0.490 0.485 0.490 RSET = 7.5k 0.485 RSET = 7.5k 0.480 0.480 0.475 0 5 0.475 -40 -25 -10 10 15 20 25 30 35 40 45 50 55 60 INPUT VOLTAGE (V) Figure 9 RSET Voltage vs. Input Voltage 20 35 50 65 80 95 110 125 TEMPERATURE (C) Figure 10 RSET Voltage vs. Ambient Temperature 350 400 300 RSET = 4.99k 300 250 SUPPLY CURRENT (A) SUPPLY CURRENT (A) 350 RSET = 7.5k 200 RSET = 12.4k 150 100 0 RSET = 7.5k 200 RSET = 12.4k 150 100 10 15 20 25 30 35 40 45 50 55 60 INPUT VOLTAGE (V) Figure 11 Supply Current vs. Input Voltage Document number: DS35616 Rev. 4 - 2 VLED = 1.2V VIN = 3.5V 50 5 AL5812 R SET = 4.99k 250 VLED = 1.2V T A = +25C 50 0 5 6 of 13 www.diodes.com 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) Figure 12 Supply Current vs. Ambient Temperature March 2014 (c) Diodes Incorporated AL5812 Application Information Description The AL5812 is a Linear LED driver and in normal operation has the LEDs connected to the same potential as its VCC pin and regulates the LED current by sinking current into to its LED pin see Figure 13. The LED current is set by the use of an external resistor, RSET, connected from the RSET pin to GND. This resistor supplies the bias current of the AL5812 together with current regulator to set the LED current. The nominal LED current is determined by this equation: ILED 1500 * 0.5 R SET where 1500 is the current ratio between the LED pin current and RSET pin current. With RSET = 7.5k ILED 1500 * 0 .5 100mA 7.5k The AL5812 with its 60V capability on its supply pin, VCC, and its LED drive pin allows it to operate from supply rails up to 60V and/or directly drive LED chains up to 60V as shown in Figures 13 and 14. The voltage applied to the VCC pin can be greater or lower than the voltage applied to the LED string. Figure 14 shows where you might control it from a 5-V rail but power the rails from a 12V rail. VLED VIN VCC CIN 0.1F LED AL5812 RSET GND RSET = 4.99k Figure 14 Low Side Drive - Separate Supplies Figure 13 Low Side Current LED Setting AL5812 Document number: DS35616 Rev. 4 - 2 7 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Application Information (cont.) High Voltage Operation An extension of Figure 14 is to derive the power for the AL5812 from the LED chain itself see Figure 15. LED chains greater than 60V can be driven in this manner as long PWM dimming is not utilized. Figure 16 High Side Current LED String Figure 15 Low Side LED String Tapping Figure 15 shows the use of RC delay to match the power time delay between Vcc and LED pin. The AL5812 can also be used on the high side of the LEDs, see Figure 16. This is a simple way of extending the maximum LED chain voltage, however, it does increase the minimum system input voltage to: Where VIN(min) = VLED_CHAIN + 3.5V. VLED_CHAIN is the LED chain voltage. AL5812 Document number: DS35616 Rev. 4 - 2 8 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Application Information (cont.) PWM Dimming The AL5812 can be used to provide LED current dimming driving the RSET pin via the current setting resistor (RSET) and a series MOSFET switch to ground (Figure 17). The RSET pin current is then effectively switched on and off causing the LED current to turn on and off. The linearity is shown in Figure 18. 110 TA = +25C 2 LEDs RSET = 7.5k fPWM = 500Hz 100 LED CURRENT (mA) 90 80 70 60 50 40 30 20 10 0 Figure 17 PWM Dimming 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE (%) Figure 18 PWM Dimming Linearity Thermal Considerations When designing linear LED drivers careful consideration must be given to: 1. the power dissipation within the LED driver and 2. PCB layout/heat sinking. A Linear LED driver has to be able to handle the large potential input voltage variations due to the supply voltage tolerance and also the variation in LED forward voltage due to binning and temperature. This can result in a large potential difference across the LED driver resulting in a larger than anticipated power dissipation. For example in an 12V powered system with a 5% output voltage tolerance; the input voltage could typically vary from 12.6V down to 11.4V driving 3 LEDs with a voltage varying from 3V to 3.5V at 100mA. This means that the LED driver has to cope with a voltage drop across varying from approximately 3.6V to 0.9V. This means that the power dissipation of the AL5812 could be as much as 366mW. Figure 19 below shows how the AL5812's power dissipation capability varies with package; these values will vary with PCB size and area of metal associated with the ground plane used for heat sinking. By increasing the area on the top layer the thermal impedance of both packages could be improved. 1.6 POWER DISSIPATION (W) 1.4 U-DFN3030-6 1.2 1.0 MSOP-8EP 0.8 0.6 0.4 0.2 0.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 AMBIENT TEMPERATURE (C) Figure 19 Power Dissipation Derating AL5812 Document number: DS35616 Rev. 4 - 2 9 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Ordering Information AL5812 XX - XX Package Packing FF : U-DFN3030-6 7 : 7" Tape & Reel MP : MSOP-8EP 13 : 13" Tape & Reel Device Package Code Packaging AL5812MP-13 AL5812FF-7 MP FF MSOP-8EP U-DFN3030-6 7"/13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 3000/Tape & Reel -7 Marking Information (1) MSOP-8EP (Top View) 8 7 Logo 6 5 YW X E Part Number AL5812 1 2 3 A~Z : Green MSOP-8EP Y : Year : 0~9 W : Week: A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week 4 (2) U-DFN3030-6 ( Top View ) XX YW X Part Number AL5812FF-7 AL5812 Document number: DS35616 Rev. 4 - 2 XX : Identification Code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Package U-DFN3030-6 10 of 13 www.diodes.com Identification Code B9 March 2014 (c) Diodes Incorporated AL5812 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) MSOP-8EP D 4X 10 x E 0.25 D1 E2 Gauge Plane Seating Plane a y 1 4X 10 8Xb e Detail C E3 A1 A3 c A2 A D L E1 See Detail C MSOP-8EP Dim Min Max Typ A 1.10 A1 0.05 0.15 0.10 A2 0.75 0.95 0.86 A3 0.29 0.49 0.39 b 0.22 0.38 0.30 c 0.08 0.23 0.15 D 2.90 3.10 3.00 D1 1.60 2.00 1.80 E 4.70 5.10 4.90 E1 2.90 3.10 3.00 E2 1.30 1.70 1.50 E3 2.85 3.05 2.95 e 0.65 L 0.40 0.80 0.60 a 0 8 4 x 0.750 y 0.750 All Dimensions in mm (2) U-DFN3030-6 3 A 1 A A e n a l P g n i t a e S 2 D D U-DFN3030-6 Dim Min Max Typ A 0.57 0.63 0.60 A1 0 0.05 0.02 A3 0.15 b 0.35 0.45 0.40 D 2.95 3.05 3.00 D2 2.25 2.45 2.35 E 2.95 3.05 3.00 E2 1.48 1.68 1.58 e 0.95 L 0.35 0.45 0.40 Z 0.35 All Dimensions in mm D I 1 # n i P 5 3 . 0 * 5 3 . 0 5 4 L 2 E E e AL5812 Document number: DS35616 Rev. 4 - 2 b x 4 Z 11 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for latest version. (1) MSOP-8EP X C Dimensions Y G Y2 C G X X1 Y Y1 Y2 Y1 X1 Value (in mm) 0.650 0.450 0.450 2.000 1.350 1.700 5.300 (2) U-DFN3030-6 2 1 X X C Dimensions 2 Y 1 Y 9 0 4 . 0 C Document number: DS35616 Rev. 4 - 2 Y X AL5812 C X X1 X2 Y Y1 Y2 Value (in mm) 0.950 0.500 2.400 2.550 0.600 1.780 3.300 12 of 13 www.diodes.com March 2014 (c) Diodes Incorporated AL5812 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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