MITSUBISHI <CONTROL / DRIVER IC> M56784FP DESCRIPTION The M56784FP is a semiconductor integrated circuit in order to drive the spindle motor. FEATURES @ Large power dissipation (Power Package). @ 3.3V DSP available. @ The supply voltage with wide range. @ High motor drive current. @ Low saturation voltage. (typical 1.2V at load current 500mA) @ Motor current control for both motor torque directions. @ Reverse torque mode select [SHORT BRAKING, etc]. @ Sleep mode. (Zero total current) @ Hall amplifier sensitivity select. (Minimum voltage: 35mVp-p or 50mVp-p) @ FG signal output terminal. @ Automatic stop select. (Removable function) @ Reverse detected signal pin. APPLICATION CD-ROM, DVD, DVD-ROM, DVD-RAM etc. SPINDLE MOTOR DRIVER PIN CONFIGURATION (TOP VIEW) xe [FIO 42] NC w [2] ai} sis v [By 40] Ros u [4] 38] FG Rs 5 38) Cc moves [6 37] | MODE2 MODE4 [7 [36] Moves | 6 34 zs g 8 GND a 32] GND fk v. 6 30 mS 29 Hw [15] 28] vu Hwe [16 27] Voe2 He [17] 26] EC Hee [1 25] ECR Hu [19] 24] vect Hue [20] 23] HB nc [24 22] NC Outline 42P9R-D N.C: no connection BLOCK DIAGRAM Uu Vv sis Vect --@---@)- @Q----- | Vee2 Vref ao MOOE1 (38) a | GND BRAKING Converter > MODE | CHANGE MODE2 (37) 120 MATRIX GND MODE4 SENSE VA Converter | MODE3 FG FG RDS RDS Hue Hvt Hy. 19) -C2a(7) C88) -@) Hw+ Gs) a EC ECR Hw- HB ar MW 2498eb 0027340 259MITSUBISHI <CONTROL / DRIVER IC> M56784FP SPINDLE MOTOR DRIVER PIN DESCRIPTION Pin No. Symbol . Function N.C . _ Ww Motor drive Bias for Hall Sensor Vv U Motor drive Automatic Hw- mode select 1 Hw+ mode select 2 Hv- Hyv- Hv+ Sensor Hu- Hu- Sensor N.C N.C *Pull-up resistors (10kohm) are included in the circuits connected to @ pin[RDS] and pin[FG]. ABSOLUTE MAXIMUM RATING (Ta = 25C) Symbol Parameter Conditions Rating VM 16 Vec2 16 5V lo current 1.5 Sensor amp. Differential 45 Pt Power 1.2 Ke Thermal 9.6 Junction 150 T -20-+ T: -40 - +125 *Note1. The ICs must be operated within the Pt (power dissipation) or the area of safety operation. Mi 6249626 0027341 125MITSUBISHI <CONTROL / DRIVER IC> M56784FP RECOMMENDED OPERATING CONDITIONS SPINDLE MOTOR DRIVER Symbol Parameter Min. = Max. Units Vec1 5V Power supply 45 5.0 5.5 Vv Vec2 12V Power supply 45 12.0 13.2 v VM Motor Power supply 45 12.0 13.2 Vv lo Output drive current _ _ 700 mA ELECTRICAL CHARACTERISTICS (Vcc=5V, Vcc2=12V ,VM=12V, Ta=25C unless otherwise noted.) Symbol Paramet Conditi Limits Units ym arameter inditions Min. Typ. Max ni {cc1 Steep Mode Supply current-1| @and @ pin total Input Current . _ 0 100 HA (@ pin low or open) tcc2 Sleep Mode Supply current- 2} @ pin Input Current (@ pin low or open) _ 500 LA iec3 Supply current - 3 @ pin Input Current (EC = ECR = 2.5V) oo. - _ 6.0 mA [@ pin High] . Top and Bottom saturation voltage _ Vsat Saturation voltage (Load current: 500mA) 1.2 1.9 Vv ECdead- EC <ECR -40 -21 0 EGdead+ Control voltage dead zone EC> ECR 0 721 +40 mv ECR Reference voltage Input range| pin (3.3V DSP available] 0.5 1.65 4.0 Vv EC Control voltage Input range @ pin [3.3V DSP available] 0.5 1.65 4.0 Vv Gio Control gain lo = Gio / Rsense [A/V] 0.25 0.3 0.35 VN Viim Control limit llim = Viim / Rsense [A] 0,27 0.3 0.33 Vv Hall senser amp. common . VH com mode input range @-@pins 1.2 - 4.5 Vv VHmin1 | Hall sensor amp. @ . MODE4 = OPEN or HIGH 50 _ _ v VHmin2 | input signal revel ~@pins MODE4 = GND 35 = | Pe VHb Hall bias terminal output Load current (!Hb) 10mA. 0.6 0.85 4.2 V voltage IHb Halil bias terminal sink current - _ 30 mA @pin input voltage when it starts up the motor. Von Motor start voltage *The IC is in the active condition. 2.0 - _ v *The hall bias is available. @pin input voltage when it stops the motor. Voff Motor stop voltage *The IC is in the sleep condition. _ 0.8 Vv *The hail bias is off. pin [MODE1}, @pin [MODE2], pin [MODE3] Vir Mode pin input high voltage and @pin [MODE4] input voltage 2.0 - _ Vv when they are HIGH. pin [MODE1], Mpin [MODE2], pin [MODE3] Vit Mode pin input low voltage and @ pin [MODE4] input voltage _ - 0.8 Vv when they are LOW. @pin[RDS}, @ pin[FG] = _ _ VoL output low voltage lo current = mA 0.5 v MH b2458eb OOer3ake OblELECTRICAL CHARACTERISTICS (Vcc1=5V, Vec2=12V, VM=12V, Ta=25C Unless otherwise noted.) Current limit -> 0-+40mV > EC-ECR ae 0--40mvV <* Current limit Forward Torque MITSUBISHI <CONTROL / ORIVER IC> M56784FP SPINDLE MOTOR DRIVER The relationship between the EC-ECR (the difference between EC (<control voltage> and ECR <reference voltage>) and the torque is shown in Figure 1. The current gain is 0.6A/V (at sensing resistor: 0.50hm) in both torque directions, and the dead zone is from +OmV to +40mvV. When the all short brake mode is selected, the coil current under the reverse torque control depends on the back emf. and the coil resistance. Figure 1. The characteristics of the control voltage and motor current (Torque). THERMAL DERATING Power Dissipation (Pdp) 6.0 mw 4.1W using H-type board 5.0 3.1W using I-type board 4.0 2.9W using J-type board 3.0 2.0 1.0 0 2 50 75 100 128 Ambient Temperature Ta( ) 150 This ICs package is POWER-SSOP, so improving the board on which the IC is mounted enables a large power dissipation without a heat sink. For example, using an 1 layer glass epoxy resin board, the ICs power dissipation is 2.9W at least. And it comes to 4.1W by using an improved 2 layer board. The information of the H, |, J type board is shown in the board information. MM 6249826 0027345 TTSMITSUBISHI <CONTROL / DRIVER IC> M56784FP SPINDLE MOTOR DRIVER HALL AMPLIFIER INPUT AND COMMUTATION The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 2. Hall elements U Hail inputs SOURSE Output current SINK FORWARD EC <ECR Figure 2. HALL AMPLIFIER INPUT SENSITIVITY SELECT MODE4 Figure 3 shows the hall amplifier input sensitivity select function. You are able to select a sensitivity of a hall amplifier out of two OPEN or HIGH GND levels which is suitable for the hall elements type. 120 degree 120 degree switching If the output minimum level of the hall elements is lower than gree ** lo current 50mVp-p, please connect the MODE4 pin to external GND. In this soft switching changes sharply. case, the output current changes shaply. if the output minimum Pe Laan level of the hall elements is higher than 50mVp-p, please make the The hall am The hall am minimum input mmininnurs int MODE4 pin open, then the output current is commutated softly. voltage is voltage is We recommend that the output level of the hall elements be set 50mVp-p. 35mVp-p. between 80mVp-p and 120mVp-p, and the MODE4 pin is an open. Figure 3. SLEEP MODE FUNCTION START / STOP (@ pin) LOW or OPEN HIGH Figure 4 shows the sleep mode function. If the @ pin [S/S] is set to be open or low, the motor drive outputs have high impedance and the motor stops. Then, the IC bias current will be a slight current Motor Stop Motor on (please refer to the electrical characteristics), and the hall bias , , output will be cut off. When the @ pin input is high, all the circuits Bi ff Bi las oO} las on will work. Hall-Bias off Hall-Bias on Figure 4, MM 6249626 0027344 434FORWARD AND REVERSE ROTATION DETECT FUNCTION Figure 5 shows the circuits and the functions of the forward and reverse rotation detect. The output of the RDS pin is determined by the signals of hall inputs (Hu+, Hu-, Hv+ and Hv-) which indicate the direction of rotation. MITSUBISHI <CONTROL / DRIVER IC> M56784FP SPINDLE MOTOR DRIVER When the motor is spinning forward, the RDS pin output will be low. When the motor rotates reversely in stop mode, it will be high. The RDS pin is pulled-up to Vcc1 by internal resistor (typ.10kohm). ROS MODE3 FG Vect Vec1 Hu+ Hu- Hv+t Hv Hw+ Hw- Fo-amp qe OOO T | | Qo 3 QT lo) z Hall sensor-amp Hight --F--f--F = mat Figure 5. @E 6245825 0027345 870 meAUTOMATICALY STOP AFTER REVERSE BRAK- ING FUNCTION Figure 5 also shows the automaticaly stop (after the reverse braking) circuit. Figure 6 is its function table which shows whether the automaticaly stop function is on or off, and its state is determined by MODES input. When the MODE3 is open or high, the motor will stop rotating automaticaly after the reverse braking. When the MODE3 is low or connected to GND, the motor will continue the reverse rotation. This function is useful for the case that the system doesnt require the automaticaly stop function, and in the system a motor receives a stop command from the outside of this IC. For example, a com can detect the reverse rotation MODE3 OPEN or HIGH GND AUTOMATIC UN-AUTOMATIC STOP (NON-STOP) Figure 6. REVERSE TORQUE MODE SELECT FUNCTION In the 4 times speed and the 6 times speed CDROM drive system, the reverse braking styie has been used for a deceleration of the rotation speed. However, in the CDROM drive system above an 8 times speed, the motor current above 0.5A is needed, because a high speed access time are required for motor driver !Cs. If the reverse braking is used at 0.5A, the IC junction temperature will be too much high, and the heat loss of the IC will be large. Therefore, this motor driver has the braking mode select function (REVERSE BRAKING MODE and SHORT BRAKING MODE). The breaking mode can be determined by the external logic signals synchronizing with servo timing, and it can make a heat loss of the IC smaller by adjusting the junction temperature. Figure 7 shows the reverse torque mode select function table. If you want the former braking style (the reverse braking), please select only the REVERSE BRAKING mode [MODE1 = LOW or OPEN and MODE2 = HIGH]. But the heat loss will be larger, and MITSUBISHI <CONTROL / DRIVER IC> M56784FP SPINDLE MOTOR DRIVER from the RDS pin output, and can control all the torque of a motor. So it can stop the motor outside this IC. FG FUNCTION Figure 5 also shows the circuits and the functions of the frequency generator. The FG pin outputs the square pulse signal synchronizing with the hail inputs [Hv+ and Hv-] timming. The FG pin is pulled-up to Vcc1 by an internal resistor [typ. 10Kohm]. sometimes external heat sink would be necessary. if it is possible to get ports more than two from pcom, you can flexibly control the four kinds of BRAKING MODE. So the heat loss can be half as usual. For example, the REVERSE BRAKING MODE is on under the CLV control, and the ALL SHORT BRAKING MODE is for seeking. When the motor should be stopped, the ALL SHORT BRAKING MODE or the REVERSE BRAKING MODE is available. If you can only get one port, you can control only the MODE2, At this time, you can control the two kinds of BRAKING MODE [commutated short or reverse] on condition that the MODE is set to be LOW or OPEN. BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE MODE1 LOW or OPEN HIGH sow COMMUTATED SHORT ALL SHORT Open | BRAKING BRAKING MODE2 OUTPUT OPEN HIGH | REVERSE BRAKING Tony inertia Figure 7. WE b24982b O0e734b 707MITSUBISHI <CONTROL / DRIVER IC> M56784FP SPINDLE MOTOR DRIVER REVERSE TORQUE MODE SELECT FUNCTION Figure 8 shows an example for the reverse torque mode select. The CASE1 is an example for controlled REVERSE and COMMUTATED SHORT BRAKING. The CASE2 is an example for controlled REVERSE and ALL SHORT BRAKING. CASE 1 CASE 2 REVERSE AND COMMUTATED REVERSE AND ALL SHORT BRAKING SELECT SHORT BRAKING SELECT EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V} sav EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V} Bente nde dee eee MODE1 HIGH * 6 8 fo at 7 ' 6 6 8 boa ' | ' MODE2 , ' , ' oe i lo ! T T T ' ' BRAKING FORWARD EW vemt-vd-Vasat/ Ra Vd; diode voltage Vat ; npn transistor saturation voltage: Ra ; motor Inner resistance Figure 8. ME 6249826 0027347 243 myM56784FP saturation voltage 2 2 a a oO - 5V) SPINDLE MOTOR DRIVER Vm = 12V, Voc MITSUBISHI <CONTROL / DRIVER ICc> ee eee ry Bottom side saturation voltage Top side saturation voltage 0.83 1200 1000 wr a tew eens! Load current (mA) 5V) or ea ee eee n nn nme p ewes w nw cece egw nee wen eenen g i 8 | a Leo on : 28 i 68st 1 89 seeeee i 85 +t i #3 ; U4 vases i. vesedeceeee This device can use this voltage value due to motor drive. 400 5V, Vec 6V, Vm wee cc eee dann Gee... 0.07 By taking advantage of bootstrap function, the output saturation voltage can be lower. Output saturation voltage and Load current Characteristics. (At bootstrap) (Condition Vec2 A 1 1 ' ' ' ' ' 1 4 . . ' 1 1 ' ' ' . 1 1 ' ' ' 1 ' ' L e . ' . 1 pom anne t Output saturation voitage and Load current Characteristics. (Condition Vec2 11.5 BASICALLY CHARACTERISTICS This data is an example for typical sample. 10.5 18 (a) e6eyo, nding ee 1.0 45 4.0 6 = 3.5 1.0 (A) e6e yo, jndyng Bottom side saturation voltage 1200 1000 800 Load current (mA) 0.32 .. 400 MB 624982b 0027348 S&T 0.07 pe ee a ee eee 0.5MITSUBISHI <CONTROL / DRIVER IC> MS6784FP SPINDLE MOTOR DRIVER HB terminal voltage and Hall current characteristics. (Condition : Vcc = 4.4V - 7V) Same m wane we ene tenn ne le new qe------ we eee nen enn nn een nnn ge eee nn de ee ewe web awww wba wwe ww dew enna da nnnne 1.6 1.4 1.2 1.0 0.8 0.6 (A) aBey0n joule) gH 04 0.2 Hall current (mA) M@@ 6249826 0027349 41ib aMITSUBISHI <CONTROL / DRIVER IC> M56784FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT 44com control BRAKING Forward reverse MODE rotation signal FG signal SELECT 12V Motor power supply a (> 5 (3 j~t Start / Stop 104 Oo | -K{8 g_ ar iT a g= & Motor current sense resistor Control PWM1 JEPAAUCD [/A Reference Pwe2 1 8 to 14 and 29 to 35 5V Power Supply 10uF MM 6249826 027350 138 \\