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| MITSUBISHI M56785FP SPINDLE MOTOR DRIVER DESCRIPTION The M56785FP is a semiconductor integrated circuit in order to drive the spindle motor. PIN CONFIGURATION (TOP VIEW) N.C S/S RDS FG CI MODE2 MODE1 1 2 3 4 5 6 7 8 9 42 41 40 39 38 37 36 35 34 N.C W V U RS MODE3 MODE4 FEATURES q Large power dissipation (Power Package). q 3.3V DSP available. q The supply voltage with wide range. q High motor drive current . q Low saturation voltage. (typical 1.2V at load current 500mA) q Motor current control for both motor torque directions. q Reverse torque mode select [SHORT BRAKING,etc]. q Sleep mode. (Zero total current ) q Hall amplifier sensitivity select. (Minimum voltage : 35mVp-p or 50mVp-p) q FG signal output terminal. q Automatic stop select. (Removable function) q Reverse detected signal pin. M56785FP 10 GND 11 12 13 14 VM VCC2 EC ECR VCC1 HB N.C 15 16 17 18 19 20 21 33 32 31 30 29 28 27 26 25 24 23 22 HwHw+ HvHv+ HuHu+ N.C GND APPLICATION CD-ROM,DVD,DVD-ROM,DVD-RAM etc. Outline 42P9R-A N.C: no connection BLOCK DIAGRAM U 39 V 40 W 41 S/S 2 RS 38 VCC1 19 VM VCC2 15 16 ++ - Vref 8 to 14 GND MODE1 7 BRAKING MODE CHANGE I/I Converter 120 MODE2 6 29 to 35 MATRIX SENSE TSD MODE3 FG RDS 37 4 3 23 Hu+ 24 Hu25 Hv+ 26 Hv27 Hw+ 28 Hw20 HB 5 CI 17 EC 18 ECR FG RDS + + + Hall Bias V/I Converter GND MODE4 36 MITSUBISHI M56785FP SPINDLE MOTOR DRIVER PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 Symbol N.C S/S RDS FG CI MODE2 MODE1 GND VM VCC2 EC ECR VCC1 HB N.C Function Pin No. 22 Symbol N.C Hu+ HuHv+ HvHw+ HwGND MODE4 MODE3 RS U V W N.C 4 Function - 14 15 16 17 18 19 20 21 Start / Stop Reverse detected signal Frequency generator output Phase Compensation Reverse torque mode select 2 Reverse torque mode select 1 GND Motor supply voltage 12V supply voltage Motor speed control The reference voltage for EC 5V supply voltage Bias for Hall Sensor 23 24 25 26 27 28 29 - 35 36 37 38 39 40 41 42 Hu+ Sensor amp. input Hu- Sensor amp. input Hv+ Sensor amp. input Hv- Sensor amp. input Hw+ Sensor amp. input Hw- Sensor amp. input GND Hall amplifier sensitivity select Automatic stop select Motor current sense Motor drive output U Motor drive output V Motor drive output W * Pull-up resistors (10kohm) are included in the circuits connected to 3 pin [RDS] and pin[FG]. ABSOLUTE MAXIMUM RATING (Ta=25 Symbol VM VCC2 VCC1 Io VH(c) Pt K Tj Topr Tstg Parameter Motor supply voltage 12V supply voltage 5V supply voltage Output current Sensor amp. Differential input range Power dissipation Thermal derating Junction temperature Operating temperature Storage temperature ) Conditions pin pin 19 pin Note 1 15 16 23 Rating 16 16 7.0 1.5 4.5 1.2 9.6 150 -20 - +75 -40 - +125 Unit V V V A V W mW/C C C C - 28 pins Free Air Free Air *Note1 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation MITSUBISHI M56785FP SPINDLE MOTOR DRIVER RECOMMENDED OPERATING CONDITIONS Symbol VCC1 VCC2 VM Io Parameter 5V Power supply 12V Power supply Motor Power supply Output drive current Min. 4.5 4.5 4.5 Limits Typ. 5.0 12.0 12.0 Max. 5.5 13.2 13.2 700 Unit V V V mA ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V, VM=12V, Ta=25C unless otherwise noted.) Symbol Icc1 Icc2 Icc3 Vsat ECdeadECdead+ ECR EC Gio Vlim VH com VHmin1 VHmin2 VHb IHb Parameter Sleep Mode Supply current- 1 Sleep Mode Supply current- 2 Supply current- 3 Saturation voltage Dead Zone Control voltage dead zone Reference voltage Input range Control voltage Input range Control gain Control limit Hall sensor amp common mode input range Hall sensor amp. input signal revel Hall bias terminal output voltage Hall bias terminal sink current Motor start voltage 2 pin input voltage when it starts up the motor. *The IC is in the active condition. *The hall bias is available. 2 pin input voltage when it stops the motor. *The IC is in the sleep condition. *The hall bias is off. 7 pin[MODE1], 6 pin[MODE2], 37 pin[MODE3] and 36 pin[MODE4] input voltage when they are HIGH. 7 pin[MODE1], 6 pin[MODE2], 37 pin[MODE3] and 36 pin[MODE4] input voltage when they are LOW. 15 Conditions and 16 pin total Input Current ( 2 pin low or open) pin Input Current ( 2 pin low or open) pin Input Current (EC=ECR=2.5V) [ 2 Min. Limits Typ. 0 Max. 100 500 Unit A A mA V mV V V V/V V V mV p-p 19 19 pin High] 1.2 -40 0 0.5 0.5 0.25 0.27 1.2 -21 +21 1.65 1.65 0.3 0.3 6.0 1.9 0 +40 4.0 4.0 0.35 0.33 4.5 Top and Bottom saturation voltage. (Load current :500mA) EC < ECR EC > ECR 18 pin pin [3.3v DSP available] [3.3v DSP available] 17 Io = Gio / Rsense [A/V] Ilim = Vlim / Rsense [A] 23 - 28 pins MODE4=OPEN or HIGH MODE4=GND 23 - 28 pins 50 35 0.6 0.85 1.2 30 Load current (IHb) =10 mA. V mA Von 2.0 V Voff Motor stop voltage 0.8 V ViH mode pin input high voltage mode pin input low voltage 3pin[RDS],4pin[FG] output low voltage 2.0 V ViL 0.8 V VOL Io current = 1mA 0.5 V MITSUBISHI M56785FP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V, VM=12V, Ta=25C Unless otherwise noted. ) Reverse Torque Current limit 0 - +40mV 0.6A/V The relationship between the EC-ECR (the difference between EC<(control voltage> and ECR 0 EC - ECR 0.6A/V 0 - -40mV Current limit Forward Torque Figure 1. The characteristics of the control voltage and motor current ( Torque ). THERMAL DERATING 6.0 (W) 5.0 Power Dissipation (Pdp) 3.0W using B-type board 4.0 2.7W using C-type board 3.0 4.0W using A-type board This IC's 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 IC's power dissipation is 2.7W at least. And it comes to 4.0W by using an improved 2 layer board. The information of the H, I, J type board is shown in the board information. 2.0 1.0 0 25 50 75 100 Ta ( ) 125 150 Ambient Temperature MITSUBISHI M56785FP 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. Hw+ Hv+ Hu+ Hall elements V U Outer loator U W V U U W V REVERSE EC>ECR Hall inputs V U W V SOURSE W V W Output current SINK U W V U W FORWARD EC HALL AMPLIFIER INPUT SENSITIVITY SELECT MODE4 OPEN or HIGH GND 120 degree switching 120 degree soft switching ** Io current changes sharply. Figure 3 shows the hall amplifier input sensitivity select function. You are able to select a sensitivity of a hall amplifier out of two levels which is suitable for the hall elements type. If the output minimum level of the hall elements is lower than 50mVp-p, please connect the MODE4 pin to external GND. In this case, the output current changes shaply. If the output minimum level of the hall elements is higher than 50mVp-p, please make the MODE4 pin open, then the output current is commutated softly. We recommend that the output level of the hall elements be set between 80mVp-p and 120mVp-p, and the MODE4 pin is an open. The hallamp minimum input voltage is 50 mVp-p. The hallamp minimum input voltage is 35 mVp-p. Figure 3. SLEEP MODE FUNCTION START / STOP ( LOW or OPEN 2 pin) HIGH Figure 4 shows the sleep mode function. If the 2 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 wil be a slight current (please refer to the electrical characteristics), and the hall bias output will be cut off. When the 2 pin input is high, all the circuits will work. Motor Stop Bias off Hall-Bias of Motor on Bias on Hall-Bias on Figure 4. MITSUBISHI M56785FP SPINDLE MOTOR DRIVER FORWARD 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. 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). RDS MODE3 FG VCC1 VCC1 FG-amp CI + Hu+ Hu- Hv+ Hv- Hw+ Hw- - Q Q R D T + Hall sensor-amp - EC-ECR FORWARD Hw+ Hv+ Hu+ REVERSE Comparator Hysteresis D T Q High RDS FG Low High Low RDS FG D T Q High Low High Low Hw+ Hu+ Hv+ Figure 5. MITSUBISHI M56785FP SPINDLE MOTOR DRIVER AUTOMATICALY STOP AFTER REVERSE BRAKING 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 MODE3 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 doesn't 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 from the RDS pin output, and can control all the torque of a motor. So it can stop the motor outside this IC. REVERSE TORQUE MODE SELECT FUNCTION In the 4 times speed and the 6 times speed CDROM drive system, the reverse braking style 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 ICs. 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 sometimes external heat sink would be necessary. If it is possible to get ports more than two from com, 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 MODE1 is set to be LOW or OPEN. BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE MODE1 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 hall inputs [Hv+ and Hv-] timming . The FG pin is pulled-up to VCC1 by an internal resistor [typ. 10Kohm]. MODE3 OPEN or HIGH GND AUTOMATIC STOP UN-AUTOMATIC (NON-STOP) LOW or OPEN MODE2 HIGH LOW or OPEN COMMUTATED SHORT BRAKING HIGH ALL SHORT BRAKING Figure 6. REVERSE BRAKING OUTPUT OPEN [only inertia] Figure 7. MITSUBISHI M56785FP 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 REVERSE AND COMMUTATED SHORT BRAKING SELECT EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V] 5.0V CASE 2 REVERSE AND ALL SHORT BRAKING SELECT EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V] 5.0V 3.0V ECR 2.5V 2.0V 3.0V ECR 2.5V 2.0V 0V HIGH MODE2 LOW MODE1 LOW BRAKING MODE +1A FORWARD CURRENT REVERSE TORQUE CURRENT -1A Commutated short BRAKING REVERSE BRAKING 0V HIGH MODE2 LOW MODE1 LOW BRAKING MODE +1A MOTOR CURRENT FORWARD CURRENT REVERSE TORQUE CURRENT -1A +60 0mA ALL SHORT BRAKING REVERSE BRAKING MOTOR CURRENT [ Rsense = 0.5 ohm ] +60 0mA -60 0mA MOTOR STOP -60 0mA MOTOR STOP ( Vbemf-Vd-Vsat ) / Ra Vd ; diode voltage Vsat ; npn transistor saturation voltage Ra ; motor inner resistance Figure 8. MITSUBISHI M56785FP SPINDLE MOTOR DRIVER BASICALLY CHARACTERISTICS This data is an example for typical sample. Output saturation voltage and Load current Characteristics. (Condition Vcc2=Vm=12V, Vcc=5V) 12.0 Top side saturation voltage 0.91 0.98 1.05 1.18 Output Voltage (V) 10.5 This device can use this voltage value due to motor drive. 11.5 0.76 11.0 0.79 0.86 0.89 1.5 1.0 0.62 0.49 0.5 0.07 0 0 200 400 600 Load current (mA) 800 1000 1200 0.13 0.25 0.32 0.38 Bottom side saturation voltage 0.76 Output saturation voltage and Load current Characteristics. (At bootstrap) By taking advantage of bootstrap function, the output saturation voltage can be lower. (Condition Vcc2=6V,Vm=5V,Vcc=5V) 5.0 0.06 4.5 0.29 0.12 0.23 0.35 0.47 0.62 Top side saturation voltage 0.83 4.0 Output Voltage (V) 3.5 This device can use this voltage value due to motor drive. 1.5 1.0 0.49 0.62 0.76 0.5 0.07 0 0 200 400 0.13 0.25 0.32 0.38 Bottom side saturation voltage 600 800 1000 1200 Load current (mA) MITSUBISHI M56785FP SPINDLE MOTOR DRIVER HB terminal voltage and Hall current characteristics. (Condition :Vcc=4.4V - 7V) 1.6 1.4 1.2 HB terminal voltage (V) 1.0 0.85 0.8 0.6 0.4 0.2 0 0 10 20 30 40 50 Hall current (mA) MITSUBISHI M56785FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT com control BRAKING MODE SELECT 0 to 1.5 10F 15 16 37 36 3 4 7 6 12V Motor power supply Forward reverse rotation signal FG signal 5V SENSE FG RDS BRAKING MODE CHANGE Hall bias resistor 23 + 39 HU 24 25 - 104 120 MATRIX + 104 40 HV 26 27 + 104 41 HW 28 Bias 20 Hall TSD Start / Stop 2 104 5 17 V/I Converter I/I Converter ++ Motor current sense resistor 38 Vlim 0.5 Control PWM1 18 19 Reference PWM2 8 to 14 and 29 to 35 5V Power Supply 10F |
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