MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M56787FP is a semiconductor integrated circuit in order to drive the spindle motor. FEATURES Low motor echo noise. 3.3V DSP available. Large power dissipation package(Power Package). High motor drive current . Wide dynamic range. Motor current control for both motor torque directions. Reverse torque mode select [SHORT BRAKING,etc]. Sleep mode. FG signal output terminal. FG pulse select. Automatic stop. N.C 1 42 N.C N.C 2 41 N.C S/S 3 40 W FGS 4 39 V FG 5 38 U CI 6 37 MGND BRS 7 36 TP 8 35 9 34 APPLICATION CD-ROM, DVD, DVD-ROM, DVD-RAM etc. GND 11 12 M56787FP 10 33 GND 32 31 13 30 14 29 RS 15 28 Hw- VCC2 16 27 Hw+ EC 17 26 Hv- ECR 18 25 Hv+ VCC1 19 24 Hu- HB 20 23 Hu+ N.C 21 22 N.C Outline 42P9R-A BLOCK DIAGRAM RS 15 VCC2 16 BRS 7 V W MGND S/S VCC1 38 39 40 37 3 19 CURRENT SENSE & LIMIT BRAKING MODE CHANGE 120 MATRIX REVERSE DETECT GND 29 to 35 6 U 8 to 14 CI N.C: no connection GND 1 N.C 2 N.C 21 N.C 22 N.C 41 N.C 42 N.C TSD FG 5 + - + - + - FG & SELECT FGS CONTROL HALL BIAS 4 23 24 25 26 27 28 20 36 17 18 Hu+ Hu- Hv+ Hv- Hw+ Hw- HB TP EC ECR MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER PIN DESCRIPTIONS Pin No. 1 2 3 4 5 6 7 8 - 14 15 16 17 18 19 20 21 Symbol N.C N.C S/S FGS FG CI BRS GND RS VCC2 EC ECR VCC1 HB N.C Function Pin No. 42 41 Start / Stop FG pulse select Frequency generator output Phase Compensation Reverse torque mode select GND Motor current sense 12V supply voltage Motor speed control The reference voltage for EC 5V supply voltage Bias for Hall Sensor 40 39 38 37 36 29 - 35 28 27 26 25 24 23 22 Symbol N.C N.C W V U MGND TP GND HwHw+ HvHv+ HuHu+ N.C Function Motor drive output W Motor drive output V Motor drive output U Motor GND Test Note1 GND Hw- Sensor amp. input Hw+ Sensor amp. input Hv- Sensor amp. input Hv+ Sensor amp. input Hu- Sensor amp. input Hu+ Sensor amp. input * Pull-up resistors (10kohm) are included in the circuits connected to [FG] pin. * Note1. The 24 pin (TP) is test terminal. Please make an open the 24 pin (TP). ABSOLUTE MAXIMUM RATING (Ta=25C) Symbol RS VCC2 VCC1 Io Parameter Motor supply voltage 12V supply voltage 5V supply voltage Output current VH(c) Sensor amp. Differential input range Pt K Tj Topr Tstg Power dissipation Thermal derating Junction temperature Operating temperature Storage temperature Conditions pin 16 pin 19 pin Note 2 15 23 - 28 pins Free Air Free Air Rating 16 16 7.0 1.5 Unit V V V A 4.5 V 1.2 9.6 150 -20 - +75 -40 - +125 W mW/C C C C *Note2 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation RECOMMENDED OPERATING CONDITIONS Symbol VCC1 VCC2 Io Parameter 5V Power supply 12V Power supply Output drive current Min. 4.5 4.5 Limits Typ. 5.0 12.0 Max. 5.5 13.2 1000 Unit V V mA MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V , Ta=25C unless otherwise noted.) Symbol Parameter Conditions Min. Limits Typ. Unit Max. Isleep Sleep Mode Supply current VCC1 & VCC2 pin total Current (at S/S pin low or open) 10 A Icc Supply current VCC1 & VCC2 pin total Current (EC=ECR=1.5V) [S/S pin High] 10 mA Vsat Saturation voltage Top and Bottom saturation voltage. (Load current :500mA) 1.2 1.9 V -30 +30 1.65 1.65 0.4 0.3 0 +60 3.3 3.3 0.46 0.33 V V V/V V 4.4 V 1.2 30 mVp-p V mA ECdeadECdead+ ECR EC Gio Vlim VH com Control voltage dead zone Reference voltage Input range Control voltage Input range Control gain Control limit Hall sensor amp common mode input range EC < ECR EC > ECR 18 pin [3.3V DSP available] 17 pin..[3.3V DSP available] Io = Gio / Rsense [A/V] Ilim = Vlim / Rsense [A] 23 - 28 -60 0 0 0 0.34 0.27 1.3 pins mV 23 - 28 pins Load current (IHb) =10 mA. 60 0.6 Motor start voltage [S/S]pin input voltage when it starts up the motor. *The IC is in the active condition. *The hall bias are available. 2.0 Voff Motor stop voltage [S/S]pin input voltage when it stops the motor. *The IC is in the sleep condition. *The hall bias are off. ViH1 BRS input high voltage BRS input voltage that the short braking is selected when the reverse torque. 3.6 ViM BRS input middle voltage BRS input voltage that the free run is selected when the reverse torque. Note3. 1.6 ViL1 BRS input low voltage BRS input voltage that the reverse braking is selected when the reverse torque. ViH2 Logic input high voltage [FGS] input voltage when it is HIGH. ViL2 Logic input Low voltage [FGS] input voltage when it is LOW. 0.8 V VOL [FG] pin output low voltage Io current = 1mA 0.5 V VHmin VHb IHb Hall sensor amp. input signal level Hall bias terminal output voltage Hall bias terminal sink current Von 0.85 V 0.8 V V 2.2 V 0.8 V 2.0 V *Note3. The ViM is the limit in case of external voltage input control. The free run mode is selected when the BRS pin is open, too. THERMAL CHARACTERISTICS Symbol Parameter Function start temperature of IC Min. TSD Thermal Shut Down Typ. 165 Max. Function stop temperature of IC Min. Typ. 125 Unit Max. C MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER The relationship with I/O control and the braking mode BRS=LOW REVERSE BRAKING Reverse Torque Current limit 0 - +60mV 0.8A/V EC - ECR 0 0 - -60mV 0.8A/V The braking mode is selected flexibly by using the BRS terminal. The relationship between the EC-ECR (the difference between (EC<control voltage> and ECR <reference voltage> ) and the torque is shown in Figure 1,2 and 3. The current gain is 0.8A/V (at sensing resistor :0.5ohm) in forward torque directions, and the dead zone is from 0mV to 60mV. When the reverse brake mode(BRS=Lo) is selected, the coil current gain under the reverse torque control is the same with in forward torque directions. Current limit Forward Torque Figure 1. BRS=Hi SHORT BRAKING Reverse Torque 0 EC - ECR When the short brake mode(BRS=Hi) is selected, the coil current under the reverse torque control depends on the back emf. and the coil resistance. 0 - -60mV 0.8A/V Current limit Forward Torque Figure 2. BRS=Open FREE RUN 0 0.8A/V EC - ECR 0 - -60mV Current limit Forward Torque Figure 3. When the free run mode(BRS=open) is selected, the coil current under the reverse torque control (EC-ECR>0) becomes zero and in free run situation. MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER THERMAL DERATING 6.0 (W) 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. 4.0W using H-type board Power Dissipation (Pdp) 5.0 3.0W using I-type board 4.0 2.7W using J-type board 3.0 2.0 1.0 0 25 50 75 100 Ambient Temperature 125 150 Ta (C) HALL AMPLIFIER INPUT AND COMMUTATION The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 4. Hw+ Hu+ Hv+ Hall elements U Outer loator V Hall inputs V U U V W SOURSE W W V V U W U Output current V W SINK U Figure 4. W V U W FORWARD EC<ECR REVERSE EC>ECR MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER SLEEP MODE FUNCTION START / STOP (S/S pin) LOW or OPEN HIGH Motor Stop Bias off Hall-Bias off Motor on Bias on Hall-Bias on Figure 5 shows the sleep mode function. If the [S/S] pin 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 [S/S] pin input is high, all the circuits will work. Figure 5. FG FUNCTION FG pulse select (FGS pin) LOW or OPEN HIGH NX1 pulse NX3 pulse It is possible for user to switch the output pulse numeric by external logic control using FG pulse select terminal [FGS]. Figure 6 shows the FG pulse select function. The FG pin outputs the square pulse signal synchronizing with the hall inputs [Hv+ and Hv-] timming when FGS=LOW or OPEN. When FGS=HIGH, it outputs the square pulse signal of 3 times. The FG pin is pulled-up to VCC1 by an internal resistor [typ. 10Kohm]. Figure 6. BRAKING MODE SELECT FUNCTION Braking mode select [BRS] pin HIGH SHORT BRAKE OPEN FREE RUN LOW REVERSE BRAKE Figure 7. It is possible to select three kinds of mode [the reverse braking,the short braking and the free run] in reverse torque by logic control using the BRS terminal. Figure 7 shows the function table of the braking mode select. It is the reverse braking when BRS is LOW,the short braking when BRS is HIGH and the free run when BRS is OPEN. MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT 1 N.C N.C 42 2 N.C N.C 41 3 5 S/S W 120 MATRIX 4 FGS FG 40 V 39 38 MGND 104 BRAKING MODE CHANGE BRS 7 104 U V CI 6 104 W 37 TP 104 36 U 35 9 34 10 33 11 32 12 31 CURRENT SENSE LIMIT 8 13 14 Please make an open 36 pin(TP) terminal. 30 29 0.5 15 12V 10F RS Control PWM1 - 17 27 CTL 18 26 BIAS..TSD VCC1 + 19 20 25 24 21 N.C 5V 10F FG REVERSE DETECT Hv- Hv+ HuHu + HB HALL BIAS Hw+ Hv - Reference PWM2 HwHw - ECR 28 + VCC2 EC 16 23 22 N.C Hu+ Hall bias resistor MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER AREA OF SAFTY OPERATION Tpw=500msec [Actual Data] Tpw=4msec 2.0 1.5 Corrector current IC [A] 1.0 0.5 0.3 0.1 1 2 3 4 5 6 7 10 12 16 20 30 50 Voltage during corrector and emitter VCE [ volt ] Measurement circuits IC Power supply IC 1 pulse + - Emitter current control VCE VCE Tpw measured characteristics