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| MITSUBISHI M56787FP SPINDLE MOTOR DRIVER DESCRIPTION The M56787FP is a semiconductor integrated circuit in order to drive the spindle motor. PIN CONFIGURATION (TOP VIEW) N.C 1 2 3 4 5 6 7 8 9 42 41 40 39 38 37 36 35 34 N.C N.C W V U MGND TP FEATURES q Low motor echo noise. q 3.3V DSP available. q Large power dissipation package(Power Package). q High motor drive current . q Wide dynamic range. q Motor current control for both motor torque directions. q Reverse torque mode select [SHORT BRAKING,etc]. q Sleep mode. q FG signal output terminal. q FG pulse select. q Automatic stop. N.C S/S FGS FG CI BRS M56787FP M56787FP APPLICATION CD-ROM, DVD, DVD-ROM, DVD-RAM etc. GND 10 11 12 13 14 RS 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 N.C: no connection GND Outline 42P9R-A BLOCK DIAGRAM U 38 CI 6 CURRENT SENSE & LIMIT V 39 W 40 MGND 37 S/S 3 VCC1 19 8 to 14 RS VCC2 15 16 GND BRS 7 29 to 35 BRAKING MODE CHANGE 120 MATRIX REVERSE DETECT TSD GND 1 2 21 FG 5 FG & SELECT FGS 4 23 Hu+ 24 Hu25 Hv+ 26 Hv27 Hw+ 28 Hw20 HB 36 TP 17 EC 18 ECR + + + HALL BIAS CONTROL 22 41 42 N.C N.C N.C N.C N.C N.C MITSUBISHI 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 Symbol N.C N.C W V U MGND TP GND HwHw+ HvHv+ HuHu+ N.C Function - 35 28 27 26 25 24 23 22 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 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 16 pin 19 pin Note 2 15 23 - 28 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 pins Free Air Free Air *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 M56787FP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V , Ta=25C unless otherwise noted.) Symbol Isleep Icc Vsat ECdeadECdead+ ECR EC Gio Vlim VH com VHmin VHb IHb Von Parameter Sleep Mode Supply current Supply current Saturation voltage 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 level Hall bias terminal output voltage Hall bias terminal sink current Motor start voltage Conditions VCC1 & VCC2 pin total Current (at S/S pin low or open) VCC1 & VCC2 pin total Current (EC=ECR=1.5V) [S/S pin High] Top and Bottom saturation voltage. (Load current :500mA) 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 Min. Limits Typ. Max. 10 10 Unit A mA V mV V V V/V V V mVp-p V mA V 1.2 -60 0 0 0 0.34 0.27 1.3 60 0.6 -30 +30 1.65 1.65 0.4 0.3 1.9 0 +60 3.3 3.3 0.46 0.33 4.4 - 28 pins 23 - 28 pins Load current (IHb) =10 mA. 0.85 1.2 30 [S/S]pin input voltage when it starts up the motor. *The IC is in the active condition. *The hall bias are available. [S/S]pin input voltage when it stops the motor. *The IC is in the sleep condition. *The hall bias are off. BRS input voltage that the short braking is selected when the reverse torque. BRS input voltage that the free run is selected when the reverse torque. Note3. BRS input voltage that the reverse braking is selected when the reverse torque. [FGS] input voltage when it is HIGH. [FGS] input voltage when it is LOW. Io current = 1mA 2.0 Voff Motor stop voltage 0.8 V ViH1 ViM ViL1 ViH2 ViL2 VOL BRS input high voltage BRS input middle voltage BRS input low voltage Logic input high voltage Logic input Low voltage [FG] pin output low voltage 3.6 1.6 2.2 0.8 2.0 0.8 0.5 V V V V V 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 TSD Parameter Thermal Shut Down Function start temperature of IC Min. Typ. 165 Max. Function stop temperature of IC Min. Typ. 125 Max. C Unit MITSUBISHI 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 0 EC - ECR 0.8A/V 0 - -60mV The braking mode is selected flexibly by using the BRS terminal. The relationship between the EC-ECR (the difference between (EC 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. 0.8A/V 0 - -60mV Current limit Forward Torque Figure 2. BRS=Open FREE RUN 0 EC - ECR 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. 0.8A/V 0 - -60mV Current limit Forward Torque Figure 3. MITSUBISHI M56787FP SPINDLE MOTOR DRIVER THERMAL DERATING 6.0 (W) 4.0W using H-type board 5.0 3.0W using I-type board 4.0 2.7W using J-type board 3.0 Power Dissipation (Pdp) 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 (C) 125 150 Ambient Temperature HALL AMPLIFIER INPUT AND COMMUTATION The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 4. Hw+ Hv+ Hu+ Hall elements U Outer loator U SOURSE W V W U W V U V W REVERSE EC>ECR Hall inputs V U W V V Output current SINK U W V U W FORWARD EC MITSUBISHI M56787FP SPINDLE MOTOR DRIVER SLEEP MODE FUNCTION START / STOP (S/S pin) LOW or OPEN HIGH Motor Stop Bias off Hall-Bias off Figure 5. 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. 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 M56787FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT 1 2 N.C N.C S/S 120 MATRIX FGS W N.C N.C W 42 41 104 40 3 4 V 39 U V MGND 37 TP U 36 35 34 33 32 31 30 29 Please make an open 36 pin(TP) terminal. 104 38 104 5 FG CI 6 BRS 7 8 9 104 10 11 12 13 14 0.5 12V 10F VCC2 EC Control PWM1 Reference PWM2 ECR 15 RS 16 17 CTL 18 BIAS..TSD 19 20 HB HALL BIAS + CURRENT SENSE LIMIT + BRAKING MODE CHANGE 28 27 26 25 24 23 22 N.C HwHw Hw+ HvHv Hv+ HuHu VCC1 + - 21 N.C 5V 10F FG REVERSE DETECT Hu+ Hall bias resistor MITSUBISHI M56787FP SPINDLE MOTOR DRIVER AREA OF SAFTY OPERATION Tpw=500msec [Actual Data] Tpw=4msec 2.0 1.5 1.0 IC [A] Corrector current 0.5 0.3 0.1 1 2 3 4 5 67 10 12 16 20 30 50 Voltage during corrector and emitter VCE [ volt ] Measurement circuits IC Power supply IC 1 pulse + VCE VCE Emitter current control Tpw measured characteristics |
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