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| MITSUBISHI M56784FP SPINDLE MOTOR DRIVER DESCRIPTION The M56784FP is a semiconductor integrated circuit in order to drive the spindle motor. PIN CONFIGURATION (TOP VIEW) N.C W V U RS MODE3 MODE4 1 2 3 4 5 6 7 8 9 42 41 40 39 38 37 36 35 34 N.C S/S RDS FG CI MODE2 MODE1 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. M56784FP 10 GND 33 32 31 30 29 28 27 26 25 24 23 22 VM VCC2 EC ECR VCC1 HB N.C GND 11 12 13 14 APPLICATION CD-ROM, DVD, DVD-ROM, DVD-RAM etc. HwHw+ HvHv+ HuHu+ N.C 15 16 17 18 19 20 21 Outline 42P9R-D N.C: no connection BLOCK DIAGRAM U 4 V 3 W 2 S/S 41 RS 5 VCC1 24 VM VCC2 28 27 ++ Vref 8 to 14 MODE1 36 MODE2 37 BRAKING MODE CHANGE 120 MATRIX SENSE TSD I/I Converter GND 29 to 35 GND MODE4 7 MODE3 FG RDS 6 39 40 20 Hu+ 19 Hu18 Hv+ 17 Hv16 Hw+ 15 Hw23 HB CI 38 FG RDS + + + Hall Bias V/I Converter 26 EC 25 ECR MITSUBISHI M56784FP SPINDLE MOTOR DRIVER PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 Symbol N.C W V U RS MODE3 MODE4 GND HwHw+ HvHv+ HuHu+ N.C Function -- Motor drive output W Motor drive output V Motor drive output U Motor current sense Automatic stop select Hall amplifier sensitivity select 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 -- 24 Pin No. 22 23 24 25 26 27 28 29 Symbol N.C HB VCC1 ECR EC VCC2 VM GND MODE1 MODE2 CI FG RDS S/S N.C Function -- Bias for Hall Sensor 5V supply voltage The reference voltage for EC Motor speed control 12V supply voltage Motor supply voltage GND Reverse torque mode select 1 Reverse torque mode select 2 Phase Compensation Frequency generator output Reverse detected signal Start / Stop -- - 14 15 16 17 18 19 20 21 - 36 37 38 39 40 41 42 35 *Pull-up resistors (10kohm) are included in the circuits connected to pin[RDS] and 25 pin[FG]. ABSOLUTE MAXIMUM RATING (Ta = 25C) 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 pin pin 24 pin *note 1 28 27 15 Conditions Rating 16 16 7.0 1.5 Units V V V A V W mW/C C C C - 20 pins 4.5 1.2 9.6 150 -20 - +75 -40 - +125 Free Air Free Air *Note1. The ICs must be operated within the Pt (power dissipation) or the area of safety operation. MITSUBISHI M56784FP 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 Units V V V mA ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V ,VM=12V, Ta=25C unless otherwise noted.) Symbol ICC1 ICC2 ICC3 Parameter Sleep Mode Supply current - 1 Sleep Mode Supply current - 2 Supply current - 3 Conditions 28 and 27 pin total Input Current ( 41 pin low or open) Min. -- -- -- -- -40 0 0.5 0.5 0.25 0.27 1.2 Limits Typ. 0 -- -- 1.2 -21 +21 1.65 1.65 0.3 0.3 -- -- -- 0.85 -- Max. 100 500 6.0 1.9 0 +40 4.0 4.0 0.35 0.33 4.5 -- -- 1.2 30 Units A A mA V mV V V V/V V V mVp-p V mA pin Input Current ( 41 pin low or open) pin Input Current (EC = ECR = 2.5V) [ 41 pin High] 24 24 Vsat ECdeadECdead+ ECR EC Gio Vlim VH com VHmin1 VHmin2 VHb IHb Saturation voltage Control voltage dead zone Reference voltage Input range Control voltage Input range Control gain Control limit Hall senser amp. common mode input range Hall sensor amp. input signal revel Hall bias terminal output voltage Hall bias terminal sink current Top and Bottom saturation voltage (Load current: 500mA) EC < ECR EC > ECR 25 pin [3.3V DSP available] 26 pin [3.3V DSP available] Io = Gio / Rsense [A/V] Ilim = Vlim / Rsense [A] 15 - - 20 pins pins MODE4 = OPEN or HIGH 15 20 MODE4 = GND 50 35 0.6 -- Load current (IHb) 10mA. 41 Von Motor start voltage 41 pin input voltage when it starts up the motor. *The IC is in the active condition. *The hall bias is available. pin input voltage when it stops the motor. *The IC is in the sleep condition. *The hall bias is off. 2.0 -- -- V Voff Motor stop voltage -- -- 0.8 V ViH Mode pin input high voltage 36 pin [MODE1], 37 pin [MODE2], 6 pin [MODE3] and 7 pin [MODE4] input voltage when they are HIGH. 36 pin [MODE1], 37 pin [MODE2], 6 pin [MODE3] and 7 pin [MODE4] input voltage when they are LOW. 2.0 -- -- V ViL Mode pin input low voltage 40 pin[RDS], 39 pin[FG] output low voltage -- -- 0.8 V VOL Io current = 1mA -- -- 0.5 V MITSUBISHI M56784FP 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 0 EC - ECR 0.6A/V 0 - -40mV The relationship between the EC-ECR (the difference between EC ( Current limit Forward Torque Figure 1. The characteristics of the control voltage and motor current (Torque). THERMAL DERATING 6.0 (W) 5.0 3.1W using I-type board Power Dissipation (Pdp) 4.0 2.9W using J-type board 3.0 4.1W using H-type board 2.0 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 2.9W at least. And it comes to 4.1W by using an improved 2 layer board. The information of the H, I, J type board is shown in the board information. 1.0 0 25 50 75 100 ) 125 150 Ambient Temperature Ta ( MITSUBISHI 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. Hw+ Hall inputs V U Hv+ Hu+ Hall elements V U U Outer loator W V U U W V REVERSE EC > ECR W V SOURSE W V W Output current SINK U W V U W FORWARD EC < ECR Figure 2. HALL AMPLIFIER INPUT SENSITIVITY SELECT MODE4 OPEN or HIGH 120 degree soft switching The hall amp minimum input voltage is 50mVp-p. GND 120 degree switching ** Io current changes sharply. The hall amp minimum input voltage is 35mVp-p. 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. Figure 3. SLEEP MODE FUNCTION START / STOP ( 41 pin) LOW or OPEN HIGH Figure 4 shows the sleep mode function. If the 41 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 (please refer to the electrical characteristics), and the hall bias output will be cut off. When the 41 pin input is high, all the circuits will work. Motor Stop Bias off Hall-Bias off Motor on Bias on Hall-Bias on Figure 4. MITSUBISHI M56784FP 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 Hystelesis Hw+ Hu+ Hv+ D T Q RDS High Low RDS D T Q High Low FG High Low High FG Low Figure 5. MITSUBISHI M56784FP 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. 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 AUTOMATIC STOP GND UN-AUTOMATIC (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 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 LOW or OPEN LOW or OPEN HIGH COMMUTATED SHORT BRAKING HIGH SHORT BRAKING (2) ALL SHORT BRAKING OUTPUT OPEN [only inertia] MODE2 REVERSE BRAKING Figure 7. MITSUBISHI 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 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 +600mA ALL SHORT BRAKING REVERSE BRAKING MOTOR CURRENT [ Rsense = 0.5 ohm] +600mA -600mA MOTOR STOP -600mA MOTOR STOP (Vbemf-Vd-Vsat) / Ra Vd ; diode voltage Vsat ; npn transistor saturation voltage Ra ; motor inner resistance Figure 8. MITSUBISHI M56784FP 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 11.5 0.76 11.0 0.79 0.86 0.89 0.91 0.98 1.05 Top side saturation voltage 1.18 Output Voltage (V) 10.5 This device can use this voltage value due to motor drive. 1.5 1.0 0.38 0.07 0 0 200 400 600 Load current (mA) 800 1000 1200 0.13 0.25 0.32 0.49 0.62 0.76 0.5 Bottom side saturation voltage 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 0.29 0.06 4.5 0.12 0.23 0.35 0.47 0.62 Top side saturation voltage 4.0 0.83 Output Voltage (V) 3.5 This device can use this voltage value due to motor drive. 1.5 1.0 0.38 0.07 0 0 200 400 600 Load current (mA) 800 1000 1200 0.13 0.25 0.32 0.49 0.62 0.76 0.5 Bottom side saturation voltage MITSUBISHI M56784FP 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 M56784FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT com control Forward reverse rotation signal BRAKING MODE SELECT 0 to 1.5 10uF 36 37 40 39 27 28 6 7 12V Motor power supply FG signal 5V SENSE FG RDS BRAKING MODE CHANGE Hall bias resistor 20 + 4 Hu 19 18 - 104 120 MATRIX + 104 3 Hv 17 16 + 104 2 Hw 15 23 Hall Bias TSD 41 Start / Stop 104 38 26 V/I Converter I/I Converter ++ Motor current sense resistor 5 Control PWM1 0.5 Vlim 25 24 Reference PWM2 8 to 14 and 29 to 35 5V Power Supply 10uF |
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