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MITSUBISHI
M56755AFP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56755AFP is a semiconductor integrated circuit designed for a single chip controller for CD-ROM spindle motor. M56755AFP has a both (forward and reverse) motor torque control by the motor speed control terminal. M56755AFP has the several braking mode that an user can flexibly select in order to generate the reverse torque. Also, this device includes a bias circuit for Hall Sensor, a current limit circuit and a thermal shut down function.
PIN CONFIGURATION (TOP VIEW)
S/S RDS FG CI MODE2 MODE1
1 2 3 4 5 6 7 8 9
36 35 34 33 32 31 30 29 28
W V U RS MODE3 MODE4
FEATURES
q 3.3V DSP available. q The supply voltage with wide range. (4.5V to 13.2V) q High motor drive current (1.2A). q Motor current control for the both motor torque is possible. q Reverse torque mode select [SHORT BRAKING, etc] q Sleep mode q Hall amplifier sensitivity select q Automatic stop select (with reverse detected signal pin)
M56755AFP
GND 10 11 12 VM VCC2 EC ECR VCC1 HB 13 14 15 16 17 18
GND 27 26 25 24 23 22 21 20 19 HwHw+ HvHv+ HuHu+
APPLICATION
Above 8 times speed CD-ROM, DVD, DVD-ROM etc.
Outline 36P2R-D
BLOCK DIAGRAM
U 34 V 35 W 36 S/S 1 RS 33 VCC1 17
VM VCC2
13 14 ++ I/I Converter 120 MATRIX SENSE TSD Vref 7 to 12 GND
MODE1
6
MODE2
5
BRAKING MODE CHANGE
25 to 30
GND
MODE4
31
MODE3 FG RDS
32 3 2 19 Hu+ 20 Hu21 Hv+ 22 Hv23 Hw+ 24 Hw18 HB CI 4 FG RDS + + + Hall Bias
V/I Converter
15 EC
16 ECR
MITSUBISHI
M56755AFP
SPINDLE MOTOR DRIVER
PIN FUNCTION
Pin No.
1 2 3 4 5 6 7
Symbol S/S RDS FG CI MODE2 MODE1 GND VM VCC2 EC ECR VCC1 HB
3
Function 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 pin[FG] are with pull-up resistor (10kohm).
Pin No.
19 20 21 22 23 24 25
Symbol Hu+ HuHv+ HvHw+ HwGND MODE4 MODE3 RS U V W
Function 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
- 12
13 14 15 16 17 18
-
31 32 33 34 35 36
30
*The
2
pin[RDS] and
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
13 14
Conditions pin maximum input voltage pin maximum input voltage 17 pin maximum input voltage *Note 1
19
Rating 16 16 7.0 1.5 4.5 1.2 9.6 150 -20 - +75 -40 - +125
Units V V V A V W mW/C C C C
-
24
pins
Free Air Free Air
*Note1; There is no overing Pt (power dissipation) or the area of safety operation.
MITSUBISHI
M56755AFP
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 Vsat ECdeadECdead+ ECR EC Gio Vlim VH com VHmin1 VHmin2 Parameter Sleep Mode Supply current - 1 Sleep Mode Supply current - 2 Supply current - 3 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 revel
13 17
Conditions and
14
pin total Input Current [
1
pin lo or open]
pin Input Current [ 1 pin lo or open] 17 pin Input Current (EC = ECR = 2.5V) [ 1 pin Hi] Top and Bottom saturation voltage Load current 500mA EC < ECR EC > ECR 16 pin Input voltage range [3.3V DSP available] 15 pin Input voltage range [3.3V DSP available] Io = Gio / Rsense [A/V] Ilim = Vlim / Rsense [A]
19
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 -- -- --
Max. 100 500 6.0 1.9 0 +40 4.0 4.0 0.35 0.33 4.5 -- --
Units A A mA V mV V V V/V V V mVp-p
- -
24
pins input range pins input signal MODE4 = open MODE4 = GND
19
24
50 35
MITSUBISHI
M56755AFP
SPINDLE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS (VCC = 5V, VCC2 = 12V ,VM = 12V, Ta = 25C unless otherwise noted.)
Symbol VHb IHb Parameter Hall bias terminal output voltage Hall bias terminal sink current
1
Conditions Load current (IHb) 10mA.
Min. 0.6 --
Limits Typ. 0.85 --
Max. 1.2 30
Units V mA
Von
Motor start voltage
1
pin input voltage when makes the motor start up. *The ICs will be the active condition. *The hall bias will be available. pin input voltage when makes the motor stop. *The ICs will be the sleep condition. *The hall bias will be off.
2.0
--
--
V
Voff
Motor stop voltage
--
--
0.8
V
ViH
mode pin input high voltage
6 pin [MODE1], 5 pin [MODE2], 32 pin [MODE3] and 31 pin [MODE4] input voltage when makes high level. 6 pin [MODE1], 5 pin [MODE2], 32 pin [MODE3] and 31 pin [MODE4] input voltage when makes low level.
2.0
--
--
V
ViL
mode pin input low voltage
2 pin[RDS], low voltage 3
--
--
0.8
V
VOL
pin[FG] output
at Io current = 1mA
--
--
0.5
V
ELECTRICAL CHARACTERISTICS (VCC=5V, 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 (control voltage), ECR (reference voltage) and the torque is as shown in Figure 1. The current gain is 0.6A/V (at sensing resistor: 0.5ohm) in the both torques and a dead zone is 0mV to 40mV.
Current limit Forward Torque
Figure 1. The characteristics of the control voltage and motor current (Torque).
MITSUBISHI
M56755AFP
SPINDLE MOTOR DRIVER
HALL AMPLIFIER INPUT AND COMMUTATION
The relationship between the hall amplifier inputs voltage and the motor current outputs is as 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 input voltage minimum is 50mVp-p. GND 120 degree switching ** Io current will be shape. The hall amp input voltage minimum is 35mVp-p. Figure 3 shows the hall amplifier input sensitivity select function. An user is able to select the sensitivity of a hall amplifier to match with the hall elements type. If the output minimum level of a hall elements is a low level as below 50mVp-p, please connect the MODE4 to GND at external. In this case, the output current will be shape. If the output minimum level of a hall elements is more higher than 50mVp-p, please make the MODE4 to open, then the output current will be commutated softly. We recommend that the output level of a hall element is used for 80mVp-p to 120mVp-p and the MODE4 is made to open.
Figure 3.
SLEEP MODE FUNCTION
START / STOP LOW or OPEN HIGH Figure 4 shows the sleep mode function. If the 1 pin [S/S] is set to open or low, the current output will be high impedance and then the motor will be stop. Also, the IC bias current wil be a slight current (please make reference the electrical characteristics). At the same time, the hall bias output will be cut off. When the 1 pin goes high, the all of circuits will be available.
Motor Stop Bias off Hall-Bias off
Motor on Bias on Hall-Bias on
Figure 4.
MITSUBISHI
M56755AFP
SPINDLE MOTOR DRIVER
FORWARD AND REVERSE ROTATION DETECT
Figure 5 shows the circuits and function of the forward and reverse rotation detect. The RDS is the output signal pin that detected by the signal of hall inputs (Hu+, Hu-, Hv+ and Hv-). The RDS pin is pulled-up to VCC1 by internal resistor (typ. 10kohm). When the motor is spinning at forward, the RDS pin output will be a low level. When the rotation of motor is reversed at stop mode, it will be a high level.
will continue the reversed rotation. This mode [MODE3=GND] is available for the case that an user hope to control the motor stopping at external.
FG FUNCTION
Figure 5 shows the circuits and function of the frequency generator, too. The FG is the pin that output the signal synchronize with the hall inputs [Hv+ and Hv-] timming. The FG pin is pulled-up to VCC1 by internal resistor [typ. 10Kohm].
AUTOMATICALY STOP AFTER REVERSE BRAK-ING
Figure 5 shows the automaticaly stop circuits after the reverse braking, too. Figure 6 shows its function table. The MODE3 is the input pin in order to be selected either the automaticaly stop or non-stop. When the MODE3 is open, the motor rotation will be stopped automaticaly after the reverse braking in order to make stop the motor. When the MODE3 is connected to GND, the motor MODE3 OPEN or HIGH AUTOMATIC STOP GND UN-AUTOMATIC (NON-STOP)
Figure 6.
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
M56755AFP
SPINDLE MOTOR DRIVER
REVERSE TORQUE MODE SELECT FUNCTION
At the 4 times speed and the 6 times speed CDROM drive system, the reverse braking style has been used for the reverse torque. However, at the 8 times speed CDROM drive system, the motor current will be needed above 0.7A, if an user of driver IC require a high speed access time. If the reverse braking is used at 0.7A, the IC junction temperature will be too much high. Therefore, MITSUBISHI new motor driver has the braking mode select function. This mode select function is available in order to control flexibly in match with the situation of junction temperature. Figure 7 shows the reverse torque mode select function table.
If you hope original (the reverse braking) style, please only select REVERSE BRAKING mode [MODE1 = LOW or OPEN and MODE2 = HIGH] at external. If it is possible to get two more port from com, you can flexibly control the four kinds of BRAKING MODE. If you can only get one more port, you can control only the MODE2. Then, you can control the two kinds of BRAKING MODE [commutated short or reverse] under the MODE1 is set to 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]
Figure 8 shows an example for the reverse torque mode select. The CASE1 is an controlling example for REVERSE and COMMUTATED SHORT BRAKING. The CASE2 is an controlling example for REVERSE and ALL SHORT BRAKING.
MODE2
REVERSE BRAKING
Figure 7.
CASE 1 REVERSE AND COMMUTATED SHORT BRAKING SELECT
EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V] 5.0V 5.0V
CASE 2 REVERSE AND ALL SHORT BRAKING SELECT
EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]
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
M56755AFP
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) If you use a bootstrap as below,it is possible to make low the output saturation voltage. (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
M56755AFP
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)
THERMAL DERATING
6.0 (W) 5.0 Power Dissipation (Pdp) 4.5 4.0 Without heatsink 3.0 With infinite heatsink
2.0 1.2 1.0
0
25
50
75
100
125
150 (C)
Ambient Temperature (Ta)
MITSUBISHI
M56755AFP
SPINDLE MOTOR DRIVER
APPLICATION CIRCUIT
com control Forward reverse rotation signal FG signal BRAKING MODE SELECT 0 to 1.5 10uF 14 13 32 31 6 5 2 3 12V Motor power supply
5V SENSE FG RDS BRAKING MODE CHANGE
Hall bias resistance
19
+ 34
Hu 20 21 -
104 120 MATRIX +
104
35
Hv 22 23 +
104
36
Hw 24 18 Bias Hall TSD
Start / Stop
1
104 4 15 V/I Converter
I/I Converter ++ 33 Motor current sense resistor
Control PWM1 16
0.5
Vlim 17
Reference PWM2 7 to 12 and 25 to 30
5V Power Supply 10uF

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