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MITSUBISHI
M56748FP
4-CHANNEL ACTUATOR MOTOR DRIVER
DESCRIPTION
The M56748FP is a semiconductor IC developed as the motor driver used to CD player, CD-ROM. This circuit includes Standby circuit, TSD circuit and 4-Channel BTL Driver that is able to drive four actuator with one IC.
PIN CONFIGURATION (TOP VIEW)
Vref - in Vref - out N.C 1 2 3 4 5 6 7 8 36 35 34 33 32 31 30 29 28 GND 27 26 25 24 23 22 21 20 19 VM3(+) VM3(-) Vctl3(out) Vctl3(-) Vctl3(+) Vcc Regbase Standby SS . GND Standby Gain4 Vctl4(-) VM4(-) VM4(+)
FEATURES
qLow Output saturation voltage (typ:1.35V,at 0.5A) qLarge Operating supply voltage range (4.5 - 15V) qMinimum Crossover distortion
Gain1 Vctl1(-) VM1(-) VM1(+)
M56748FP
APPLICATION
CD player, CD-ROM, Video CD
GND
9 10 11 VM2(+) VM2(-) Vctl2(-) Gain2 N.C Vcc Reg5V 12 13 14 15 16 17 18
Outline 36P2R-D
N.C : no connection
BLOCK DIAGRAM
Vref- out 2 Gain1 4 Vctl1(-) 5 VM1(+) 7 Vref - in 1 Vcc Vcc 17 20 Regbase Reg5V 19 18
+ -
+ + -
+
+ + CH4 +
33 Gain4 32 Vctl4(-) 30 VM4(+) 31 VM4(-) 21Vctl3(+) 22 Vctl3(-) 23 Vctl3 out
+ CH1 + + + TSD
VM1(-) 6
Gain2 15 Vctl2(-) 14 VM2(+) 12 VM2(-) 13
1,3,4ch
Stand by
+ CH2 +
34 Standby 36 Standby 35 SS.GND 8 , 9 ,10,11,26,27,28,29 PGND ( 8PIN)
+ CH3 +
25 VM3(+) 24 VM3(-)
MITSUBISHI
M56748FP
4-CHANNEL ACTUATOR MOTOR DRIVER
PIN DESCRIPTIONS
Pin No.
1 2 3 4 5 6 7 8
to
12 13 14 15 16 17 18
11
Symbol Vref-in Vref-out N.C Gain1 Vctl1(-) VM1(-) VM1(+) GND VM2(+) VM2(-) Vctl2(-) Gain2 N.C Vcc Reg5V
Function Reference voltage input terminal Reference voltage output terminal CH1 amp. gain control terminal CH1 amp. inverted input terminal CH1 amp. inverted output terminal CH1 amp. non-inverted output terminal GND CH2 amp. non-inverted output terminal CH2 amp. inverted output terminal CH2 amp. inverted input terminal CH2 amp. gain control terminal Power supply Connects the collector of external PNP
Pin No.
19 20 21 22 23 24 25 26
to
30 31 32 33 34 35 36
29
Symbol Reg-base Vcc Vctl3(+) Vctl3(-) Vctl3(out) VM3(-) VM3(+) GND VM4(+) VM4(-) Vctl4(-) Gain4 Standby SS. GND Standby
Function Connects the base of external PNP Power supply CH3 amp. non-inverted input terminal CH3 amp. inverted input terminal CH3 input amp. output terminal CH3 amp. inverted output terminal CH3 amp. non-inverted output terminal GND CH4 amp. non-inverted output terminal CH4 amp. inverted output terminal CH4 amp. inverted input terminal CH4 amp. gain control terminal L standby input terminal Small signal GND H standby input terminal
ABSOLUTE MAXIMUM RATINGS (Ta=25C)
Symbol Vcc Io Vin Pt K Tj Topr Tstg Parameter Condition 17 , 20 pin Supply Voltage Output Current Maximum Input Voltage of each Terminals 1 , 4 , 5 , 14 , 15 , 22 , 23 , 32 , With infinite heatsink Power Dissipation With infinite heatsink Thermal derating Junction temperature Operating temperature Storage temperature Rating 15 700 0 - Vcc 4.5 27.8 150 -20 - 75 -40 - 125 Unit V mA V W C/W C C C
33 , 34
, 36 pin
RECOMMENDED OPERATING CONDITIONS
Symbol Vcc IO Supply voltage Output current Parameter Min. 4.5 Limits Typ. 5.0 Max. 5.5 500 Unit V mA
ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=5V, unless otherwise noted)
Symbol Icc1 Vsat Vofs 1 Vofs 2 Gv Standby Standby Parameter Circuit current on no-signal Output saturation voltage Output offset voltage-1 Output offset voltage-2 Voltage gain between input and output H standby-on voltage H standby-off voltage L standby-on voltage L standby-off voltage Test conditions Vref=Vctl=2.5V Top and Bottom saturation voltage of output power Tr. Load Current Io=0.5A CH1, 2, 4, Vref=Vctl=2.5V CH3, Vref=Vctl=2.5V CH1, 2, 4 CH3 uses input amp. as a buffer. CH1, 3, 4 = Standby ON CH1, 3, 4 = Standby OFF CH1, 3, 4 = Standby ON, 18 pin = 5V CH1, 3, 4 = Standby OFF, 18 pin = 5V -35 -57 7.60 13.6 2.0 Min. Limits Typ. 15 1.35 Max. 25 1.90 +35 +57 9.35 15.4 0.8 2.0 4.0 Unit mA V mV dB V V V V
8.52 14.54
MITSUBISHI
M56748FP
4-CHANNEL ACTUATOR MOTOR DRIVER
EXPLANATION OF OPERATION 1. The characteristics between Control voltage and Output voltage
CH1, CH2, CH4 AMP. The input Amp. (Vctl terminal) consists of the Inverted Amp. and the output (VM+, VM-) is amplified by the different voltage between Vref and Vctl. The voltage gain of this input Amp. is 1 time. Also, the output Amp. is the Master-Slave constitution. Each of Master Amp. (VM+) and Slave Amp. (VM-) have the gain of 1.33 times and the output voltage refer to the about Vcc/2. CH3 AMP. The three terminals (Inverted, non-inverted and output) of Input Amp. go to external pins. So, the Amp. constitution (for example, Buffer Amp.) and the Gain can be adjusted by the external resistors. The output Amp., is the same with CH1, 2 and 4, is consisted of the Master-Slave Amp. Each of the MasterAmp. (VM+) and Slave Amp. (VM-) have the gain of 2.66 and the output voltage refer to the about Vcc/2.
Output of non-inverted Amp. (Gain=1.33) Vref + CH1 Gain Vctl 10k 10k Input of inverted Amp. (Gain=1) Output of inverted Amp. (Gain=1.33) + + VM+ VM+ Vref +
Output of non-inverted Amp. (Gain=2.66) + CH3 + + VMVM+
Vctl+ VctlVctlout Input Amp. (sets gain externally)
Output of inverted Amp. (Gain=2.66)
CH1, 2, 4 Amp.
Vctl Vref (2.5V) 1V
CH3 Amp. (uses input Amp. as a Buffer Amp.)
0.5V Vref (2.5V)
Vctl+
VM1.33V = Vcc/2 1.33V
VM+
VM+ 1.33V = Vcc/2 1.33V
VM-
Gain=
2.66V 1V
Gain=
2.66V 0.5V
= 2.66 TIMES = 8.5 db
= 5.32 TIMES = 14.5 db
MITSUBISHI
M56748FP
4-CHANNEL ACTUATOR MOTOR DRIVER
TYPICAL CHARACTERISTICS
Output saturation voltage-Load current characteristics (Vcc=5V) (V) Output voltage 5
Top side saturation voltage 0.84 0.89 0.95
4
1.00
1.05
Output H voltage
3
The voltage range that is able to drive a motor
2
1
Output L voltage 0.06 0.12 0.18 0.24 0.30
Bottom side saturation voltage
100
200
300
400
500
FREQUENCY CHARACTERISTICS
(dB) 40 GAIN 20
(mA) Load current (deg) 180 PHASE 90
GAIN(8.5dB)
0
PHASE
0
-20
-90
-40 0.03 0.06 0.1 0.3 0.6 1 3 6 10 FREQUENCY (KHZ) 30 60 100 300 600
-180
THERMAL DERATING
Power Dissipation (Pdp) (W)
5.0 4.5 4.0
With infinite heatsink
Without heatsink
3.0 2.0 1.2 1.0
0
25 50 75 100 125 Ambient Temperature (Ta) (C)
150
MITSUBISHI
M56748FP
4-CHANNEL ACTUATOR MOTOR DRIVER
Application Example
15K Vref-in 1 2.5V Vref 2 Vref-out N.C 3 4 VCTL 5 Pre-driver Pre-driver 6 7 8 9 GND 10 11 GND 27 26 VM2(+) 12 M 13 14 10K 15 16 17 7.5V Vcc 18 Reg5V 3R R Regbase 5V 1uF 19 Gain2 N.C Vcc 10K
OP1
+ OP1 -
TSD
Stand by
23K 23K
36 2K 15K 35 34
Standby
SS.GND
5K Gain1 10K
+ -
5K
+ -
Standby
OP1
OP1
Gain4 10K
33 32 VCTL
10K
10K
Focus
VM1(-) VM1(+)
PA
+ +
+ PA PA +
VM4(-) VM4(+)
31 30 29 28
Tracking
PA
Slide
Pre-driver
Pre-driver
PA
+ -
+ PA PA +
VM3(+)
Spindle
25 M 24 0.022uF 23 22 21 82K 560K pwm1 20 82K 0.022uF 560K pwm2
VM2(-)
PA +
VM3(-) Vctl3(out) Vctl3(-)
VCTL
+
OP1
Vcc 5K
OP1 +
+
Vctl3(+) 10K + 10K Vcc
10uF

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