Document
FUJITSU SEMICONDUCTOR DATA SHEET
DS04-29113-4E
ASSP
BIPOLAR
1A Motor Drive IC for Motor Applications
MB3853
s DESCRIPTION
The FUJITSU MB3853 is a motor drive IC with two power driver channels capable of sink/source operation, for use in two-channel independent operation or H-type drive operation. The control system and output system have independent power supplies, allowing the control system to be set to low-voltage operation to conserve power. Protective circuits are provided for temperature, overvoltage, and overload current, with an open collector type monitoring terminal. The MB3853 is designed for use with motors in AV products, office automation products, or cameras, and is also an ideal IC for use in automated vending equipment and other unmanned operating devices.
s FEATURES
• Circuit configuration Two sets of built-in control circuits and power circuits Built-in fly-back diode • Functions Can drive two motors independently or in H-type drive configurations Built-in inhibitor function
s PACKAGE
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Plastic SIP, 9 pins
(SIP-9P-M02)
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MB3853
(Continued) • Input/output terminals Power supply terminals : Independent control system supply terminal and output system supply terminal Control terminals : TTL level/CMOS level compatible Monitor terminal : Open collector type • Space-saving package (SIP9)
s PIN ASSIGNMENT
(FRONT VIEW)
VCC1 IN1 IN2 OUT2 GND OUT1 INH VCC2 MONITOR
1 2 3 4 5 6 7 8 9
(SIP-9P-M02)
s PIN DESCRIPTION
Pin no. 1 2 3 4 5 6 7 8 9 Symbol VCC1 IN1 IN2 OUT2 GND OUT1 INH VCC2 MONITOR I/O I I O O I O Description Control system power supply terminal Load control signal input terminal 1 Load control signal input terminal 2 Load control output terminal 2 Ground terminal Load control output terminal 1 Inhibitor signal input terminal Output system power supply terminal Protective circuit motor signal output terminal (open collector type terminal)
2
MB3853
s BLOCK DIAGRAM
VCC1 1 VCC2 8
INH 7
Power supply circuit (ON/OFF)
IN1
2
6 OUT1
IN2
3
4 OUT2
Temperature protection circuit 9 MONITOR (open collector terminal) Overvoltage protection circuit Overload current protection circuit
Timer circuit
5 GND
3
MB3853
s FUNCTIONAL DESCRIPTION
The MB3853 provides two methods for controlling motors. The IC can be connected to two motors and drive each motor independently, or connected to one motor in an H-type connection and drive the motor in forward and reverse directions.
1. Sample connection to 2 motors for run-stop control.
(1) Connection diagram
100 µF *1 − + VCC1 1 8 VCC2 Run-stop control
INH
7
Power supply circuit
M2 SW1 SW2 6
M3
IN1
2
Control circuit
OUT1 *2
SW3 IN2 3 Control circuit SW4 4
OUT2 *2 M2′ M3′ Run-stop control
Protective circuits 5
9 MONITOR
GND
*1 : The capacitor should be placed close to the IC terminal. *2 : When using the M2’ and M3’ terminals, ensure that the OUT1 terminal (p.