M54544AL Datasheet, PDF (1/4 Pages) Mitsubishi Electric Semiconductor – Bi-DIRECTIONAL MOTOR DRIVER WITH BRAKE FUNCTION AND THERMAL SHUT DOWN FUNCTION

MITSUBISHI <CONTROL / DRIVER IC>
M54544AL
Bi-DIRECTIONAL MOTOR DRIVER
WITH BRAKE FUNCTION AND THERMAL SHUT DOWN FUNCTION
DESCRIPTION
The M54544AL is a semiconductor integrated circuit that is
capable of directly driving a smallsize bi-directional motor rotating
in both forward and reverse directions.
FEATURES
qWide range of operating voltage (VCC=4 – 16V)
qPossible direct driving with TTL, PMOS and CMOS IC outputs
qLow output saturation voltage (large voltage across motors)
qBuilt-in clamp diode
qLarge output current drive (IO(max)=±1.5A)
qProvided with brake function
qBuilt-in thermal shutdown protection circuit
APPLICATION
Sound equipment such as tape deck and radio cassette, VTR, and
other general consumer appliances
FUNCTION
The M54544AL is an IC for driving a smallsize bi-directional motor
that rotates in both forward and reverse directions. When both
inputs 1 and 2 are set to low-level, outputs 1 and 2 are set to
“OFF”. When input 1 is set to high-level and input 2 is set to low-
level, output 1 is set to high-level and output 2 is set to low-level
(forward rotation status). When input 1 is set to low-level and input
2 is set to high-level, output 1 is set to low-level and output 2 is set
to high-level (reverse rotation). When both inputs 1 and 2 are set to
high-level, both outputs 1 and 2 are set to low-level (brake status).
The power supply (VCC) to the control circuit and the power supply
(VCC’) for output are independently provided. The rotating speed of
the motor can be therefore changed by using VCC and VCC’ as
different power supplies and by making VCC or VCC’ variable.
If the motor resistance is high (light load and small driving current:
tens of mA), and VCC is larger than VCC’, current does not flow
backward from the VCC pin to VCC’ pin.
PIN CONFIGURATION (TOP VIEW)
Power supply 1 VCC1 1
Output power supply 1 VCC’1 2
Output 2
O2
3
Input 1
IN1
4
GND 5
Input 2
IN2
6
Output 1
O1
7
Output power supply 2 VCC’2
8
Power supply 2 VCC2
9
Outline 9P9
In addition, built-in thermal protection circuit protects the IC from
thermal destruction in case of abnormal condition such as motor
blocking.
LOGIC TRUTH TABLE
Input
IN1
IN2
L
L
H
L
L
H
H
H
Output
O1
O2
Remarks
“OFF” state “OFF” state No operation of IC
H
L
ex Forward rotation
L
H
Reverse rotation
L
L
Brake
BLOCK DIAGRAM
Power supply 1
VCC1
1
Output power supply 1
VCC’1
2
Output 2 Output 1
O2
O1
3
7
Output power supply 2
VCC’2
8
Power supply 2
VCC2
9
Thermal
protection
circuit
Input control
circuit
4
IN1
Input 1
5
GND
6
IN2
Input 2