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M54543AL

Bi-DIRECTIONAL MOTOR DRIVER WITH BRAKE FUNCTION AND THERMAL SHUT DOWN FUNCTION

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (AV COMMON)

M54543AL

Bi-DIRECTIONAL MOTOR DRIVER

WITH BRAKE FUNCTION AND THERMAL SHUT DOWN FUNCTION

PRECAUTIONS FOR APPLICATION

(1) If the motor resistance is high (small output current: several

tens of mA at a light load) and Vcc is greater than Vcc' in

application examples 2) and 3), current may counter-flow from

the Vcc pin to the Vcc' pin.

The motor can work at a light load even when the Vcc' pin is

opened. For light-load applications, use the M54544AL.

The thermal protection of the IC may not work depending on an

abnormal condition (such as oscillation, low supply voltage or

output short). When using the function, check its operation in

the actual using state.

If the motor has a large counter electromotive force at a braking

time, etc., the internal parasitic Di may malfunction.

If fly-back current of 1A or more flows, put a shottkey Di

between the output and the GND.

Remember that the IC has an about 10µs delay in output

switching for high-speed applications such as PWM.

(2) As far as motor control and driver IC's are concerned, some

possibilities are considered for these IC's to cause such

unexpected cases as fire or smoke if they are used beyond its

ratings in datasheet or used, even transiently, under the

overload conditions. So your action will be highly appreciated to

fully look into the rating limits and the using conditions before

you use these IC's.

And if these IC's are to be used under the conditions out of our

specifications, please never fail to give us a contact as to under

what conditions they are used.

APPLICATION EXAMPLES

1) Motor speed control by VCC and VCC'

R2=3Ω

VB

R1=2Ω

C

10 to 100µF

M

INPUT 1

INPUT 2

987654321

M54543AL

2) Motor speed control by the VCC'

VCC

2Ω

C

10 to 100µF

C

1 to 10µF

INPUT 2

M

INPUT 1

987654321

M54543AL

3) Motor speed control by the VCC

VCC'

C

10 to 100µF

INPUT 2

2Ω

M

1 to 10µF

C

INPUT 1

987654321

M54543AL

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