M54687FP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M54687FP

Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M54687FP

Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR

CAUTIONS

(1) Oscillation may take place with the setting of RT>K•Ra. Set

R K•Ra.

(2) Add a capacitor of 0.1µF to the portion between PSCs to

reduce brush noise of the motor.

(3) Add a capacitor of 10µF to the portion between VCC and GND

to reduce brush noise and back electromotive noise of the

motor.

(4) At a low temperature, RT>K•Ra is set due to temperature

characteristics of resistance Ra of the motor. When oscillation

takes place, use resistance with a temperature coefficient for

RT.

(5) When the supply voltage is low, note that saturation of the

output transistor of the IC may prevent the rotating speed for

control. Taking into account motor noise etc., set constants in

the following range.

2.0V

=

VCC

VCC

-

-

(EC+Ia • Ra)

{RT • IB + Vref(1+

RT

RS

)+

RT

K

• Ia}

When the back electromotive force is large with the brakes applied,

for example, malfunction may occur in internal parasitic Di. If

flyback current of 1A or more flows, add Schottky Di to the portion

between the output and the GND.

When the IC is used at a high speed for PWM etc., note that

switching of output results in delay of approx. 10µs.

TYPICAL CHARACTERISTICS

Thermal Derating (Absolute Maximum Rating)

2.0

1.5

When mounted in board

1.0

0.5

0

0

25

50

75

100

Operating Temperature Ta (˚C)

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