ROHM BA6871BS Datasheet

Motor driver ICs

3-phase motor driver

BA6871BS

The BA6871BS is a 3-phase, full-wave, pseudo-linear motor driver suited for VCR capstan motors. The IC has a torque
ripple cancellation circuit to reduce wow and flutter, and an output transistor saturation prevention circuit that provides
superb motor control over a wide range of current. The built-in motor power series regulator allows applications with low
power consumption.

Applications
3-phase VCR capstan motors

Features

1) 3-phase, full-wave, pseudo-linear driver system.

2) High performance torque ripple cancellation circuit.

3) Reversal braking by detecting the motor direction.

4) Saturation prevention circuit for high- and low-side
output transistors.

5) Motor power supply series regulators.

6) Built-in circuit for output-to-GND short-circuit detec­tion.

7) Two FG amplifiers.

8) Available in a SDIP 32-pin power shrink package.

Absolute maximum ratings (Ta = 25C)

Recommended operating conditions (Ta = 25C)

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Motor driver ICs BA6871BS

Block diagram

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Motor driver ICs BA6871BS

Pin descriptions

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Motor driver ICs BA6871BS

Input/output circuits
(1) Driver output

(2) Hall input (3) ED/S

(4) Torque control input (5) Torque limit and current sensing

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