BA6870 データシートの表示（PDF） - ROHM Semiconductor

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BA6870

3-phase motor driver

ROHM Semiconductor 

Motor driver ICs

FPin descriptions

BA6870S

FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC1 = 5V, VM = VCC2 = 12V)

FCircuit operation

(1) Pseudo-linear output and torque ripple cancellation

The IC generates a trapezoidal (pseudo-linear) output

current, whose waveform phase is 30 degrees ahead of

that of the Hall input voltage (Fig. 1).

The trapezoidal waveform of output current would create

intermittence in the magnetic field generated by the

3-phase motor, and would result in an irregular rotation

of the motor. To prevent this, the output waveform is ob-

tained by superimposing a triangular wave on the trape-

zoidal wave (Fig. 2). This process is called torque ripple

cancellation.

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