BA6870S Rohm, BA6870S Datasheet
BA6870S
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BA6870S Summary of contents
Page 1
... BA6870S The BA6870S 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 ...
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... Motor driver ICs FBlock diagram BA6870S 667 ...
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... 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. BA6870S ...
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... This circuit monitors the output voltage and maintain the operation of the output transistors below their saturation levels. Operating the transistors in the linear characteris- tic range provides good control over a wide range of cur- rent and good torque characteristics even during over- loading. BA6870S 669 ...
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... Motor driver ICs (6) Series regulator The BA6870S has a series regulator output pin. The IC outputs a sink current according to the HIGH level output voltage detected. As shown in Fig. 7 the regulator circuit reduces the power consumed by the IC by reducing the collector-to-emitter (C-E) voltage of the driver transistors. ...
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... Motor driver ICs FApplication example FElectrical characteristic curves BA6870S 671 ...
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... Motor driver ICs FExternal dimensions (Units: mm) 672 BA6870S ...