2-phase motor driver for VCR cylinder motors
Motor driver ICs
2-phase motor driver for VCR cylinder motors
BA6825FS / BA6826FS
The BA6825FS and BA6826FS are direct-...
Description
Motor driver ICs
2-phase motor driver for VCR cylinder motors
BA6825FS / BA6826FS
The BA6825FS and BA6826FS are direct-drive motor drivers suitable for 2-phase, full-wave linear motors. They consist of a Hall amplifier control circuit and driver circuits. FApplications VCR cylinder motors FFeatures 1) Linear drive system provides low switching noise. 2) Constant supply voltage pin for hall devices. 3) High ratio of output current against control current. (4000 Typ.) FBlock diagram
4) Available in compact surface-mount packages.
580
Motor driver ICs
FAbsolute maximum ratings (Ta = 25_C)
BA6825FS / BA6826FS
FRecommended operating conditions
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V)
FPin descriptions
581
Motor driver ICs
FInput / output circuits (1) Hall and ECI inputs
BA6825FS / BA6826FS
(2)
Coil output
FCircuit operation (1) The signal from the Hall device is amplified by the Hall amplifier and then supplied to the driver circuit. The driver gain, which is constant, is regulated by changing the Hall amplifier gain with the input current on the output current control pin (ECI pin). The motor rotational speed is sensed by the FG, and the output of which is F / I-converted and supplied to the ECI pin as a feedback signal, so that a constant rotational speed is maintained as follows : (1) The motor speed decreases. (2) The speed control IC outputs a feedback signal to the ECI pin. (3) The Hall amplifier gain increases. (4) The output ...
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