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BA6825FS Arkusz danych(PDF) 3 Page - Rohm |
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BA6825FS Arkusz danych(HTML) 3 Page - Rohm |
3 / 6 page 582 Motor driver ICs BA6825FS / BA6826FS FInput / output circuits (1) Hall and ECI inputs (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-con- verted and supplied to the ECI pin as a feedback signal, so that a constant rotational speed is maintained as fol- lows : (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 current increases. (5) The motor speed increases. (2) When the voltage on Hall IN φ1 ()) is higher than the voltage on Hall IN φ1 (*), an output current flows from OUT1 ( *) to OUT1 ()) according to the voltage differen- tial. When the voltage on Hall IN φ1 (*) is higher, on the other hand, an output current flows from OUT1 ( )) to OUT1 ( *). Similarly, when the voltage on Hall IN φ2 ()) is higher than the voltage on Hall IN φ2 (*), an output current flows from OUT2 ( *) to OUT2 ()) according to the voltage differen- tial. When the voltage on Hall IN φ2 (*) is higher, on the other hand, an output current flows from OUT2 ( )) to OUT2 ( *). |
Podobny numer części - BA6825FS |
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