BA6970 데이터 시트보기 (PDF) - ROHM Semiconductor

부품명

상세내역

일치하는 목록

BA6970

2-phase motor driver for VCR cylinder motors

ROHM Semiconductor 

Motor driver ICs

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 ECI input current or the ECV

input voltage (ECI and ECV are output current control pins).

The motor rotational speed is sensed by the FG, and the

output from which is F / I-converted and supplied to the

ECI pin or F / V-converted and supplied to the ECV pin as

a feedback signal, so that a constant rotational speed is

maintained as follows (Fig. 6) :

(1) The motor speed decreases.

(2) The speed control IC outputs a feedback signal

(3) The Hall amplifier gain increases.

(4) The output current increases.

(5) The motor speed increases.

BA6970FS

(2) When the voltage on Hall INφ1 ()) is higher than the

voltage on Hall INφ1 (*), an output current flows from

OUT1 ()) to OUT1 (*) according to the voltage differen-

tial. When the voltage on Hall INφ1 (*) is higher, on the

other hand, an output current flows from OUT1 (*) to

OUT1 ()).

Similarly, when the voltage on Hall INφ2 ()) is higher than

the voltage on Hall INφ2 (*), an output current flows from

OUT2 ()) to OUT2 (*) according to the voltage differen-

tial. When the voltage on Hall INφ2 (*) is higher, on the

other hand, an output current flows from OUT2 (*) to

OUT2 ()).

Fig.6

Fig.7

Fig.8

599

Share Link: