BA6809F 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6809F

2-phase half-wave motor driver

ROHM Semiconductor 

Motor driver ICs

FCircuit operation

The BA6809F and BA6819AF have motor lock detection

and automatic restart circuits. The timing of lock detec-

tion and automatic restart is determined by the external

capacitor connected to the LD pin. The charge time of the

external capacitor is given by :

ton (Charge time)=

toff (Discharge time)=

C S (VLDCL*VLDCP)

ILDC

C S (VLDCL*VLDCP)

ILDD

BA6809F / BA6819AF

(Typical value)

where

VLDCL is the LD-pin clamp voltage

(1.90V),

VLDCP is the LD-pin comparator voltage (0.73V),

ILDC is the LD-pin charge current

(2.2µA),

ILDD is the LD-pin discharge current (0.42µA),

C is the capacitance of the LD-pin external capacitor.

For C=0.47µF, for example, the charge and discharge

times are 0.25s (output ON) and 1.31s (output OFF), re-

spectively.

FApplication example

709

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