Datasheet > AH287Z4-G1

AH287Z4-G1

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
BCDSEMI		/
页数	文件大小	规格书
12页	330K
描述
TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION

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AH287Z4-G1 数据手册

Preliminary Datasheet

TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION

AH287

Operating Diagram (Note 3)

Hall Input

OFF

Motor Output

Clamp

Voltage

Comparator

Voltage

Motor lock

cleared

Motor locked

T_OFF

T_ON

Reverts to normal operation

Motor lock detected

Note 3: The automatic restart circuit detects a motor lock condition and automatically turns off the output current.

When the lock is cleared, the IC automatically restarts and allows the motor to run. In AH287, automatic restart

is performed in the following manner. A motor lock condition is detected when the Hall signal stops switching.

The output is ON when CT pin is being charged, and OFF when CT pin is being discharged.

C *(V^CL− V^CP

)

(Sec)

ICHG

C *(V^CL− V^CP

)

OFF

IDHG

Output ON time (T_ON) and OFF time (T_OFF) are determined by C, the capacitance of the CT pin external

capacitor.

_CLis the CT pin clamp voltage

_CPis the CT pin comparator voltage

_CHGis the CT pin charge current

I_DHGis the CT pin discharge current

Figure 13. Control Timing Diagram of AH287

May 2008 Rev. 1. 0

BCD Semiconductor Manufacturing Limited

1...7 8 91011 12

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