9

Apr. 2007 Rev. 1. 2

BCD Semiconductor Manufacturing Limited

2-PHASE HALF-WAVE HIGH VOLTAGE MOTOR PRE-DRIVER

AM4406

Data Sheet

Operating Diagram

Figure 9. Control Timing Diagram of AM4406

Note 4: 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. C2 is the external capacitor of the CT pin. Output ON time and

OFF time are determined by the capacitance of C2.

Note 5: RD pin is ON during normal operation, and OFF when the motor is locked. It is an open collector output pin.

Note 6: The RD pin may maintain HIGH level for a few hundred milliseconds when the power is turn on.

.)

(

)

(

*

Sec

I

V

V

2

C

T

CHG

CP

CL

ON

−

=

.)

(

)

(

*

Sec

I

V

V

2

C

T

DHG

CP

CL

OFF

−

=

Reverts to normal operation

Motor Lock

Cleared

ON

OFF

Motor Locked

Motor Lock Detected

High

T

ON

T

OFF

Hall Input

Motor Output

CT

RD

A few hundred milliseconds

RD

Power