AMC3843B 데이터 시트보기 (PDF) - ADDtek Corp

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AMC3843B

CURRENT MODE PWM CONTROLLER

ADDtek Corp 

AMC3842B/43B/44B/45B

APPLICATION INFORMATION (continued)

1K

VREF

COMP

330Ω

Shutdown

ISENSE

500Ω

To Current

Sense Resistor

Shutdown

Fig. 5. Shutdown Techniques - there are two ways to shutdown the PWM controller: 1) raise the voltage at

ISENSE above 1V or, 2) pull the COMP below a voltage two diodes above ground.

VREF

RT/CT

ISENSE

0.1µF RT

CT

R2

R1

C

ISENSE

RSENSE

Fig 6. Slop Compensation – To achieve duty cycles over 50% for some applications, the above

slope compensation technique is suggested by resistively summing a fraction of the oscillator

ramp with the current sense signal.

Copyright © 2006 ADDtek Corp.

8

DD019_F -- OCTOBER 2006

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