UC3842A 查看數據表（PDF） - Unisonic Technologies

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UC3842A

CURRENT MODE PWM CONTROL CIRCUITS

Unisonic Technologies 

UC3842A/3843A

SHUTDOWN TECHNIQUES

LINEAR INTEGRATED CIRCUIT

1kΩ

8

1

Shutdown

3

Shutdown

To current

Sense resistor

Shutdown UTC UC3842A can be accomplished by two methods; either raise pin 3 above 1V or pull Pin 1 below a

voltage two diode drops above ground. Either method caused the output of PWM comparator to be high(refer to

block diagram).The PWM latch is reset dominant so that the output will remain low until the next clock cycle after the

shutdown condition at pins 1 and/or 3 is removed . In one example, an externally latched shut –down may be

accomplished by adding an SCR which be reset by cycling VCC below the lower UVLO threshold. At this point the

reference turns off allowing the SCR to reset.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

7 of 9

QW-R103-002,D

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