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UC3842A Datenblatt(PDF) 7 Page - Unisonic Technologies

Teilenummer UC3842A
Bauteilbeschribung  CURRENT MODE PWM CONTROL CIRCUITS
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Hersteller  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3842A Datenblatt(HTML) 7 Page - Unisonic Technologies

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UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
7 of 9
www.unisonic.com.tw
QW-R103-002.F
SHUTDOWN TECHNIQUES
8
3
1k
Ω
1
Shutdown
To current
Sense resistor
Shutdown
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.


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