UC3842A-D08-T UTC [Unisonic Technologies], UC3842A-D08-T Datasheet - Page 7

• Manufacturer Part Number: UC3842A-D08-T
• Description: CURRENT MODE PWM CONTROL CIRCUITS
• Manufacturer: UTC [Unisonic Technologies]

UC3842A/3843A
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 V
reference turns off allowing the SCR to reset
SHUTDOWN TECHNIQUES
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Shutdown
1kΩ
.
Sense resistor
To current
8
3
Shutdown
CC
below the lower UVLO threshold. At this point the
LINEAR INTEGRATED CIRCUIT
1
QW-R103-002,D
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