參數(shù)資料
型號: UC3842AL-S08-T
廠商: UNISONIC TECHNOLOGIES CO LTD
元件分類: 穩(wěn)壓器
英文描述: CURRENT MODE PWM CONTROL CIRCUITS
中文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝: LEAD FREE, SOP-8
文件頁數(shù): 7/9頁
文件大?。?/td> 106K
代理商: UC3842AL-S08-T
UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 9
QW-R103-002,D
S HUT DOWN T ECHNIQUES
8
3
3
5
1k
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 V
CC
below the lower UVLO threshold. At this point the
reference turns off allowing the SCR to reset
.
相關PDF資料
PDF描述
UC3842A-S08-R CURRENT MODE PWM CONTROL CIRCUITS
UC3842A-S08-T CURRENT MODE PWM CONTROL CIRCUITS
UC3843A-D08-T CURRENT MODE PWM CONTROL CIRCUITS
UC3843AL-D08-T CURRENT MODE PWM CONTROL CIRCUITS
UC3843AL-S08-R CURRENT MODE PWM CONTROL CIRCUITS
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