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參數(shù)資料
| 型號(hào)： | LM3842A |
| 廠商： | TAEJIN Technology Co., Ltd. |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 121K |
| 代理商： | LM3842A |
CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
Fig.6 Shutdown Techniques
Shutdown of the LM3842A 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 causes the output of the
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 shoutdown condition at pins 1 and/or 3
is removed. In one example, an externally latched shutdown may be accomplished by adding an
SCR which will be reset by cycling V
CC
below the lower UVLO threshold. At this point the
reference turns off, allowing the SCR to reset.
Fig.7 Slope Compensation
A fraction of the oscillator ramp can be resistively summed with the current sense signal to
provide slope compensation for converters requiring duty cycles over 50%.
Note that capacitor, C, forms a filter with R2 to suppress the leading edge switch spikes.
HTC
5
1
SHUTDOWN
COMP
8
3
V
REF
I
SENSE
1K
330Ω
500Ω
SHUTDOWN
TO CURRENT
SENSE-RESISTOR
8
4
3
I
SENSE
R2
V
REF
R
T
/C
T
0.1μF
R
T
C
T
R1
R
SENCE
C
I
SENSE
LM3842A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3842A_08 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
| LM3842AD | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
| LM3842AN | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
| LM3843A | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
| LM3843AD | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
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