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LM3842A Datasheet(PDF) 5 Page - HTC Korea TAEJIN Technology Co.

Part No. LM3842A
Description  CURRENT MODE PWM CONTROLLER
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Maker  HTC [HTC Korea TAEJIN Technology Co.]
Homepage  http://www.htckorea.co.kr
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LM3842A Datasheet(HTML) 5 Page - HTC Korea TAEJIN Technology Co.

   
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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 VCC 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
VREF
ISENSE
1K
330Ω
500Ω
SHUTDOWN
TO CURRENT
SENSE-RESISTOR
8
4
3
ISENSE
R2
VREF
RT/CT
0.1μF
RT
CT
R1
RSENCE
C
ISENSE
LM3842A


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