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AP3842 Datasheet(PDF) 6 Page - Anachip Corp

Part No. AP3842
Description  High Performance Current Mode PWM Controller
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Maker  ANACHIP [Anachip Corp]
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AP3842 Datasheet(HTML) 6 Page - Anachip Corp

   
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High Performance Current Mode PWM Controller
AP3842/3/4/5
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct.11, 2004
6/8
Shutdown of the AP3842 can be accomplished in two ways; either raise pin 3 above 1V or pull pin 1 below a
voltage two diode drops above ground. Either one of them 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 shutdown condition at pins 1 and/or 3 is removed. In one example, an externally
latched shutdown may be accomplished by adding an SCR that will be reset by cycling Vi below the lower
UVLO threshold. At this point the reference turns off, allowing the SCR to reset.
Figure 7 : Slope Compensation.
8
3
4
Uref
RT/CT
Isense
CT
RT
R1
R2
C
Rsense
Isense
0.1uF
AP3842/3
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.


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