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AP3845S8LA Datasheet(PDF) 6 Page - Anachip Corp |
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AP3845S8LA Datasheet(HTML) 6 Page - Anachip Corp |
6 / 8 page 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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