33 W (60 W Peak) Pvr Power Supply

The fl yback converter shown in Figure 1 uses a member of the PeakSwitch family (U6, a PKS606PN) to supply 33 W continuously and peak power pulses of up to 60 W. The controller in U6 receives feedback from the secondary through U5, and based on that feedback, enables or disables the switching of its integrated MOSFET to maintain regulation. A portion of both the 3.3 V and the 5 V outputs are fed into the TL431 (U2), which controls the current through the LED in U5. As the 3.3 V or the 5 V output voltages rise above their set-point thresholds, U2 pulls additional current through the LED in U5. This in turn increases the base drive to Q1, increasing the current pulled out of the EN/UV pin of U6. Switching cycles are skipped once the EN/UV disable threshold current is exceeded. When the current out of the EN/UV pin falls below the disable threshold, switching cycles are re-enabled.
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33 W (60 W Peak) Pvr Power Supply application circuits
33 W (60 W Peak) Pvr Power Supply application circuits



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