Summary:
Way of working
TOPSwitch-GX uses current mode feedback to achieve very low no-load power consumption. C16, R1 and Q2 provide a constant current to the TOPSwitch-GX control pin. R2 feeds the residual current of Q2 to the M pin. The increase in the feed current reduces the current limit of the TOPSwitch-GX.
design feature
- High efficiency multi-output flyback power supply (minimum 77%)
- Topology solutions enable design upgrades for higher power applications
- Excellent cross adjustment rate
- Very low no-load power consumption <70 mW
- A small transformer can be used for the 132 kHz switching frequency
- Frequency jittering eliminates common mode EMI filters
- The CISPR22-B conducted EMI limit is met when the output is connected to the “fake hand†and has a >10 dB margin
DVD player power supply schematic using TOPSwitch-GX
See the PDF document for details (click on the PDF file to download)
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