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8W DVD power supply with NCP1027

Posted: 27 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DVD player? power supply? On Semi NCP1027? application note?

DVD players require a few different voltages to power the logic circuitry but also all servo-mechanisms linked to the tray and optical head actuators. The NCP1027 lends itself very well to this kind of applications where simple architectures lead to the lowest assembly cost. Despite the variety of low-end DVD players on the market, there is a common trend on the power supply requirements:

??Universal input voltage: 85- to 265Vac, 2 wire power cord
??Five different DC voltages, 1 non-filtered bias level:

1. 5V/1A
2. 3.3V/1A
3. -12V/20mA
4. +12V/20mA
5. -23V/10mA
6. Floating display bias

??Low standby power in no-load and partial load conditions

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