Summary:
working principle
The isolated flyback converter shown in the figure is based on the TOP258PN (U1) in the TOPSwi tch-HX IC family. Selecting a P-package (8-pin DIP package) eliminates the need for external heat sinks to reduce cost. Typical applications include LCD display power supplies, which typically require lower standby and no-load power consumption.
design feature
- high efficiency
- Full load efficiency >82% (according to CEC/Energy Star 2008 requirements for 82% load efficiency)
- Output power is 35 W, no external heat sink is required when operating in 50°
- No load and standby low power
- Standby output power is 0.55 W at input power <1 W
- No-load power consumption <160 mW at 230 V AC input
- Integrated safety and reliability:
- Accurate, auto-recovery and hysteretic shutdown with hysteresis shuts down IC temperature over a wide range of conditions
- Enters the auto-restart protection state when the output short circuit and the feedback loop open loop
- Output overvoltage protection can be configured for latching or auto-recovery
- Conforms to EN55022 and CISPR-22 Class B for conducted EMI requirements with EMI margin >10 dBμV
See the PDF document for details (click on the PDF file to download)
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