Condensing boiler power circuit design

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Summary:

The power supply shown in the figure is an isolated flyback power supply using a TOP258PN device. This design is highly efficient and can operate in high temperature (65 °C) environments without the need for any external heat sink components.

design feature

• High efficiency under a variety of load conditions
• Works at high ambient temperatures (65 °C)
• P package with creepage distance/space distance greater than 3.2 mm, high humidity and pollution
• Ensure reliable operation of the power supply
• Integrated safety and reliability:
• Output overvoltage protection can be configured for latching or auto-recovery
• Precise, auto-recovery and hysteretic shutdown with hysteresis
• Temperature is maintained within a safe range under all conditions
• Enters the auto-restart protection state when the output short circuit and the feedback loop open loop
• Conducted EMI limits in accordance with EN55022 and CISPR-22 Class B

See the PDF document for details (click on the PDF file to download)