12W universal input constant voltage power adapter designed with TNY278PN, with circuit diagram, bill of materials, transformer specification file

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Summary:

Way of working

The power supply is a 12 V, 1 A output wide voltage input flyback converter using the TNY278PN device in the TinySwitch-III family. Since many functions are already integrated inside the device, only 31 in-line components (without surface soldering components) are required, which allows for a simple single-sided PCB layout.

design feature

• No-load power consumption is less than 50 mW at 265 VAC input (connected to R8)
• The efficiency of the load mode is greater than 75% (CEC standard requirements are greater than or equal to 71%)
• Different MOSFET current limit points (ILIMIT–1, ILIMIT, or ILIMIT+1) can be selected by BP/M pin capacitance values: for better design flexibility
• OVP overvoltage protection is achieved by detecting the output overvoltage through the primary bias winding
• Accurate (±5%) auto-recovery and hysteretic shutdown with hysteresis to maintain PCB temperature within safe range
• Enters the auto-restart protection state when the output short circuit and the feedback loop open loop
• Package pin creepage distance greater than 3.2 mm: Ensure reliable operation of the power supply in humid and highly polluted environments

12W universal input constant voltage power adapter PCB physical map

12W universal input constant voltage power adapter circuit diagram

12W universal input constant voltage power adapter PCB layout

12W universal input constant voltage power adapter component list

See the uploading documentation for details (click to download)