36W universal input dual output auxiliary power supply reference design for PSU with greater than 90% efficiency

TIDA-00709 is a 36W dual-output auxiliary power supply with universal DC input, targeting server and telecom power supplies. This reference design uses the UCC28740 constant voltage/constant current (CV-CC) flyback controller to implement a quasi-resonant (QR) flyback converter with optocoupled feedback for voltage and primary-side regulation for current ( PSR). To improve efficiency, the TIDA-00709 uses a synchronous rectifier with a synchronous controller UCC24636 and a low RDS(on) MOSFET to achieve a 12V_ISO/2.75A main output. This design is small and economical and has almost all necessary built-in protection mechanisms, such as protection against output overvoltage and short circuits. Additionally, the design features built-in electronic fuses for fault isolation on the 12V main output voltage rail without affecting any other outputs.

characteristic

• ● High average efficiency (greater than 91%) and peak efficiency greater than 92%
• ● As an auxiliary power supply, the minimum efficiency at 10% load is greater than 86.5%, which can meet the 80 Plus Titanium standard of server PSU
• ● Compact size (40mm x 45mm) enables high power density solutions
• ● With low standby power consumption (approximately 100mW), it helps meet the no-load condition restrictions of US Department of Energy Level VI and EU CoC Level 2
• ●Dual output: 12V/0.25A and 12V_ISO/2.75A