Reference Designs
Universal AC Input 5V/2A USB Adaptor with PSR Reference Design
Texas Instruments
This reference design provides an isolated 5V/2A output from a universal 85-265VAC input. This design uses the UCC28710 PWM controller with primary-side regulation (PSR), eliminating the need for an optocoupler and saving cost. The average efficiency is over 80%. The UCC28710 also provides accurate current limiting which eliminates the need for a load protecting switch on the output.
Features
- High efficiency: over 80% average
- Low standby power: less than 20mW
- No optocoupler
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