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Texas Instruments UCC28720 | Demoboard PMP9059
120VAC Input 5V/200mA Flyback Converter With BJT Switch Reference Design
Overview
| Topology | Flyback Converter |
| Input voltage | 90-132 V |
| Output 1 | 3.3 V / 0.05 A |
| Output 2 | 5 V / 0.15 A |
| IC revision | B |
Description
This reference design creates a 5V at 200mA from a 120VAC Input. This supply is to designed to fit into a very small volume with approximately 10mm total height. The UCC28720 primary side controller with a BJT power switch provides a low cost design. A TPS71433 is also used to provide an additional 3.3V rail. It is important to note the outputs are only functionally (not for safety) isolated from the input.
