This reference design showcases a robust, compact, and efficient main power supply in DCM flyback topology for motor drives using the UCC28740 flyback controller. This design can work with a wide input voltage range of 290–1000 VDC delivering up to 50 W of continuous power. Multiple output rails at 24 V (1.25 A), 15 V (0.67 A), 5 V (2 A), 3.3 V (0.1 A) are available for control, gate drive, sensor, I/O, and other applications; additionally an isolated 5-V (0.1 A) output is provided for isolated communication power. The load and line regulation are within 0.5% over the entire operation range by the use of opto-regulated feedback. Key benefits of the UCC28740 device include valley switching enabling higher efficiency (>85% at 550 VDC, 50 W), internal HV FET enabling self-start without external circuitry, and frequency dithering that reduces EMI.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
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Complete listing of design components, reference designators, and manufacturers/part numbers
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Files used for 3D models or 2D drawings of IC components
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | 50-W Opto-Regulated Multi-Output Flyback Converter Ref. Des. for 380–480 VAC Mot (Rev. A) | Sep. 18, 2018 |
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