PMP9649, Reference Design - Universal Line Input AC-DC 3W High Side Buck Converter using UCC28720. The PMP9649 reference design is a simple, low-cost high side Buck converter to convert universal AC input voltage (85Vac to 265Vac) to a non-isolated 20V/150mA DC output with UCC28720 controller. BJT is applied as the buck switch for cost optimization and simplicity is achieved with built-in sample and hold regulation function in UCC28720
