The PMP9707 reference design uses Buck converter to convert universal AC input voltage (85Vac to 265Vac) to a 12V/200mA DC output with UCC28722 controller. BJT is applied to the buck switch for cost optimization, and simplicity is achieved with bulit-in sample and hold regulation function in UCC28722.
Features
- Universal AC Input Wide Vin capability (85Vac to 265Vac)
- Simple, Low cost solution with BJT employed as Buck switch
- Small 14.6mm2 two layer PCB footprint with 24 BOM components (excluding test points)
- Conducted EMI tested (confirms EN550022 and CISPR-22 Class B)