PMP9649 Reference Design

Texas Instruments

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 bulit-in sample and hold regulation function in UCC28720.

  • Universal AC Input (85Vac to 265Vac)Simple: low cost solution with BJT employed as buck switchSmall 14.6mm2 two layer PCB footprint with 24 BOM components (excluding test points)Greater than 77% full-load efficiency at high lineConducted EMI tested (confirms EN550022 and CISPR-22 Class B)
Product Categories
  • Power management


Part Number Name Companion Part
UCC28720 UCC28720 Buy Datasheet

Bill Of Materials

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Design File

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Test Data

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Other Documents

Title Updated Type Size (KB)
PMP9649 Gerber 10 Dec 2014 ZIP 188
PMP9649 BOM 10 Dec 2014 PDF 108
PMP9649 Schematic 10 Dec 2014 PDF 80