Reference Design - Universal Line Input AC-DC 3W High Side Buck Converter using UCC28720 PMP9649 (ACTIVE)

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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 switch
  • Small 14.6mm2 two layer PCB footprint with 24 BOM components (excluding test points)
  • Greater than 77% full-load efficiency at high line
  • Conducted EMI tested (confirms EN550022 and CISPR-22 Class B)

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)20
Iout (Max) (A).15
Output Power (W)3
Input TypeAC
TopologyBuck- Non Sync

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28720  Constant-Voltage, Constant-Current Controller with Primary-Side Regulation for Bipolar Power Devices  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
UCC28720 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1158 10 Dec 2014
Design files (3)
Title Type Size (KB) Date
ZIP 188 10 Dec 2014
PDF 108 10 Dec 2014
PDF 80 10 Dec 2014

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