A Fully Featured, 350W Offline High Performance Power Supply Reference Design PMP5568 (ACTIVE)

Description & Features

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Description

This project is a complete 350W, high performance, high speed offline power supply solution. It contains a novel, microcontroller-driven synchronous bridge rectifier, a 2-phase interleaved PFC stage and a phase-shifted fullbridge as down converter. It has an universal input (85 .. 265V AC) and the output voltage is adjustable between 12 and 14V. The continuous output current is 25A, the peak current is 27A. A second microcontroller monitors several values (input voltage, PFC voltage, output voltage, output current, temperatures), is the interface to the user (LCD, push-buttons), adjusts the output voltage and synchronizes the switching frequency of all converters.

Features
  • Fanless & ultraslim, heigth 45mm
  • Efficiency +93% at high line (plug-to-plug)
  • 2-Phase interleaved PFC with UCC28070:
    • Continuous conduction mode for low noise operation (PFC scalable to bigger power levels)
    • MSP430 controlled PFC bridge rectifier (Value Line MSP430F2012)
  • Synchronous Phase Shifted Fullbridge with UCC28950:
    • Controller on secondary side to avoid low pass behavior of optocoupler
    • Results in high loop bandwidth of +30 kHz, therefore smaller output capacitance possible
  • Total System Monitoring & Control by MSP430F2252:
    • AC input voltage & intermediate PFC voltage via isolated I2C-interface
    • Output voltage & current
    • Temperature of left/right heat sink and case temperature
    • Output voltage is adjustable between 12 and 14V with a resolution of 100mV
    • All controllers are synchronized by µC; switching frequency could be adjusted for “out of RF band operation”
  • µC is able to vary the switching frequency, too (“Dithering”)

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Schematic/Block Diagram

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Test Data

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430F2252  16-bit Ultra-Low-Power Microcontroller, 16KB Flash, 512B RAM  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS3809  3-pin voltage supervisor (reset IC) with active-low, push-pull reset  Power management  Sample & Buy Not Available
UCC28070  Two-Phase Interleaved CCM PFC Controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
UCC28950  Green Phase-Shifted Full-Bridge Controller with Synchronous Rectification  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)
MSP430F2252 Download -
Download Download
Download -
TPS3809 Download Download
UCC28070 Download Download
Download Download
UCC28950 Download -

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 4049 18 Dec 2013
Design files (8)
Title Type Size (KB) Date
PDF 86 25 Sep 2012
PDF 462 25 Sep 2012
PDF 171 25 Sep 2012
PDF 59 25 Sep 2012
PDF 49 25 Sep 2012
PDF 29 25 Sep 2012
PDF 24 25 Sep 2012
PDF 26 25 Sep 2012
Related Tools & Software

Software (1)



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