PMP5568

A Fully Featured, 350W Offline High Performance Power Supply Reference Design

PMP5568

Design files

Overview

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”)

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU186.PDF (3933 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

SLUC383.ZIP (5321 K)

Detailed schematic diagram for design layout and components

SLUR945.PDF (59 K)

Detailed schematic diagram for design layout and components

SLUR946.PDF (171 K)

Detailed schematic diagram for design layout and components

SLUR947.PDF (462 K)

Detailed schematic diagram for design layout and components

SLUR948.PDF (86 K)

Detailed schematic diagram for design layout and components

SLUR941.PDF (26 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

SLUR942.PDF (24 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

SLUR943.PDF (29 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

SLUR944.PDF (49 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

Products

Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430F225216 MHz MCU with 16KB Flash, 512B SRAM, haptics-enabled, capacitive touch, 10-bit ADC, UART/SPI/I2C

Data sheet document-pdfAcrobat PDF
PWM controllers

UCC28950Green phase-shifted full-bridge controller with Synchronous Rectification control

Data sheet document-pdfAcrobat PDF open-in-new HTML
Power factor correction (PFC) controllers

UCC28070Two-phase Interleaved continuous conduction mode (CCM) PFC controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Supervisor & reset ICs

TPS38093-pin voltage supervisor (reset IC) with active-low, push-pull reset

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
Test report PMP5568 Test Results Dec. 18, 2013

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