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UCC28781EVM-053

UCC28781-Q1 evaluation module for automotive 500-Vdc input ZVS-flyback power supply applications

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UCC28781EVM-053

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Overview

UCC28781EMV-053 demonstrates high-efficiency, high-density, high-voltage automotive bias supply with 60-W , 15-V ouput using a zero-voltage-switching flyback (ZVSF) controller. The UCC28781-Q1 drives a primary-side silicon MOSFET directly and drives a secondary-side synchronous rectifier through a UCC5304 isolated gate-driver to increase efficiency and to achieve ZVS.

Features
  • High frequency operation >150 kHz enables small solution size while multi-mode operation maintains high efficiency across line and load.
  • Fixed 15-V output is rated for 4 Adc when the input is between 500 Vdc and 250Vdc, and is derated to 2 A for inputs between 250 Vdc and 50 Vdc.
  • Efficiency > 94% at 250 Vdc, full load and stand-by power < 70 mW at 500 Vdc, no load.
  • Also included on-board is an optional means to power the EVM from a 90-Vac to 264-Vac source.
  • This circuit design is tested and is available as an EVM with a corresponding user's guide.
AC/DC & DC/DC controllers (external FET)
UCC28781 — High-density, zero-voltage switching (ZVS) flyback controller with integrated SR control UCC28781-Q1 — Automotive, high-density, zero-voltage switching (ZVS) flyback controller with integrated SR control

 

Isolated gate drivers
UCC5304 — 5kVrms, 4A/6A single-channel isolated gate driver with 5V UVLO for GaNFETs & MOSFETs

 

Shunt voltage references
ATL431 — 2.5-V low-IQ adjustable precision shunt regulator
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Evaluation board

UCC28781EVM-053 — UCC28781-Q1 evaluation module for automotive 500-Vdc input ZVS-flyback power supply applications

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Technical documentation

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Type Title Date
User guide Using the UCC28781EVM-053 Zero-Voltage-Switching Flyback Converter (Rev. A) PDF | HTML 15 Sep 2022
Certificate UCC28781EVM-053 EU RoHS Declaration of Conformity (DoC) 19 Aug 2021
Data sheet UCC28781-Q1 Zero-Voltage-Switching Flyback Controller with Dedicated Synchronous Rectifier Gate-Drive datasheet PDF | HTML 24 Feb 2021

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