UCC28780 active clamp flyback 45W AC/DC EVM with GaN FET


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The UCC28780EVM-002 demonstrates high-efficiency and high-density for a 45-W off-line adapter using the UCC28780 active-clamp flyback controller at high frequency nominal 300 kHz using GaN MOSFET Power ICs, NV6115 and NV6117.  The EVM also uses the UCC24612 synchronous rectifier controller on the secondary side.  The output is regulated to 20 Vdc over an input voltage range of 90 Vac to 264 Vac.  The UCC28780 controller operates in several adaptive modes to minimize power loss over the full line and load ranges.

  • 45-W, 20-V AC-to-DC converter using active-clamp flyback controller, GaN MOSFET Power IC, and synchronous rectification
  • High Efficiency (> 94%), High Power Density (> 20W/in3), Low Standby Power (55mW), and High Switching Frequency (300kHz)
  • Exceeds EU Code of Conduct and US Department of Energy efficiency requirements
  • Adaptive Burst Mode feature maintains high efficiency even at light loads
  • This evaluation module is tested and orderable and includes a User's Guide

  • High-Voltage EVM User Safety Guidelines (SLVT174)

Flyback controllers
UCC28780 1-MHz High Frequency Active Clamp Flyback Controller


SR & load share controllers
UCC24612 High-frequency multi-mode synchronous rectifier controller


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

UCC28780EVM-002 — UCC28780 active clamp flyback 45W AC/DC EVM with GaN FET

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Technical documentation

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Type Title Date
* EVM User's guide Using the UCC28780EVM-002 (Rev. A) 07 Feb 2018
Certificate UCC28780EVM-002 EU Declaration of Conformity (DoC) 02 Jan 2019
Technical article Intelligently control an active clamp flyback PDF | HTML 01 Mar 2018
Data sheet UCC28780 High Frequency Active Clamp Flyback Controller datasheet (Rev. A) PDF | HTML 22 Feb 2018

Related design resources

Hardware development

UCC24612-1EVM Secondary-side synchronous rectifier controller diode-replacement demonstration board

Reference designs

PMP40328 High Efficiency, High Power Density Active Clamp Flyback Adapter with SJ FET Reference Design

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