AC to isolated DC EVM with UCC28056B, UCC256404 and UCC24624


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PFCLLCSREVM034 is a 168-W AC/DC supply with a transition-mode power-factor-correction front end and isolated half-bridge LLC resonant converter with synchronous rectification. This EVM accepts AC input from 90 Vrms to 264 Vrms and outputs 12-V DC with 168-W full-load output power.

  • Low cost single layer PCB
  • High efficiency meeting CoC Tier II
  • Excellent no load to full load transient response
  • X capacitor discharge function
LLC controllers
UCC256404 LLC resonant controller with ultra-low power, ultra-quiet standby operation and high voltage startup


N-channel MOSFETs
CSD18535KTT 60-V, N channel NexFET™ power MOSFET, single D2PAK, 2 mOhm


Power factor correction (PFC) controllers
UCC28056 6-pin high-performance CrM & DCM PFC controller


SR & load share controllers
UCC24624 High-frequency, dual synchronous rectifier controller for LLC converters


Shunt voltage references
TLVH431A 1% low-voltage wide-operating current adjustable precision shunt regulator

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Evaluation board

PFCLLCSREVM034 – AC to isolated DC EVM with UCC28056B, UCC256404 and UCC24624

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Technical documentation

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Type Title Date
* User guide PFCLLCSREVM-034 User Guide Jul. 26, 2019
Data sheet UCC25640x LLC Resonant Controller with Ultra-Low Audible Noise and Standby Power datasheet (Rev. E) Feb. 19, 2021
Certificate PFCLLCSREVM034 EU Declaration of Conformity (DoC) May 18, 2020

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