Ultra-wide Input Range (48VAC to 240VAC) Flyback Reference Design
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Key Document


The PMP30280 reference design generates two isolated outputs (6V @ 1.2A / 20V @ 0.15A) from an AC input (48VAC to 240VAC). The LM5021 operates at either a fixed switching frequency or in a skip cycle mode when the converter load is light. The design uses an optical coupler to regulate the output and to improve transient response.

  • Isolated outputs
  • Wide input range
  • Optocoupler feedback provides accurate regulation
  • Test report available

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)4848
Vin (Max) (V)240240
Vout (Nom) (V)620
Iout (Max) (A)1.2.15
Output Power (W)7.23
Input TypeACAC
TopologyFlyback- CCMFlyback- CCM

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ATL431  2.5-V low-IQ adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LM5021  30V, 1MHZ current mode PWM controller  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ATL431 Download Download
LM5021 Download Download
Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1139 11 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 100 11 Dec 2017
ZIP 1103 11 Dec 2017
PDF 146 11 Dec 2017
PDF 131 11 Dec 2017
PDF 36 11 Dec 2017
PDF 150 11 Dec 2017

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