24V/1.45A AC/DC Flyback PSU Optimized for Low AC Line Input Reference Design
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This design is a compact, low AC line input (Maximum 130Vac) Flyback converter which provides a regulated and fully-isolated 24V@1.45A output. Featuring TI's LM5021 current mode controller working at 135kHz, the converter features fast start-up and delivers greater than 85% efficiency from 30-100% load. The overall solution is very compact at 2312sq.mm. footprint area.

  • Delivers 35W output power at efficiency of 85.3% @ 85VAC, 86.6% @ 130VAC
  • 24V output compatible with standard industrial applications, less than 0.5% line/load regulation from no-load to full-load
  • 4kV galvanic isolation between input and output
  • 108mVpp ripple on output at 35W full-load condition
  • Passes conducted EMI emissions in compliance with EN55022
  • Ideal for Bias power supplies needed in industrial electronic equipment for building infrastructure, home automation etc.

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Design Files

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(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)130
Vout (Nom) (V)24
Iout (Max) (A)1.45
Output Power (W)34.8
Input TypeAC
TopologyFlyback- DCM

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5021  30V, 1MHZ current mode PWM controller  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available
OPA170  36V, microPower, Rail-to-Rail Output, General Purpose Op Amp in MicroPackages  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TLV431  1.5% accuracy, low-voltage, adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5021 Download Download
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OPA170 Download Download
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TLV431 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 435 30 Oct 2014
Design files (3)
Title Type Size (KB) Date
ZIP 73 30 Oct 2014
PDF 25 30 Oct 2014
PDF 104 30 Oct 2014

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