Two Elements Lead-Acid 16V…32V@2A Battery Charger from 170VAC to 270VAC Reference Design


Design files


A quasi-resonant isolated flyback is employed to charge two lead-acid battery elements, starting from high-line mains. The converter accepts two external signals (referred to secondary side) to provide the reference voltages, which set output voltage and current. The converter shows good wide-range efficiency thanks to valley-switching modulation.

  • Low cost, low EMI isolated flyback converter thanks to valley switching
  • Compact solution (small footprint: only 60mm x 60mm) supplies 64W maximum with almost flat efficiency (78%...89%) from 0.1A to 2A
  • Employs a depletion-mode startup FET to further reduce standby lossses
Output voltage options PMP30047.1
Vin (Min) (V) 170
Vin (Max) (V) 270
Vout (Nom) (V) 32
Iout (Max) (A) 2
Output Power (W) 64
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- Quasi Resonant
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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TIDUCB7.PDF (1098 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


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Technical documentation

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Type Title Date
* Test report PMP30047 Test Results Sep. 14, 2016

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