DC-Transformer 257E-28-SD

Converter can be used in various applications

Key figures

  • ultrawide input voltage range: 15 ... 35 VDC
  • very high efficiency: up to 97%
  • peak input voltage: 37 VDC
  • output voltage / max. output current: 28.0 VDC / 13.0 ADC


Short-circuit proof buck-boost charging converter for primary use in supercapacitor-powered autonomous systems with an output-side backup battery. The converter with 28V output and up to 13A short-circuit current is designed to power to 13.8V batteries in parallel. The alternative 258E-28-SD with an extended input voltage range of 16 ... 55V for 48V supercapacitor powered systems complements the input voltage range generously.e


  • non-isolated step up and step down converter
  • very low input ripple and noise
  • continous no load and short circuit proof
  • for ambient temperatures of -40°C up to +85°C
  • thermal shutdown at +90°C
  • for active loads, can be connected in parallel
  • integrated EMI input and output filter
  • no derating of power
  • heatsinking metal case
  • robust design
  • unipolar output voltage
  • non-isolated output