DC-Transformer 257LEX-12-SD

Converter can be used in various applications

Key figures

  • ultrawide input voltage range: 7 ... 35 VDC
  • very high efficiency: up to 97%
  • peak input voltage: 37 VDC
  • output voltage / max. output current: 12.0 VDC / 20.0 ADC

Applications

Short-circuit proof DC/DC step-up converter with 12V output voltage. The Demke DC-Transformer 257LEX with 12V output and up to 20A short-circuit current is designed to stabilise 12V grids. The LEX version works without compromise at very low input voltages from about 7VDC, hence supercapacitor powered systems can be discharged to a very low point and 12V battery applications, including their voltage drops down to 5 VDC to be kept alive easily. Customer-specific DC-DC converters with a wide range of output configurations are possible.

Features

  • non-isolated DC/DC buck-boost converter
  • robust and climate proof design
  • excellent thermal characteristics
  • permanently no-load and short-circuit proof
  • integrated EMI input and output filter
  • no power derating
  • for ambient temperatures between -40°C / +85°C
  • thermal shutdown at +90°C
  • CC/CV charging characteristic

Product Family

DC-Transformer Input Output Power
251-24-SD 12 ... 36 VDC 24.0 VDC / 11.0 ADC 260 W
251E-28-SD 16 ... 36 VDC 28.0 VDC / 11.0 ADC 300 W
251L-24-SD 10 ... 36 VDC 24.0 VDC / 10.0 ADC 240 W
257E-24-SD 15 ... 35 VDC 24.0 VDC / 15.0 ADC 360 W
257E-28-SD 15 ... 35 VDC 28.0 VDC / 13.0 ADC 360 W
0 W
257LE-24-SD 10 ... 35 VDC 24.0 VDC / 12.5 ADC 300 W
257LE1-29 6 ... 28 VDC 29.0 VDC / 6.5 ADC 180 W
257LEX-12-SD 7 ... 35 VDC 12.0 VDC / 20.0 ADC 240 W
257LEX-24-SD 7 ... 35 VDC 24.0 VDC / 8.0 ADC 200 W
258E-24 15 ... 58 VDC 24.0 VDC / 13.0 ADC 300 W
258E-50 20 ... 63 VDC 50.4 VDC / 10.0 ADC 500 W
258E1-27.5-On 15 ... 58 VDC 27.5 VDC / 8.0 ADC 220 W