DC-Transformer 257LEX-12-SD
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
Take away
Product Family
| DC-Transformer | Input | Output | Power |
|---|---|---|---|
| 256E-24-SD | 15 ... 70 VDC | 24.0 VDC / 6.3 ADC | 150 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 |
| 257E1-24-SD | 15 ... 35 VDC | 24.0 VDC / 15.0 ADC | 360 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 |