The 257E-28-SD by Demke Electronic is a non-isolated DC/DC buck-boost converter for a nominal input voltage of 24 VDC. It operates across an input voltage range of 15 to 35 VDC and delivers 28 VDC at up to 13 A, equivalent to 360 W of output power. Efficiency reaches up to97% at nominal input voltage and full load.
| Input voltage Vin | 15…35 VDC |
|---|---|
| Nominal input voltage | 24 VDC |
| Peak input voltage | 37 VDC |
| Max. input current | 25 A |
| Recommended input fuse | 30 A |
| Output voltage Vout | 28 VDC |
| Output current Iout | 13 A |
| Output power Pout | 360 W |
| Efficiency | up to 97 % |
| Output configuration | Unipolar |
| Isolation | Non-isolated |
| EMI filter | Input and output |
| Switching frequency | 120 kHz |
| Max. capacitive load | Unlimited |
| Control function | SD – Shutdown |
| Shutdown voltage | -0.2…2 VDC |
| Dimensions | 90 × 90 × 26 mm |
|---|---|
| Weight | 360 g |
| Mounting | Wall mounting |
| Connection type | Blade terminals |
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