DC/DC-Converters
257LE-24-SD – DC/DC buck-boost converter 24 VDC to 24 VDC by Demke Electronic

257LE-24-SD | DC/DC buck-boost converter 24 VDC to 24 VDC, 300 W

DC-Converter 257LE-24-SD

SKU: 257.003
MTS – standard product / make to stock
Lifecycle: MTS – Available short-term

The 257LE-24-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 9.50 to 35 VDC and delivers 24 VDC at up to 12.50 A, equivalent to 300 W of output power. Efficiency reaches up to98% at nominal input voltage and full load.

CC/CViConstant-current/constant-voltage control, e.g. for charging applications.Parallel operation / active loadsInput and output EMI filterNo power deratingNo-load and short-circuit proof
Input voltage Vin9.5…35 VDC
Output voltage Vout24 VDC
Output current Iout12.5 A
Output power Pout300 W
Efficiencyup to 98 %
Technical Documentation
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Product Description: DC-Converter 257LE-24-SD

This non-isolated DC/DC buck-boost converter is widely used as the DC-Converter 257LE and its 24V output at 12.5A typical short circuit current is used for stabilization of a 24V onboard power grid. The L-Version as 257LE-24-SD is designed to start up at about 9.5VDC and to step up the input voltage between 8V and 35V uncompromising to 24VDC. Its undervoltage lockout is 8VDC typical! Hence, supercapacitor powered electrical systems can be discharged to very low values or 12V battery systems can be regulated to 24V appropriately. Customer specific modifications as follows can be realized: 12V output, 13.8V output, 27V output, 36V output up to 55V output.

Technical Data: DC-Converter 257LE-24-SD

Electrical Specifications

Input voltage Vin9.5…35 VDC
Nominal input voltage24 VDC
Peak input voltage37 VDC
Max. input current35 A
Recommended input fuse50 A
Output voltage Vout24 VDC
Output current Iout12.5 A
Output power Pout300 W
Efficiencyup to 98 %
Output configurationUnipolar
IsolationNon-isolated
Insulation strength primary to case1500 VDC
EMI filterInput and output
Switching frequency120 kHz
Max. capacitive loadUnlimited
Control functionSD – Shutdown
Shutdown voltage-0.2…2.8 VDC

Mechanical Specifications

Dimensions90 × 90 × 26 mm
Weight355 g
MountingWall mounting
Connection typeBlade terminals

Standards and Certifications

CEEN 55022 < Class AEN 61000-4-2EN 61000-4-3EN 61000-4-4EN 61000-4-5EN 61000-4-6EN 61000-6-2EN 61000-6-4IEC 60068-2-6:2007IEC 60068-2-27:2009REACHRoHS

Product Features

robust and climate-resistant designexcellent thermal characteristicsfull PU potting for demanding environmental conditionscontinuous no-load and short-circuit proofintegrated EMI input and output filterno power deratingCC/CV charging characteristiciConstant-current/constant-voltage control, e.g. for charging applications.for active loads, can be connected in parallelinternal decoupling diode against reverse currentvery low input ripple and noisewide input voltage rangefor ambient temperatures from -40 °C to +85 °Cthermal shutdown at +90 °C

Applications

Battery-Powered SystemsBattery Chargers & Charging SystemsCable Cars & Mountain RailwaysE-MobilityIndustrial & Custom ApplicationsIntralogistics & Warehouse AutomationMaterial Handling VehiclesRail Transportation

Downloads and Documentation

DatasheetTechnical datasheetSafety instructionsTechnical drawingCharacteristic curves
We convert power for first-class projects

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