\nThe 257LE-48-SD<\/strong> by Demke Electronic is a compact, non-isolated \nThe 257LE-48-SD therefore provides an efficient interface between different battery voltages \nWith an efficiency of up to 98%<\/strong>, the 257LE-48-SD is designed for highly \nThis is particularly beneficial in battery-powered applications, where conversion losses have a \nHigh power does not necessarily require a large and heavy converter. The 257LE-48-SD delivers \nIts low weight is particularly notable considering its robust \nThe result is a high power density that is particularly valuable in applications where weight and \nThe control system of the 257LE-48-SD is designed to maintain stable output operation across the \nCombined CC\/CV control<\/strong> provides both precise voltage regulation and defined \nThis characteristic is particularly useful with dynamic, capacitive or actively controlled loads \nIn high-performance DC\/DC converters, maximum output power alone does not determine the quality \nThe 48 V rail remains controlled even during rapid changes in output current. The design follows \nWhen additional output power is required, multiple 257LE-48-SD converters can be operated in \nThis allows higher-power 48 V supplies to be built using a modular architecture with relatively \nEliminating an additional communication link reduces system complexity and removes another \nThe 257LE-48-SD features integrated filtering on both the input and output side. Low ripple and \nFor sensitive electronics, control systems, communication equipment and dynamically changing \nThe 257LE-48-SD has been developed for reliable operation under demanding conditions. Its wide \nThe combination of high efficiency, compact dimensions, low weight, robust construction The 257LE-48-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 10 to 35 VDC and delivers 48.40 VDC at up to 4.75 A, equivalent to 228 W of output power. Efficiency reaches up to98% at nominal input voltage and full load.<\/p>\n","protected":false},"featured_media":10869,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[93],"product_tag":[],"product_application":[152,158,112,111,156,114,97,148,110,95,162,150,184],"product_standard":[146,140,138,144,126,130,136,132,122,120,118,134,142],"class_list":["post-10868","product","type-product","status-publish","has-post-thumbnail","product_cat-dc-dc-buck-boost-converters","first","instock","shipping-taxable","product-type-simple"],"acf":{"vin_min":10,"vin_max":35,"vin_nom":24,"vin_peak":37,"efficiency_max":98,"vout":48.4,"iout":4.75,"pout":228,"output_configuration":"single","em_filter":"input_output","switching_frequency":116,"max_capacitive_load":"infinite","shutdown_voltage_min":-0.2,"shutdown_voltage_max":2.8,"enable_voltage_min":"","enable_voltage_max":"","switch_high_voltage_min":"","switch_high_voltage_max":"","mounting":"wall","connection_type":"Flachstecker","plug_pin_diameter":"","cable_lengths":"","produktstatus":"bto","temp_min":-40,"temp_max":85,"thermal_shutdown_temp":90,"ip_rating":"","mtbf":"","technical_features":["cc_cv","parallel","decoupling_diode","no_load_short_circuit","emi_input_output","no_derating","input_low_ripple_noise","wide_input","shutdown"],"remote_control":"sd","isolation_type":"non_isolated","potting":false,"certifications":["reach","rohs","ce"],"datasheet_de":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.020_DB.pdf","datasheet_en":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.020_DB_EN.pdf","drawing":"","safety_instructions":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.020_SI.pdf","step":"","download_base":"257.020","step_model":"size_90x90x26","pim_id":"237979000000242035","web_visible":true,"sync_status":"success","last_sync":"2026-10-06 14:28:03","successor_sku":"","alternative_skus":"","h1_de":"257LE-48-SD | DC\/DC buck-boost converter 24 VDC to 48.40 VDC, 228 W","h1_en":"257LE-48-SD | DC\/DC buck-boost converter 24 VDC to 48.40 VDC, 228 W"},"_links":{"self":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product\/10868","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media\/10869"}],"wp:attachment":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media?parent=10868"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_brand?post=10868"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_cat?post=10868"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_tag?post=10868"},{"taxonomy":"product_application","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_application?post=10868"},{"taxonomy":"product_standard","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_standard?post=10868"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nDC\/DC converter designed to supply 48 V systems from 12 V and 24 V power sources<\/strong>.
\nWith a nominal input voltage of 24 VDC, it operates across a wide input voltage range of
\n10 to 35 VDC<\/strong> and provides a regulated output voltage of
\n48.40 VDC<\/strong> at up to 4.75 A<\/strong>. The specified output power is 228 W.\n<\/p>\n
\nand modern 48 V power architectures. Its wide input voltage range also allows reliable operation
\nwhen the supply voltage varies significantly, as is common in battery-powered and mobile systems.\n<\/p>\nUp to 98% efficiency<\/h3>\n
\nefficient power conversion with very low losses. High conversion efficiency reduces heat
\ngeneration and ensures that as much of the available input energy as possible reaches the
\n48 V load.\n<\/p>\n
\ndirect impact on overall system efficiency. Lower power dissipation also reduces the thermal load
\non the converter and simplifies integration into compact systems with limited installation space.\n<\/p>\n228 W at only approximately 360 g<\/h3>\n
\nup to 228 W of output power while measuring only 90 \u00d7 90 \u00d7 26 mm<\/strong> and weighing
\napproximately 360 g<\/strong>.\n<\/p>\n
\nfully potted polyurethane construction<\/strong>. The potting compound protects the power
\nelectronics against demanding environmental conditions and mechanical stress while also supporting
\nefficient heat transfer from the internal components to the housing.\n<\/p>\n
\ninstallation space are critical without compromising robustness or available output power.\n<\/p>\nStable 48 V output under changing operating conditions<\/h3>\n
\nspecified input voltage range. Variations in battery voltage and connected load are regulated to
\nprovide a reliable 48 V supply for downstream equipment.\n<\/p>\n
\ncurrent limiting. Under normal operating conditions, the converter operates in constant-voltage
\nmode. When the current limit is reached, it transitions in a controlled manner into
\nconstant-current operation.\n<\/p>\n
\nand ensures predictable converter behavior even under demanding load conditions.\n<\/p>\nDesigned for dynamic loads<\/h3>\n
\nof the power supply. The response to rapid changes in load is equally important. The control
\nsystem of the 257LE-48-SD has therefore been specifically designed for stable operation under
\ndynamic conditions.\n<\/p>\n
\nour Reliability by Design<\/strong> philosophy, balancing control dynamics, thermal stress
\nand semiconductor protection to achieve not only high performance but also reliable long-term
\noperation.\n<\/p>\nEasy scalability through parallel operation<\/h3>\n
\nparallel. Load sharing is achieved through a defined passive droop characteristic<\/strong>,
\neliminating the need for an additional load-share bus or communication link between the individual
\nDC\/DC converters.\n<\/p>\n
\nlittle additional integration effort. The same principle can also be used for redundant power
\narchitectures in which multiple converters supply a common 48 V rail.\n<\/p>\n
\npotential point of failure from the power architecture.\n<\/p>\nClean power through integrated filtering<\/h3>\n
\nlow electrical noise support a clean supply for downstream electronics and simplify EMC-compatible
\nintegration of the converter into the overall system.\n<\/p>\n
\nloads, a low-noise power supply can help reduce the need for additional filtering and minimize
\nelectrical stress on downstream components.\n<\/p>\nRobust design for mobile and industrial systems<\/h3>\n
\ntemperature range, fully potted construction, integrated filtering and permanent short-circuit
\nand no-load capability support use in mobile, battery-powered and industrial systems.\n<\/p>\n
\nand scalable output power<\/strong> makes the 257LE-48-SD an efficient solution for modern
\n48 V power architectures.<\/p>\n","protected":false},"excerpt":{"rendered":"