Short-circuit proof buck-boost charging converter for primary use in supercapacitor-powered autonomous systems with an output-side backup battery. The converter with 28V output and up to 13A short-circuit current is designed to power to 13.8V batteries in parallel. The alternative 258E-28-SD with an extended input voltage range of 16 … 55V for 48V supercapacitor powered systems complements the input voltage range generously.<\/p>\n","protected":false},"excerpt":{"rendered":"
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.<\/p>\n","protected":false},"featured_media":8227,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[93],"product_tag":[],"product_application":[112,111,97,110,95],"product_standard":[146,140,138,144,126,130,136,132,122,120,118,134,142],"class_list":["post-8218","product","type-product","status-publish","has-post-thumbnail","product_cat-dc-dc-auf-abwaertswandler","first","instock","shipping-taxable","product-type-simple"],"acf":{"vin_min":15,"vin_max":35,"vin_nom":24,"vin_peak":37,"efficiency_max":97,"vout":28,"iout":13,"pout":360,"output_configuration":"single","em_filter":"input_output","switching_frequency":120,"max_capacitive_load":"infinite","shutdown_voltage_min":-0.2,"shutdown_voltage_max":2,"enable_voltage_min":0,"enable_voltage_max":0,"switch_high_voltage_min":0,"switch_high_voltage_max":0,"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"],"remote_control":false,"isolation_type":"non_isolated","potting":false,"certifications":["reach","rohs","ce"],"datasheet_de":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.001_DB.pdf","datasheet_en":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.001_DB_EN.pdf","drawing":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.001_TZ.pdf","safety_instructions":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.001_SI.pdf","step":"","download_base":"257.001","step_model":"size_90x90x26","pim_id":"237979000000156739","web_visible":true,"sync_status":"success","last_sync":"2026-09-01 08:42:26","successor_sku":"","alternative_skus":"","h1_de":"257E-28-SD | DC\/DC buck-boost converter 24 VDC to 28 VDC, 360 W","h1_en":"257E-28-SD | DC\/DC buck-boost converter 24 VDC to 28 VDC, 360 W"},"_links":{"self":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product\/8218","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\/8227"}],"wp:attachment":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media?parent=8218"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_brand?post=8218"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_cat?post=8218"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_tag?post=8218"},{"taxonomy":"product_application","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_application?post=8218"},{"taxonomy":"product_standard","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_standard?post=8218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}