{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC2845D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC2845D","canonicalUrl":"https://icboms.com/texas-instruments/UC2845D","factsUrl":"https://icboms.com/api/mcp/products/UC2845D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC2845D current-mode PWM controller, 14-SOIC, supports boost, buck, flyback, and forward topologies, 48% max duty cycle, switching up to 500kHz, -40°C to 85°C operating range.","salesMarkdown":"The Texas Instruments UC2845D is a current-mode PWM controller designed for a range of isolated and non-isolated DC-DC converter topologies: boost, buck, flyback, and forward. It drives a single transistor stage and includes frequency control for setting the oscillator up to 500 kHz. The 48% maximum duty cycle is a hard limit for flyback and forward converters where transformer reset timing is critical — push past it and you risk core saturation on the next cycle. The controller operates from a 12 V to 28 V supply rail, typical for industrial power bricks and auxiliary supplies in motor drives or telecom equipment. ## Package and mounting The 48% duty cycle ceiling is the first thing to check when the MOSFET or transformer runs hot. The controller will not let the duty cycle exceed 48% per cycle, which forces the transformer to reset fully before the next on-time.","metaTitle":"UC2845D PWM Controller, 48% Duty Cycle, 500kHz, 14-SOIC","metaDescription":"UC2845D current-mode PWM controller from Texas Instruments. Boost/buck/flyback/forward topologies, 48% max duty cycle, up to 500kHz, -40 to 85°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Function":"Step-Up, Step-Down, Step-Up/Step-Down","Topology":"Boost, Buck, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"-40°C ~ 85°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.56","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.56000","currency":"USD"},{"qty":10,"price":"$1.40400","currency":"USD"},{"qty":25,"price":"$1.32480","currency":"USD"},{"qty":100,"price":"$1.12890","currency":"USD"},{"qty":250,"price":"$1.06000","currency":"USD"},{"qty":500,"price":"$0.92750","currency":"USD"},{"qty":1000,"price":"$0.76850","currency":"USD"},{"qty":2500,"price":"$0.75000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum duty cycle of UC2845D?","answer":"The maximum duty cycle is 48%. This is a hard limit enforced cycle-by-cycle, critical for transformer reset in flyback and forward converters."},{"question":"What is the UC2845D used for?","answer":"The UC2845D is used as a PWM controller in DC-DC converters — boost, buck, flyback, and forward topologies. Typical applications include industrial power supplies, auxiliary bias supplies in motor drives, telecom rectifiers, and battery chargers where isolated or non-isolated regulation is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC2845D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC2845D when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}