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LM5017 Datasheet(PDF) 8 Page - Texas Instruments |
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LM5017 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 31 page FB VIN VCC SW RTN BST 1.225V VILIM LM5017 RON ILIM COMPARATOR + - V UVLO ON/OFF TIMERS COT CONTROL LOGIC 1.225V START-UP REGULATOR VIN FEEDBACK DISABLE THERMAL SHUTDOWN UVLO OVER-VOLTAGE 1.62V UVLO 4.5V SD SHUTDOWN VDD REG BG REF 0.66V 20 µA CURRENT LIMIT ONE-SHOT LM5017 SNVS783I – JANUARY 2012 – REVISED OCTOBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The LM5017 step-down switching regulator features all the functions needed to implement a low cost, efficient, buck converter capable of supplying up to 0.6 A to the load. This high voltage regulator contains 100-V, N- channel buck and synchronous switches, is easy to implement, and is provided in thermally enhanced HSOP PowerPAD-8 and WSON-8 packages. The regulator operation is based on a constant on-time control scheme using an on-time inversely proportional to VIN. This control scheme does not require loop compensation. The current limit is implemented with a forced off-time inversely proportional to VOUT. This scheme ensures short circuit protection while providing minimum foldback. The LM5017 can be applied in numerous applications to efficiently regulate down higher voltages. This regulator is well suited for 48-V telecom and automotive power bus ranges. Protection features include: thermal shutdown, Undervoltage Lockout (UVLO), minimum forced off-time, and an intelligent current limit. 7.2 Functional Block Diagram 8 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: LM5017 |
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