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LM34925 데이터시트(PDF) 8 Page - Texas Instruments |
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LM34925 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 27 page FB VIN VCC SW RTN BST 1.225V VILIM LM34925 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 LM34925 SNVS846F – JUNE 2012 – REVISED NOVEMBER 2014 www.ti.com 7 Detailed Description 7.1 Overview The LM34925 step-down switching regulator features all the functions needed to implement a low cost, efficient, isolated bias supply. This high-voltage regulator contains 100-V, N-channel buck, and synchronous switches, is easy to implement, and is provided in thermally enhanced SO 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. Current limit is implemented with forced off-time inversely proportional to VOUT. This scheme ensures short circuit protection while providing minimum foldback. The simplified block diagram of the LM34925 device is shown in the Functional Block Diagram section. The LM34925 device 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, minimum forced off-time, and an intelligent current limit. 7.2 Functional Block Diagram 8 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LM34925 |
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