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LM25019SDX bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM25019SDX bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 28 page FB VIN VCC SW RTN BST 1.225V VILIM LM25019 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 LM25019 www.ti.com SNVS952E – DECEMBER 2012 – REVISED NOVEMBER 2015 7 Detailed Description 7.1 Overview The LM25019 step-down switching regulator features all the functions needed to implement a low-cost, efficient, buck converter that can supply up to 100 mA to the load. This high-voltage regulator contains 48 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. 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 simplified block diagram of the LM25019 device is shown in Figure 10. The LM25019 device can be applied in numerous applications to efficiently regulate down higher voltages. This regulator is well suited for 12-V and 24-V rails. Protection features include: thermal shutdown, undervoltage lockout, minimum forced off-time, and an intelligent current limit. 7.2 Functional Block Diagram Figure 10. Functional Block Diagram Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM25019 |
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