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LM25017 데이터시트(PDF) 8 Page - Texas Instruments

부품명 LM25017
상세설명  LM25017 48-V, 650-mA Constant On-Time Synchronous Buck Regulator
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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LM25017 데이터시트(HTML) 8 Page - Texas Instruments

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background image
FB
VIN
VCC
SW
RTN
BST
1.225V
VILIM
LM25017
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
LM25017
SNVS951D – DECEMBER 2012 – REVISED DECEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM25017 step-down switching regulator features all the functions needed to implement a low cost, efficient,
buck converter capable of supplying up to 650 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 fold-back.
The LM25017 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 (UVLO), minimum forced off-time, and an intelligent current limit.
7.2 Functional Block Diagram
8
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Product Folder Links: LM25017


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