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LM34925 데이터시트(PDF) 8 Page - Texas Instruments

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부품명 LM34925
상세설명  Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM34925 데이터시트(HTML) 8 Page - Texas Instruments

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background image
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
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Product Folder Links: LM34925


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