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LM34925 Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza LM34925
Descripción Electrónicos  Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
Download  26 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM34925 Datasheet(HTML) 1 Page - Texas Instruments

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VIN
BST
RON
RTN
SW
VCC
FB
UVLO
VIN
VOUT1
VOUT2
RFB1
RUV1
RON
COUT1
CBST
D1
CIN
COUT2
RFB2
RUV2
X1
Rr
NP
NS
LM34925
CVCC
+
D2
7.5V-100V
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LM34925
www.ti.com
SNVS846E – JUNE 2012 – REVISED DECEMBER 2013
Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
Check for Samples: LM34925
1
FEATURES
APPLICATIONS
2
Wide 7.5 V to 100 V Input Range
Isolated Telecom Bias Supply
Integrated 100 V, High and Low Side Switches
Isolated Automotive and Industrial Electronics
No Schottky Required
DESCRIPTION
Constant On-Time Control
The LM34925 regulator features all of the functions
No Loop Compensation Required
needed to implement a low cost, efficient, isolated
Ultra-Fast Transient Response
bias regulator. This high voltage regulator contains
two 100V N-Channel MOSFET switches - a high-side
Nearly Constant Operating Frequency
buck switch and a low-side synchronous switch. The
Intelligent Peak Current Limit
Constant-on-time (COT) control scheme employed in
Adjustable Output Voltage From 1.225 V
the LM34925 requires no loop compensation and
provides excellent transient response. The regulator
Precision 2% Feedback Reference
operates with an on-time that is inversely proportional
Frequency Adjustable to 1 MHz
to the input voltage. This feature allows the operating
Adjustable Undervoltage Lockout (UVLO)
frequency to remain relatively constant. An intelligent
Remote Shutdown
peak current limit is implemented with integrated
sense circuit. Other features include a programmable
Thermal Shutdown
input under voltage comparator to inhibit operation
Packages:
during low-voltage conditions. Protection features
8-Pin WSON
include thermal shutdown and VCC Undervoltage
Lockout (UVLO). The LM34925 is offered in 8-pin
8-Pin SO PowerPAD
WSON and 8-pin SO PowerPAD plastic packages.
Typical Application
Figure 1. Typical Application Schematic
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2012–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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