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LM25007 Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części LM25007
Szczegółowy opis  42V, 0.5A Step-Down Switching Regulator
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM25007 Arkusz danych(HTML) 1 Page - Texas Instruments

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background image
FB
VIN
SW
RTN
BST
L1
C2
R3
R4
C4
C3
Input
LM25007
D1
R5
8
6
5
3
4
1
2
7
SHUTDOWN
GND
RCL
VCC
C5
GND
9V ± 42V
RON/ SD
RCL
RON
VOUT
C1
LM25007
www.ti.com
SNVS401B – JANUARY 2006 – REVISED FEBRUARY 2008
LM25007 42V, 0.5A Step-Down Switching Regulator
Check for Samples: LM25007
1
FEATURES
MSOP-8 and thermally enhanced LLP
packages
2
Integrated 0.74 ohm N-Channel MOSFET
switch
TYPICAL APPLICATIONS
Guaranteed 0.5Amp output current
12VDC and 24VDC distributed rail systems
Ultra-Fast Transient Response
24VAC systems
Up to 800kHz operation
Automotive body electronics and telematics
No control loop compensation required
Industrial systems
Vin feed forward provides constant operating
HB-LED constant current source
frequency
Package:
2% accurate 2.5V feedback from -40°C to
125°C
MSOP - 8
Highly efficient operation
LLP - 8 (4mm x 4mm)
Intelligent current limit protection
External shutdown control
Thermal shutdown
DESCRIPTION
The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement a
low cost, efficient, power supply. Capable of driving a 0.5Amp load over a 9V-42V input voltage range, this
device is easy to apply and is provided in the small MSOP-8 and the thermally enhanced LLP-8 packages. Ultra-
fast transient response is achieved through the use of a constant on-time architecture with Vin feed forward. This
feature provides an almost constant operating frequency over load and input voltage variations. The operating
frequency can be adjusted with a single resistor. This architecture is easy to use and tolerant of component
selection. An intelligent current limit is implemented in the LM25007 with forced off time that is inversely
proportional to Vout thus ensuring recovery from fault conditions. The output voltage may be set from 2.5V to
>30V. To improve efficiency in light load applications, the Vcc pin can be connected to an external voltage
source to eliminate the drop through the internal regulator. Additional features include: thermal shutdown, Vcc
under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter.
Basic Step-Down Regulator
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 © 2006–2008, 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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