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LM5009_14

更新时间： 2024-11-24 02:58:51
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德州仪器 - TI /
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150-mA 100-V Step-Down Switching Regulator

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LM5009  
www.ti.com  
SNVS402G –FEBRUARY 2006–REVISED FEBRUARY 2013  
150-mA 100-V Step-Down Switching Regulator  
Check for Samples: LM5009  
1
FEATURES  
DESCRIPTION  
The LM5009 Step Down Switching Regulator features  
all of the functions needed to implement a low cost,  
efficient, Buck bias regulator. This device is capable  
of driving a 150 mA load current from a 9.5V to 95V  
input source. The switching frequency can exceed  
600 kHz, depending on the input and output voltages.  
The output voltage may be set from 2.5V to 85V. This  
high voltage regulator contains an N-Channel buck  
switch and internal startup regulator. The device is  
easy to implement and is provided in the 8-pin  
VSSOP and the thermally enhanced 8-pin WSON  
packages. The LM5009 is a well suited alternative to  
a high voltage monolithic or discrete linear solution  
where the power loss becomes unacceptable. The  
regulator’s operation is based on a control scheme  
using an ON time inversely proportional to VIN. This  
feature allows the operating frequency to remain  
relatively constant over load and input voltage  
variations. The control scheme requires no loop  
compensation, resulting in an ultra-fast transient  
response. An intelligent current limit is implemented  
with forced OFF time, which is inversely proportional  
to Vout. This scheme ensures short circuit protection  
while providing minimum foldback. Other features  
include: Thermal Shutdown, Vcc under-voltage  
lockout, Gate drive under-voltage lockout, and  
Maximum Duty Cycle limiter.  
2
•
•
•
•
•
Integrated N-Channel MOSFET  
150-mA output current capability  
Ultra-Fast Transient Response  
No loop compensation required  
Vin feed forward provides constant operating  
frequency  
•
•
•
Switching frequency can exceed 600 kHz  
Highly efficient operation  
2% accurate 2.5V feedback from -40°C to  
125°C  
•
•
•
•
•
Internal startup regulator  
Intelligent current limit protection  
External shutdown control  
Thermal shutdown  
8-Pin VSSOP and thermally enhanced 8-Pin  
WSON packages  
APPLICATIONS  
•
Heat sink eliminator for classic linear regulator  
applications  
•
•
•
12V, 24V, 36V, and 48V rectified AC systems  
42V Automotive  
Non-isolated AC mains charge coupled  
supplies  
•
LED Current Source  
Typical Application Circuit  
9. 5- 95V  
Input  
VIN  
VCC  
C3  
C1  
LM5009  
BST  
R
ON  
C4  
RON/SD  
L1  
SW  
V
OUT  
SHUTDOWN  
C2  
D1  
RCL  
RTN  
R1  
R2  
R
CL  
FB  
Figure 1. 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.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2006–2013, Texas Instruments Incorporated  
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