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LM5009_15

更新时间： 2024-11-24 01:11:15
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德州仪器 - TI /
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26页 994K
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Wide Input, 100-V,150-mA, Step-Down Switching Regulator

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LM5009  
SNVS402H –FEBRUARY 2006–REVISED OCTOBER 2015  
LM5009 Wide Input, 100-V,150-mA, Step-Down Switching Regulator  
1 Features  
3 Description  
The LM5009 step-down switching regulator features  
1
•
•
•
•
•
Integrated N-Channel MOSFET  
150-mA Output Current Capability  
Ultra-Fast Transient Response  
No Loop Compensation Required  
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 9.5-V to 95-V  
input source. The switching frequency can exceed  
600 kHz, depending on the input and output voltages.  
The output voltage can be set from 2.5 V to 85 V.  
This high-voltage regulator contains an N-channel  
buck switch and an internal startup regulator. The  
device is easy to implement and is provided in 8-pin  
VSSOP and 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 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 ultrafast transient  
response. An intelligent current limit is implemented  
with forced off-time that is inversely proportional to  
VOUT. This scheme ensures short-circuit protection  
and provides minimum foldback. Other features  
include thermal shutdown, VCC undervoltage lockout,  
gate drive undervoltage lockout, and maximum duty  
cycle limiter.  
VIN Feed-Forward Provides Constant Operating  
Frequency  
•
•
•
Switching Frequency Can Exceed 600 kHz  
Highly Efficient Operation  
2% Accurate 2.5-V 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  
2 Applications  
•
Heat Sink Eliminator for Classic Linear Regulator  
Applications  
•
•
•
•
12-V, 24-V, 36-V, and 48-V Rectified AC Systems  
42-V Automotive  
Device Information(1)  
Non-Isolated AC Mains Charge-Coupled Supplies  
LED Current Source  
PART NUMBER  
LM5009  
PACKAGE  
VSSOP (8)  
WSON (8)  
BODY SIZE (NOM)  
3.00 mm × 3.00 mm  
4.00 mm × 4.00 mm  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
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  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
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