Ic/Transistor Pinouts - JBL ES250PW Service Manual

ES250PW
LM5008
High Voltage (100V) Step Down Switching Regulator
General Description
The LM5008 Step Down Switching Regulator features all of
the functions needed to implement a low cost, efficient, Buck
bias regulator. This high voltage regulator contains an 100 V
N-Channel Buck Switch. The device is easy to implement
and is provided in the MSOP-8 and the thermally enhanced
LLP-8 packages. The regulator is based on a hysteretic
control scheme using an ON time inversely proportional to
V . This feature allows the operating frequency to remain
IN
relatively constant. The hysteretic control requires no loop
compensation. 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 protection features include: Ther-
mal Shutdown, V
voltage lockout, and Max Duty Cycle limiter
Connection Diagram
Ordering Information
Order Number
LM5008MM
LM5008SD
© 2004 National Semiconductor Corporation
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under-voltage lockout, Gate drive under-
CC
Package Type
MSOP-8
LLP-8
DS200979
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Features
n Integrated 100V, N-Channel buck switch
n Internal V
regulator
CC
n No loop compensation required
n Ultra-Fast transient response
n On time varies inversely with line voltage
n Operating frequency remains constant with varying line
voltage and load current
n Adjustable output voltage
n Highly efficient operation
n Precision internal reference
n Low bias current
n Intelligent current limit protection
n Thermal shutdown
Typical Applications
n Non-Isolated Telecommunication Buck Regulator
n Secondary High Voltage Post Regulator
n +42V Automotive Systems
Package
n MSOP - 8
n LLP - 8 (4mm x 4mm)
20097902
8-Lead MSOP, LLP
NSC Package Drawing
MUA08A
SDC08A
30
October 2004
Supplied As
1000 Units on Tape and Reel
1000 Units on Tape and Reel
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