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TPS40074 Datasheet

  • TPS40074

  • 具有電壓前饋的中等范圍輸入同步降壓控制器

  • 38頁

  • TI

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TPS40074
SLUS617 鈥?APRIL 2005
MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER
WITH VOLTAGE FEED-FORWARD
FEATURES
鈥?/div>
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Operation Over 4.5-V to 28-V Input Range
Fixed-Frequency Voltage-Mode Controller
Integrated Unity Gain Amplifier for Remote
Output Sensing
Predictive Gate Drive鈩?Generation II for
Improved Efficiency
<1% Internal 700-mV Reference
Input Voltage Feed Forward Control
Prebiased Output Compatible
Internal Gate Drive Outputs for High-Side and
Synchronous N-Channel MOSFETs
Switching Frequency Programmable to 1 MHz
20-Pin QFN Package
Thermal Shutdown Protection
Software Design Tool and EVM Available
The TPS40074 uses voltage feed-forward control
techniques to provide good line regulation over a
wide input voltage range, and fast response to input
line transients. Voltage feed-forward also provides
nearly constant power stage gain with input variation
to ease loop compensation of wide input range
designs. The externally programmable short circuit
protection provides fault current limiting, as well as
hiccup mode operation for low power dissipation in
the presence of a shorted output. The TPS40074 is
packaged in a 20-pin QFN package for better thermal
performance at higher voltages and frequencies, as
well as reduced footprint.
SIMPLIFIED APPLICATION DIAGRAM
VOUT鈭?/div>
(at Load)
1
VOUT+
(at Load)
20
SYNC IN
PowerGood OUT
3
4
5
6
7
8
9
GND
SS
FB
COMP
PGND
LDRV
DBP
SW
10
PGD 18
LVBP 17
RT 16
KFF 15
ILIM 14
VDD 13
HDRV 12
BOOST
11
V
IN
SA+
SA鈭?/div>
TPS40074
2
SAO
SYNC 19
APPLICATIONS
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Power Modules
Networking/Telecom
Industrial
Servers
DESCRIPTION
The TPS40074 is a mid voltage, wide input (4.5-V to
28-V), synchronous, step-down controller, offering
design flexibility for a variety of user programmable
functions, including; soft start, UVLO, operating fre-
quency, voltage feed-forward and high-side FET
sensed short circuit protection.
The TPS40074 incorporates MOSFET gate drivers
for external N-channel high side and synchronous
rectifier (SR) MOSFETs. The gate drive logic incor-
porates second generation predictive anti-cross con-
duction circuitry to prevent simultaneous high side
and synchronous rectifier
conduction,
while
minimizing to eliminating current flow in the body
diode of the SR FET. The TPS40074 allows for
starting into pre-biased outputs by not allowing the
synchronous rectifier FET to turn on until the com-
manded voltage during soft start is greater than the
existing pre-bias voltage.
V
OUT
鈭?/div>
V
OUT
+
UDG鈭?4075
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.
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 漏 2005, Texas Instruments Incorporated

TPS40074 PDF文件相關型號

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