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LM25115A bảng dữ liệu(PDF) 1 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM25115A Secondary Side Post Regulator/DC-DC Converter with Power-Up/Power-Down Tracking
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LM25115A bảng dữ liệu(HTML) 1 Page - Texas Instruments

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VBIAS
FB
AGND
COMP
SYNC
VCC
TRK/SS
HB
HO
HS
LO
PGND
VOUT
CO
CS
RAMP
LM25115A
+12V
RS
FEEDBACK
Main Converter
PWM Controller
INPUT
Phase Signal
3.3V
Main
Auxiliary
Output
2.5V
Main
Output
3.3V
LM25115A
www.ti.com
SNVS501B – FEBRUARY 2007 – REVISED APRIL 2013
LM25115A Secondary Side Post Regulator/DC-DC Converter with Power-Up/Power-Down
Tracking
Check for Samples: LM25115A
1
FEATURES
DESCRIPTION
The LM25115A controller contains all of the features
2
Power-up/Power-down Tracking
necessary to produce multiple tracking outputs using
Self-synchronization to Main Channel Output
the
Secondary
Side
Post
Regulation
(SSPR)
Leading Edge Pulse Width Modulation
technique. The SSPR technique develops a highly
efficient and well regulated auxiliary output from the
Valley Current Mode Control
secondary side switching waveform of an isolated
Standalone DC/DC Synchronous Buck Mode
power converter. LM25115A can be also used as a
Operates from AC or DC Input up to 42V
standalone
DC/DC
synchronous
buck
controller
(Refer to Standalone DC/DC Synchronous Buck
Wide 4.5V to 30V Bias Supply Range
Mode section). Regulation of the auxiliary output
Wide 0.75V to 13.5V Output Range.
voltage is achieved by leading edge pulse width
Top and Bottom Gate Drivers Sink 2.5A Peak
modulation (PWM) of the main channel duty cycle.
Leading edge modulation is compatible with either
Adaptive Gate Driver Dead-time Control
current mode or voltage mode control of the main
Wide Bandwidth Error Amplifier (4MHz)
output. The LM25115A drives external high-side and
Programmable Soft-start
low-side NMOS power switches configured as a
Thermal Shutdown Protection
synchronous
buck
regulator.
A
current
sense
amplifier provides overload protection and operates
TSSOP-16 package
over a wide common mode input range. Additional
features include a low dropout (LDO) bias regulator,
error amplifier, precision reference, adaptive dead
time
control
of
the
gate
signals
and
thermal
shutdown.
Typical Application Circuit
Figure 1. Simplified Multiple Output Power Converter Utilizing SSPR Technique
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 © 2007–2013, 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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