Regulator/DC-DC Converter. LM5115A Datasheet

LM5115A Converter. Datasheet pdf. Equivalent

Part LM5115A
Description Secondary Side Post Regulator/DC-DC Converter
Feature LM5115A www.ti.com SNVS467B – DECEMBER 2006 – REVISED MARCH 2013 LM5115A Secondary Side Post Regu.
Manufacture etcTI
Total Page 29 Pages
Datasheet
Download LM5115A Datasheet



LM5115A
LM5115A
www.ti.com
SNVS467B – DECEMBER 2006 – REVISED MARCH 2013
LM5115A Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down
Tracking
Check for Samples: LM5115A
FEATURES
1
2 Power-up/Power-down Tracking
• Self-synchronization to Main Channel Output
• Leading Edge Pulse Width Modulation
• Valley Current Mode Control
• Standalone DC/DC Synchronous Buck Mode
• Operates from AC or DC Input up to 75V
• Wide 4.5V to 30V Bias Supply Range
• Wide 0.75V to 13.5V Output Range.
• Top and Bottom Gate Drivers Sink 2.5A Peak
• Adaptive Gate Driver Dead-time Control
• Wide Bandwidth Error Amplifier (4MHz)
• Programmable Soft-start
• Thermal Shutdown Protection
• TSSOP-16 Package
DESCRIPTION
The LM5115A controller contains all of the features
necessary to produce multiple tracking outputs using
the Secondary Side Post Regulation (SSPR)
technique. The SSPR technique develops a highly
efficient and well regulated auxiliary output from the
secondary side switching waveform of an isolated
power converter. LM5115A can be also used as a
standalone DC/DC synchronous buck controller
(Refer to Standalone DC/DC Synchronous Buck
Mode section). Regulation of the auxiliary output
voltage is achieved by leading edge pulse width
modulation (PWM) of the main channel duty cycle.
Leading edge modulation is compatible with either
current mode or voltage mode control of the main
output. The LM5115A drives external high-side and
low-side NMOS power switches configured as a
synchronous buck regulator. A current sense
amplifier provides overload protection and operates
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
INPUT
FEEDBACK
Main Converter
PWM Controller
Phase Signal
Main
Output
3.3V
Main
3.3V
+12V
VCC Sync HB
LM5115A
VBIAS
HO
RAMP
HS
TRK/SS
CO
LO
COMP
CS
FB VOUT
PGND AGND
RS Auxiliary
Output
2.5V
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.
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



LM5115A
LM5115A
SNVS467B – DECEMBER 2006 – REVISED MARCH 2013
Connection Diagram
1
CS
2
VOUT
3
AGND
4
CO
5
COMP
6 FB
7
TRK/SS
8
RAMP
VBIAS 16
15
HB
14
HO
13
HS
12
VCC
11
LO
10
PGND
9
SYNC
Figure 2. 16-Lead TSSOP
See Package Numbers PW0016A
www.ti.com
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Product Folder Links: LM5115A
Copyright © 2006–2013, Texas Instruments Incorporated





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