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LM25115A_15

更新时间： 2024-11-16 01:12:59
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德州仪器 - TI /
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LM25115A Secondary Side Post Regulator/DC-DC Converter with Power-Up/Power-Down Tracking

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LM25115A_15 数据手册

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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  
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. LM25115A 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 LM25115A drives external high-side and  
low-side NMOS power switches configured as a  
2
•
Power-up/Power-down Tracking  
•
•
•
•
•
•
•
•
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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 42V  
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  
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.  
TSSOP-16 package  
Typical Application Circuit  
Phase Signal  
Main  
Output  
3.3V  
FEEDBACK  
Main Converter  
PWM Controller  
INPUT  
SYNC  
VCC  
HB  
+12V  
LM25115A  
R
S
HO  
Auxiliary  
Output  
2.5V  
VBIAS  
RAMP  
TRK/SS  
CO  
Main  
3.3V  
HS  
LO  
CS  
COMP  
VOUT  
PGND AGND  
FB  
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 © 2007–2013, Texas Instruments Incorporated  
 
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