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LM25115

更新时间： 2024-11-16 02:58:51
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德州仪器 - TI /
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LM25115 Secondary Side Post Regulator Controller

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LM25115 数据手册

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LM25115  
www.ti.com  
SNVS418A –NOVEMBER 2005–REVISED APRIL 2013  
LM25115 Secondary Side Post Regulator Controller  
Check for Samples: LM25115  
1
FEATURES  
DESCRIPTION  
The LM25115 controller contains all of the features  
necessary to implement multiple output power  
converters utilizing 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. 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 LM25115 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.  
2
•
•
Self-synchronization to Main Channel Output  
Free-run Mode for Buck Regulation of DC  
Input  
•
•
Leading Edge Pulse Width Modulation  
Voltage-mode Control with Current Injection  
and Input Line Feed-forward  
•
•
•
•
•
•
•
•
•
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  
TSSOP-16 or Thermally Enhanced WSON-16  
Packages  
Typical Application Circuit  
Phase Signal  
Main  
Output  
3.3V  
FEEDBACK  
INPUT  
Main Converter  
PWM Controller  
Sync  
HB  
HO  
HS  
V
CC  
+12V  
R
S
Auxiliary  
Output  
2.0V  
V
BIAS  
RAMP  
SS  
LO  
CO  
COMP  
FB  
CS  
V
OUT  
PGND AGND  
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 © 2005–2013, Texas Instruments Incorporated  
 
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LM25115 替代型号

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