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LM5115

更新时间： 2024-11-15 12:09:51
品牌 Logo 应用领域
德州仪器 - TI 稳压器控制器
页数 文件大小 规格书
24页 931K
描述
LM5115 Secondary Side Post Regulator / Synchronous Buck Controller

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LM5115 数据手册

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LM5115  
www.ti.com  
SNVS343E –MARCH 2005–REVISED MARCH 2013  
LM5115 Secondary Side Post Regulator / Synchronous Buck Controller  
Check for Samples: LM5115  
1
FEATURES  
DESCRIPTION  
The LM5115 is  
a versatile switching regulator  
2
•
•
•
•
Self-Synchronization to Main Channel Output  
Standalone DC/DC Synchronous Buck Mode  
Leading Edge Pulse Width Modulation  
controller. It has two main application configurations.  
The first is utilizing the Secondary Side Post  
Regulation (SSPR) technique to implement multiple  
output power converters. In the second configuration,  
it can be used as a standalone synchronous buck  
Voltage-Mode Control with Current Injection  
and Input Line Feed-Forward  
controller  
(Please  
see  
Standalone  
DC/DC  
•
•
•
•
•
•
•
•
•
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  
Synchronous Buck Mode for more details). 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 LM5115 drives  
external high side and low side NMOS power  
switches configured as a synchronous buck regulator.  
Thermal Shutdown Protection  
TSSOP-16 or Thermally Enhanced WSON-16  
Packages  
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  
Phase Signal  
Main  
Output  
3.3V  
FEEDBACK  
INPUT  
Main Converter  
PWM Controller  
Sync  
HB  
V
CC  
+12V  
LM5115HO  
R
S
Auxiliary  
Output  
2.0V  
V
BIAS  
HS  
LO  
RAMP  
SS  
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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LM5115 替代型号

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