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LM5045

更新时间： 2024-11-27 12:09:47
品牌 Logo 应用领域
德州仪器 - TI 驱动器控制器
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38页 1273K
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Full-Bridge PWM Controller with Integrated MOSFET Drivers

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LM5045  
www.ti.com  
SNVS699G –FEBRUARY 2011–REVISED MARCH 2013  
Full-Bridge PWM Controller with Integrated MOSFET Drivers  
Check for Samples: LM5045  
1
FEATURES  
DESCRIPTION  
The LM5045 PWM controller contains all of the  
features necessary to implement Full-Bridge topology  
power converters using either current mode or  
voltage mode control. This device is intended to  
operate on the primary side of an isolated dc-dc  
converter with input voltage up to 100V. This highly  
integrated controller-driver provides dual 2A high and  
low side gate drivers for the four external brige  
MOSFETs plus control signals for the secondary side  
synchronous rectifier MOSFETs. External resistors  
program the leading and trailing edge dead-time  
between the main and synchronous rectifier control  
signals. Intelligent startup of the synchronous  
rectifiers allows monotonic turn-on of the power  
converter even with pre-bias load conditions.  
Additional features include cycle-by-cycle current  
limiting, hiccup mode restart, programmable soft-  
start, synchronous rectifier soft-start and a 2 MHz  
capable oscillator with synchronization capability and  
thermal shutdown.  
2
•
Highest Integration Controller for Small Form  
Factor, High Density Power Converters  
•
•
High Voltage Start-up Regulator  
Intelligent Sync Rectifier Start-up Allows  
Linear Turn-on into Pre-biased Loads  
•
•
Synchronous Rectifiers Disabled in UVLO  
mode and Hiccup Mode  
Two Independent, Programmable  
Synchronous Rectifier dead-time Adjustments  
•
•
•
Four High Current 2A Bridge Gate Drivers  
Wide-Bandwidth Opto-coupler Interface  
Configurable for either Current Mode or  
Voltage Mode Control  
•
•
•
Dual-mode Over-Current Protection  
Resistor Programmed 2MHz Oscillator  
Programmable Line UVLO and OVP  
PACKAGES  
•
•
HTSSOP 28 pin  
WQFN 28 pin (5mm x 5mm)  
Simplified Full-Bridge Power Converter  
Vin  
Vout  
T1  
T1  
VCC  
VCC  
HO1 BST1  
VIN  
LO1 SLOPE RAMP CS LO2 HS2 BST2 HO2  
HS1  
GATE  
DRIVE  
ISOLATION  
SR1  
UVLO  
OVP  
SR2  
LM5045 FULL-BRIDGE CONTROLLER  
WITH INTEGRATED GATE DRIVERS  
VCC  
ISOLATED  
FEEDBACK  
COMP  
SSOFF  
RT  
RES  
SS  
RD1 RD2 REF PGND AGND  
SSSR  
ISOLATION  
BOUNDARY  
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 © 2011–2013, Texas Instruments Incorporated  
1234567...38

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