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LM5046_14

更新时间： 2024-10-02 02:58:27
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德州仪器 - TI /
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41页 1572K
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Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers

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LM5046  
www.ti.com  
SNVS703G –FEBRUARY 2011–REVISED MARCH 2013  
LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers  
Check for Samples: LM5046  
1
FEATURES  
PACKAGES  
2
•
Highest Integration Controller for Small Form  
Factor, High Density Power Converters  
•
•
TSSOP-28  
WQFN-28 (5mm x 5mm)  
•
•
High Voltage Start-up Regulator  
DESCRIPTION  
Intelligent Sync Rectifier Start-up Allows  
Linear Turn-on into Pre-biased Loads  
The LM5046 PWM controller contains all of the  
features necessary to implement a Phase-Shifted  
Full-Bridge topology power converter 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  
bridge MOSFETs, plus control signals for the  
secondary side synchronous rectifier MOSFETs.  
External resistors program the dead-time to enable  
zero-volt switching of the primary FETs. 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-  
•
•
Synchronous Rectifiers Disabled in UVLO  
mode and Hiccup Mode  
Two Independent, Programmable Dead-Time  
Adjustments to Enable Zero-Volt Switching.  
•
•
•
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  
start and  
a
2
MHz capable oscillator with  
synchronization capability and thermal shutdown.  
Simplified Phase-Shifted Full-Bridge Power Converter  
Vin  
Vout  
Q3  
Q4  
Q1  
Q2  
T1  
T1  
VCC  
VCC  
HO1 BST1  
VIN  
LO1 SLOPE RAMP CS LO2 HS2 BST2 HO2  
HS1  
GATE  
DRIVE  
ISOLATION  
SR1  
UVLO  
OVP  
LM5046 PHASE-SHIFTED  
FULL-BRIDGE CONTROLLER  
SR2  
VCC  
WITH INTEGRATED GATE DRIVERS  
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  
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