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LM5045_15

更新时间： 2024-10-02 01:08:23
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德州仪器 - TI /
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Full-Bridge PWM Controller With Integrated MOSFET Drivers

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LM5045  
SNVS699H –FEBRUARY 2011–REVISED JANUARY 2015  
LM5045 Full-Bridge PWM Controller With Integrated MOSFET Drivers  
1 Features  
3 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 100 V. This highly  
integrated controller-driver provides dual 2-A high-  
side 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 leading and trailing  
edge dead-time between the main and synchronous  
rectifier control signals. Intelligent start-up of the  
synchronous rectifiers allows monotonic turnon of the  
power converter even with prebias 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.  
1
•
Highest Integration Controller for Small Form  
Factor, High-Density Power Converters  
•
•
High-Voltage Start-Up Regulator  
Intelligent Sync Rectifier Start-Up Allows Linear  
Turnon Into Prebiased Loads  
•
•
Synchronous Rectifiers Disabled in UVLO mode  
and Hiccup Mode  
Two Independent, Programmable Synchronous  
Rectifier Dead-Time Adjustments  
•
•
•
Four High-Current 2-A Bridge Gate Drivers  
Wide-Bandwidth Optocoupler Interface  
Configurable for Either Current Mode or Voltage  
Mode Control  
•
•
•
Dual-Mode Overcurrent Protection  
Resistor Programmed 2-MHz Oscillator  
Programmable Line UVLO and OVP  
Device Information(1)  
2 Applications  
PART NUMBER  
LM5045  
PACKAGE  
HTSSOP (28)  
WQFN (28)  
BODY SIZE (NOM)  
9.70 mm × 4.40 mm  
5.00 mm × 5.00 mm  
•
•
•
•
•
•
•
•
•
E-Bike  
Military: Radar and Electronic Warfare  
Power: Telecom DC-DC Module: Analog  
Private Branch Exchange (PBX)  
Solar Power Inverters  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Vector Signal Generators  
Microwave Ovens  
Point-to-Point Microwave Backhaul  
Power: Telecom/Server AC/DC Supply: Dual  
Controller: Analog  
•
•
•
Solar Micro-Inverters  
TETRA Base Stations  
Washing Machine: Low-End  
Simplified Full-Bridge Power Converter  
Vin  
Vout  
T1  
T1  
VCC  
VCC  
HO1 BST1 HS1 LO1 SLOPE RAMP CS LO2 HS2 BST2 HO2  
VIN  
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
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
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 		Based Eighth Brick Reference Board Input operating range: 36V to 75V

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