LM5045_15 Datasheet, PDF (1/46 Pages) Texas Instruments – 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
•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
2 Applications
• E-Bike
• Military: Radar and Electronic Warfare
• Power: Telecom DC-DC Module: Analog
• Private Branch Exchange (PBX)
• Solar Power Inverters
• 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
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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM5045
HTSSOP (28)
WQFN (28)
9.70 mm × 4.40 mm
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Full-Bridge Power Converter
Vin
Vout
T1
VCC
T1
VCC
HO1 BST1 HS1 LO1 SLOPE RAMP CS LO2 HS2 BST2 HO2
VIN
UVLO
OVP
VCC
SR1
LM5045 FULL-BRIDGE CONTROLLER ^SR2
WITH INTEGRATED GATE DRIVERS
SSOFF
COMP
RT RES SS SSSR RD1 RD2 REF PGND AGND
GATE
DRIVE
ISOLATION
ISOLATED
FEEDBACK
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.