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 highand
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 soft•
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 highand
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.