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.