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
Turn-on into Prebiased Loads
• Synchronous Rectifiers Disabled in UVLO Mode
and Hiccup Mode
• Two Independent, Programmable Dead-Time
Adjustments to Enable Zero-Volt Switching
• Four High-Current 2-A Bridge Gate Drivers
• Wide-Bandwidth Opto-Coupler 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/Electronic Warfare
• Power: Telecom DC/DC Module: Analog
• Private Branch Exchange (PBX)
• Solar Power Inverters
• Vector Signal Generator
• Microwave Oven
• Point-to-Point Microwave Backhaul
• Power: Telecom/Server AC/DC Supply: Dual
Controller: Analog
• Solar Micro-Inverter
• TETRA Base Station
• Washing Machine: Low-End

3 Description
The LM5046 PWM controller contains all of the
features necessary to implement a phase-shifted fullbridge
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 100 V. This
highly integrated controller-driver provides dual 2-A
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
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.