描述 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.

特性 Features

? 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