LM5045 datasheet(12/47 Pages) TI2

12 / 47 page

LM5045

SNVS699H – FEBRUARY 2011 – REVISED JANUARY 2015

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7 Detailed Description

7.1 Overview

The LM5045 PWM controller contains all of the features necessary to implement a full-bridge 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-side and low-side gate drivers for the four external bridge MOSFETs plus control signals

for secondary side synchronous rectifiers. External resistors program the leading and trailing edge dead-time

between the main and synchronous rectifier control signals. Intelligent start-up of synchronous rectifier allows

turnon of the power converter into the prebias loads. Cycle-by-cycle current limit protects the power components

from load transients while hiccup mode protection limits average power dissipation during extended overload

conditions. Additional features include programmable soft-start, soft-start of the synchronous rectifiers, and a 2-

MHz capable oscillator with synchronization capability and thermal shutdown.

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LM5045 Datasheet(PDF) 12 Page - Texas Instruments