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LM5035C

SNVS631D – JANUARY 2010 – REVISED OCTOBER 2016

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8 Detailed Description

8.1 Overview

The LM5035C PWM controller contains all of the features necessary to implement half-bridge voltage-mode

controlled power converters. The LM5035C provides two gate driver outputs to directly drive the primary side

power MOSFETs and two signal level outputs to control secondary synchronous rectifiers through an isolation

interface. Secondary side drivers, such as the LM5110, are typically used to provide the necessary gate drive

current to control the sync MOSFETs. Synchronous rectification allows higher conversion efficiency and greater

power density than conventional PN or Schottky rectifier techniques. The LM5035C can be configured to operate

with bias voltages ranging from 8 V to 105 V. Additional features include line undervoltage lockout, cycle-by-cycle

current limit, voltage feedforward compensation, hiccup mode fault protection with adjustable delays, soft start, a

2-MHz capable oscillator with synchronization capability, precision reference, thermal shutdown, and

programmable volt•second clamping. These features simplify the design of voltage-mode half-bridge DC-DC

power converters. See Functional Block Diagram.