1 Features

• 105-V and 2-A Half-Bridge Gate Drivers

• Synchronous Rectifier Control Outputs With

Programmable Delays

• Reduced Dead Time Between High and Low-Side

Drive for Higher Maximum Duty Cycle.

• High Voltage (105 V) Start-Up Regulator

• Voltage Mode Control With Line Feedforward and

Volt Second Limiting

• Resistor Programmed, 2-MHz Capable Oscillator

• Programmable Line Undervoltage Lockout and

Overvoltage Protection

• Internal Thermal Shutdown Protection

• Adjustable Soft Start

• Versatile Dual Mode Overcurrent Protection With

Hiccup Delay Timer

• Cycle-by-Cycle Overcurrent Protection

• Direct Opto-coupler Interface

• Logic Level Synchronous Rectifier Drives

• 5-V Reference Output

• Packages:

– HTSSOP-20 (Thermally Enhanced)

– WQFN-24 (4mm × 5mm)

2 Applications

• Industrial Power Converters

• Telecom Power Converters

3 Description

The LM5035C half-bridge controller and gate driver

contains all of the features necessary to implement

half-bridge topology power converters using voltage

mode control with line voltage feedforward.

The LM5035C is a functional variant of the LM5035B

half-bridge PWM controller. The amplitude of the SR1

and SR2 waveforms are 5 V instead of the VCC level.

Also, the soft-stop function is disabled in the

LM5035C.

The LM5035, LM5035A, LM5035B, and LM5035C

include a floating high-side gate driver, which is

capable of operating with supply voltages up to

105 V. Both the high-side and low-side gate drivers

are capable of 2-A peak. An internal high-voltage

start-up regulator is included, along with

programmable line undervoltage lockout (UVLO) and

overvoltage protection (OVP). The oscillator is

programmed with a single resistor to frequencies up

to 2 MHz. The oscillator can also be synchronized to

an external clock. A current sense input and a

programmable timer provide cycle-by-cycle current

limit and adjustable hiccup mode overload protection.

The differences between LM5035, LM5035A,

LM5035B, and LM5035C are summarized in the

Device Comparison Table.