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.