1FEATURES

2? 105V / 2A Half-Bridge Gate Drivers

? Synchronous Rectifier Control Outputs with

Programmable Delays

? Synchronous Rectifiers Turned Off in

Shutdown Modes.

? Reduced Deadtime Between High and Low

Side Drive for Higher Maximum Duty Cycle.

? High Voltage (105V) Start-up Regulator

? Voltage mode Control with Line Feed-Forward

and Volt Second Limiting

? Resistor Programmed, 2MHz Capable

Oscillator

? Programmable Line Under-Voltage Lockout

and Over-Voltage Protection

? Internal Thermal Shutdown Protection

? Adjustable Soft-Start

? Versatile Dual Mode Over-Current Protection

with Hiccup Delay Timer

? Cycle-by-Cycle Over-Current Protection

? Direct Opto-coupler Interface

? 5V Reference Output

PACKAGES

? TSSOP-20

? WQFN-24 (4mm x 5mm)

DESCRIPTION

The LM5035B Half-Bridge Controller/Gate Driver

contains all of the features necessary to implement

half-bridge topology power converters using voltage mode control with line voltage feed-forward.

The LM5035B is a functional variant of the LM5035A

half-bridge PWM controller. The LM5035B provides

higher maximum duty cycle and higher start-up

regulator output current than the LM5035A or

LM5035. Also, the Synchronous Rectifier drive

outputs of the LM5035B are held low in shutdown

modes.

The LM5035, LM5035A, and LM5035B include a

floating high-side gate driver, which is capable of operating with supply voltages up to 105V. Both the

high-side and low-side gate drivers are capable of 2A

peak. An internal high voltage startup 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 2MHz. The oscillator can also be

synchronized to an external clock. A current sense

input and a programmable timer provide cycle-bycycle

current limit and adjustable hiccup mode

overload protection.The differences between LM5035,

LM5035A, LM5035B, and LM5035C are summarized

in Table 2.