1FEATURES

2• 105V / 2A Half-Bridge Gate Drivers

• Synchronous Rectifier Control Outputs with

Programmable Delays

• High Voltage (105V) Start-up Regulator

• Voltage-mode Control with Line Feed-Forward

and Volt • Second Limiting

• Programmable Average Current Limit

Balances the Half-Bridge Capacitor Divider

Voltage in an Overload Condition

• Programmable Hiccup Mode Timer Reduces

Power Dissipation During a Continuous

Overload Event

• Adjustable Peak Cycle-by-Cycle Over Current

Protection

• Resistor Programmed, 2MHz Capable

Oscillator

• Patented Oscillator Synchronization

• Programmable Line Under-Voltage Lockout

• Internal Thermal Shutdown Protection

• Adjustable Soft-Start

• Direct Opto-Coupler Interface

• 5V Reference Output

PACKAGES

• HTSSOP-20 (Thermally enhanced)

• WQFN-24 (4mm x 5mm)

DESCRIPTION

The LM5039 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

LM5039 is a functional variant of the LM5035B half-

bridge PWM controller, featuring average current limit

during an overload event to balance the center-point

of the half-bridge capacitor divider. The floating high-

side gate driver 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). 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 provides peak cycle-by-cycle and average

current limit. Other features include adjustable hiccup

mode overload protection, soft-start, revision

reference, and thermal shutdown.