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.