LM5039

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SNVS621D – FEBRUARY 2010 – REVISED MARCH 2013

LM5039 Half-Bridge PWM Controller with Average Current Limit

Check for Samples: LM5039

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FEATURES

DESCRIPTION

The

LM5039

Half-Bridge

Controller/Gate

Driver

2

•

105V / 2A Half-Bridge Gate Drivers

contains all of the features necessary to implement

•

Synchronous Rectifier Control Outputs with

half-bridge topology power converters using voltage

Programmable Delays

mode control with line voltage feed-forward. The

•

High Voltage (105V) Start-up Regulator

LM5039 is a functional variant of the LM5035B half-

bridge PWM controller, featuring average current limit

•

Voltage-mode Control with Line Feed-Forward

during an overload event to balance the center-point

and Volt • Second Limiting

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

•

Programmable Average Current Limit

side gate driver is capable of operating with supply

Balances the Half-Bridge Capacitor Divider

voltages up to 105V. Both the high-side and low-side

Voltage in an Overload Condition

gate drivers are capable of 2A peak. An internal high

voltage startup regulator is included, along with

•

Programmable Hiccup Mode Timer Reduces

programmable line undervoltage lockout (UVLO). The

Power Dissipation During a Continuous

oscillator is programmed with a single resistor to

Overload Event

frequencies up to 2MHz. The oscillator can also be

•

Adjustable Peak Cycle-by-Cycle Over Current

synchronized to an external clock. A current sense

Protection

input provides peak cycle-by-cycle and average

current limit. Other features include adjustable hiccup

•

Resistor Programmed, 2MHz Capable

mode

overload

protection,

soft-start,

revision

Oscillator

reference, and thermal shutdown.

•

Patented Oscillator Synchronization

•

Programmable Line Under-Voltage Lockout

•

Internal Thermal Shutdown Protection

•

Adjustable Soft-Start

•

Direct Opto-Coupler Interface

•

5V Reference Output

PACKAGES

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HTSSOP-20 (Thermally enhanced)

•

WQFN-24 (4mm x 5mm)

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2

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