LM5039 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Half-Bridge PWM Controller with Average Current Limit

LM5039
February 16, 2010
Half-Bridge PWM Controller with Average Current Limit
General 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 cur-
rent 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 fre-
quencies up to 2MHz. The oscillator can also be synchronized
to an external clock. A current sense input provides peak cy-
cle-by-cycle and average current limit. Other features include
adjustable hiccup mode overload protection, soft-start, revi-
sion reference, and thermal shutdown.
Packages
• TSSOP-20EP (Thermally enhanced)
• LLP-24 (4mm x 5mm) [Coming soon]
Features
■ ^{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}
Simplified Application Diagram
© 2010 National Semiconductor Corporation 301005
30100501
www.national.com