LM5046_14 Datasheet, PDF (1/42 Pages) Texas Instruments – Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers

LM5046
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SNVS703F – FEBRUARY 2011 – REVISED JANUARY 2012
LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
Check for Samples: LM5046
FEATURES
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•2 Highest Integration Controller for Small Form
Factor, High Density Power Converters
• High Voltage Start-up Regulator
• Intelligent Sync Rectifier Start-up Allows
Linear Turn-on into Pre-biased Loads
• Synchronous Rectifiers Disabled in UVLO
mode and Hiccup Mode
• Two Independent, Programmable Dead-Time
Adjustments to Enable Zero-Volt Switching.
• Four High Current 2A Bridge Gate Drivers
• Wide-Bandwidth Opto-coupler Interface
• Configurable for either Current Mode or
Voltage Mode Control
• Dual-mode Over-Current Protection
• Resistor Programmed 2MHz Oscillator
• Programmable Line UVLO and OVP
DESCRIPTION
The LM5046 PWM controller contains all of the features necessary to implement a Phase-Shifted Full-Bridge
topology power converter using either current mode or voltage mode control. This device is intended to operate
on the primary side of an isolated dc-dc converter with input voltage up to 100V. This highly integrated controller-
driver provides dual 2A high and low side gate drivers for the four external bridge MOSFETs, plus control signals
for the secondary side synchronous rectifier MOSFETs. External resistors program the dead-time to enable zero-
volt switching of the primary FETs. Intelligent startup of the synchronous rectifiers allows monotonic turn-on of
the power converter even with pre-bias load conditions. Additional features include cycle-by-cycle current limiting,
hiccup mode restart, programmable soft-start, synchronous rectifier soft-start and a 2 MHz capable oscillator with
synchronization capability and thermal shutdown.
Packages
• TSSOP-28
• WQFN-28 (5mm x 5mm)
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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