Phase-shifted full-bridge PWM controller with integrated MOSFET drivers


Product details


Topology Phase-Shifted Full-Bridge Control method Current, Voltage VCC (Min) (V) 10 VCC (Max) (V) 14 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) Programmable/1.25V Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 1.5, 2 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, HV Start-up, SR Logic, Soft Start, Soft Switching Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 WQFN (RSG) 28 25 mm² 5 x 5 open-in-new Find other PWM controllers & resonant controllers


  • 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 Prebiased Loads
  • Synchronous Rectifiers Disabled in UVLO Mode
    and Hiccup Mode
  • Two Independent, Programmable Dead-Time
    Adjustments to Enable Zero-Volt Switching
  • Four High-Current 2-A Bridge Gate Drivers
  • Wide-Bandwidth Opto-Coupler Interface
  • Configurable for Either Current Mode or Voltage
    Mode Control
  • Dual-Mode Overcurrent Protection
  • Resistor Programmed 2-MHz Oscillator
  • Programmable Line UVLO and OVP
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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 100 V. This highly integrated controller-driver provides dual 2-A 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 turnon of the power converter even with prebias 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.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM5046 Phase-Shifted Full-Bridge PWM Controller With Integrated MOSFET Drivers datasheet (Rev. H) May 03, 2013
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note AN-2116 SolarMagic ICs in Micro-inverter Applications (Rev. B) May 06, 2013
Application note AN-2126 LM5046 Based Eighth Brick Reference Design (Rev. B) May 06, 2013
User guide AN-2115 LM5046 Evaluation Board (Rev. B) May 03, 2013
Application note Using a Phase-Shifted Full-Bridge Topology in Small Form Factor Power Converters Aug. 31, 2011

Design & development

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Hardware development


The LM5046 evaluation board is designed to provide the design engineer with a fully functional power converter based on the phase-shifted full-bridge topology to evaluate the LM5046 PWM controller. The evaluation board is provided in an industry standard quarter brick footprint.

Design tools & simulation

SNVM008A.ZIP (99 KB) - PSpice Model
SNVMAY9.ZIP (90 KB) - TINA-TI Reference Design
SLUC500.ZIP (570 KB)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options
WQFN (RSG) 28 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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