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LM5046

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

Product details

Topology Phase-shifted full bridge Control mode Current Duty cycle (max) (%) 100 Switching frequency (max) (kHz) 1000 Features Adjustable switching frequency, Current limiting, Error amplifier, High-voltage startup, Integrated gate drivers, SR logic, Soft start, Soft switching UVLO thresholds on/off (V) Programmable/1.25V Operating temperature range (°C) -40 to 125 Rating Catalog Gate drive (typ) (A) 1.5, 2 Vin (max) (V) 14
Topology Phase-shifted full bridge Control mode Current Duty cycle (max) (%) 100 Switching frequency (max) (kHz) 1000 Features Adjustable switching frequency, Current limiting, Error amplifier, High-voltage startup, Integrated gate drivers, SR logic, Soft start, Soft switching UVLO thresholds on/off (V) Programmable/1.25V Operating temperature range (°C) -40 to 125 Rating Catalog Gate drive (typ) (A) 1.5, 2 Vin (max) (V) 14
HTSSOP (PWP) 28 62.08 mm² 9.7 x 6.4 WQFN (RSG) 28 25 mm² 5 x 5
  • 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
  • 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

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.

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

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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM5046EVAL — Evaluation Board for the LM5046

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.

User guide: PDF
Not available on TI.com
Simulation model

LM5046 PSPICE Model (Rev. A)

SNVM008A.ZIP (99 KB) - PSpice Model
Simulation model

LM5046 TINA-TI Transient Reference Design

SNVMAY9.ZIP (90 KB) - TINA-TI Reference Design
Calculation tool

SLUC500 LM5046 Design Calculator

Supported products & hardware

Supported products & hardware

Products
PWM controllers
LM5046 Phase-shifted full-bridge PWM controller with integrated MOSFET drivers
Package Pins Download
HTSSOP (PWP) 28 View options
WQFN (RSG) 28 View options

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