Full-bridge PWM controller with Integrated MOSFET Drivers


Product details


Topology Full-Bridge, Half-Bridge, Push-Pull Control method Current, Voltage VCC (Min) (V) 10 VCC (Max) (V) 14 Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) Programmable/1.25V Frequency (Max) (kHz) 2000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 1.5, 2 Features Current Limiting, HV Start-up, Multi-topology, SR Logic, Synchronization Pin 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
    Turnon Into Prebiased Loads
  • Synchronous Rectifiers Disabled in UVLO mode and
    Hiccup Mode
  • Two Independent, Programmable Synchronous Rectifier
    Dead-Time Adjustments
  • Four High-Current 2-A Bridge Gate Drivers
  • Wide-Bandwidth Optocoupler 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 LM5045 PWM controller contains all of the features necessary to implement full-bridge topology power converters 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-side 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 leading and trailing edge dead-time between the main and synchronous rectifier control signals. Intelligent start-up 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
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet LM5045 Full-Bridge PWM Controller With Integrated MOSFET Drivers datasheet (Rev. H) Jan. 28, 2015
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guides AN-2111 LM5045 Evaluation Board (Rev. C) May 06, 2013
Application notes AN-2213 LM5045 Based 240W Power Converter Using Full-Wave (Rev. A) May 06, 2013
Application notes Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) May 06, 2013
Technical articles Introducing TI’s new Power Solution Video Series Apr. 19, 2012

Design & development

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Hardware development

document-generic User guide
The LM5045 evaluation board is designed to provide the design engineer with a fully functional power converter based on the full-bridge topology to evaluate the LM5045 PWM controller. The evaluation board is provided in an industry standard quarter brick footprint.

Design tools & simulation

SNVM006.ZIP (350 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SLUC501A.ZIP (522 KB)

CAD/CAE symbols

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

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