LM5045 Full-Bridge PWM Controller with Integrated MOSFET Drivers | TI.com

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Full-Bridge PWM Controller with Integrated MOSFET Drivers



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.


  • 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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Part number Order Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM5045 Order now Full-Bridge
10     14     2000     Programmable/1.25V     50     1.5
Current Limiting
HV Start-up
SR Logic
Synchronization Pin    
Catalog     -40 to 125     HTSSOP | 28
WQFN | 28    
28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)
28WQFN: 25 mm2: 5 x 5 (WQFN | 28)