Vout

T1

T1

Vin

ISOLATED

FEEDBACK

SSOFF

VCC

REF

AGND

PGND

SS

RES

RT

UVLO

VIN

HO1

BST1 HS1 LO1

CS

LO2

HS2 BST2 HO2

COMP

LM5045 FULL-BRIDGE CONTROLLER

WITH INTEGRATED GATE DRIVERS

RD1

RD2

GATE

DRIVE

ISOLATION

SR1

SR2

VCC

VCC

ISOLATION

BOUNDARY

SLOPE RAMP

SSSR

OVP

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LM5045

SNVS699H – FEBRUARY 2011 – REVISED JANUARY 2015

LM5045 Full-Bridge PWM Controller With Integrated MOSFET Drivers

1 Features

3 Description

The LM5045 PWM controller contains all of the

1

•

Highest Integration Controller for Small Form

features necessary to implement full-bridge topology

Factor, High-Density Power Converters

power converters using either current mode or

•

High-Voltage Start-Up Regulator

voltage mode control. This device is intended to

•

Intelligent Sync Rectifier Start-Up Allows Linear

operate on the primary side of an isolated DC-DC

converter with input voltage up to 100 V. This highly

Turnon Into Prebiased Loads

integrated controller-driver provides dual 2-A high-

•

Synchronous Rectifiers Disabled in UVLO mode

side and low-side gate drivers for the four external

and Hiccup Mode

bridge

MOSFETs

plus

control

signals

for

the

•

Two Independent, Programmable Synchronous

secondary-side

synchronous

rectifier

MOSFETs.

Rectifier Dead-Time Adjustments

External resistors program the leading and trailing

edge dead-time between the main and synchronous

•

Four High-Current 2-A Bridge Gate Drivers

rectifier control signals. Intelligent start-up of the

•

Wide-Bandwidth Optocoupler Interface

synchronous rectifiers allows monotonic turnon of the

•

Configurable for Either Current Mode or Voltage

power converter even with prebias load conditions.

Mode Control

Additional features include cycle-by-cycle current

limiting, hiccup mode restart, programmable soft-

•

Dual-Mode Overcurrent Protection

start, synchronous rectifier soft-start, and a 2-MHz

•

Resistor Programmed 2-MHz Oscillator

capable oscillator with synchronization capability and

•

Programmable Line UVLO and OVP

thermal shutdown.

2 Applications

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

E-Bike

HTSSOP (28)

9.70 mm × 4.40 mm

•

Military: Radar and Electronic Warfare

LM5045

WQFN (28)

5.00 mm × 5.00 mm

•

Power: Telecom DC-DC Module: Analog

(1) For all available packages, see the orderable addendum at

•

Private Branch Exchange (PBX)

the end of the data sheet.

•

Solar Power Inverters

•

Vector Signal Generators

•

Microwave Ovens

•

Point-to-Point Microwave Backhaul

•

Power: Telecom/Server AC/DC Supply: Dual

Controller: Analog

•

Solar Micro-Inverters

•

TETRA Base Stations

•

Washing Machine: Low-End

Simplified Full-Bridge Power Converter

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.