Datasheet

Vout
T1
T1
Vin
ISOLATED
FEEDBACK
SSOFF
VCC
REF AGNDPGNDSSRESRT
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
LM5045
www.ti.com
SNVS699G FEBRUARY 2011REVISED MARCH 2013
Full-Bridge PWM Controller with Integrated MOSFET Drivers
Check for Samples: LM5045
1
FEATURES
DESCRIPTION
The LM5045 PWM controller contains all of the
2
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
operate on the primary side of an isolated dc-dc
converter with input voltage up to 100V. This highly
Linear Turn-on into Pre-biased Loads
integrated controller-driver provides dual 2A high and
Synchronous Rectifiers Disabled in UVLO
low side gate drivers for the four external brige
mode and Hiccup Mode
MOSFETs plus control signals for the secondary side
Two Independent, Programmable
synchronous rectifier MOSFETs. External resistors
Synchronous Rectifier dead-time Adjustments
program the leading and trailing edge dead-time
between the main and synchronous rectifier control
Four High Current 2A Bridge Gate Drivers
signals. Intelligent startup of the synchronous
Wide-Bandwidth Opto-coupler Interface
rectifiers allows monotonic turn-on of the power
Configurable for either Current Mode or
converter even with pre-bias load conditions.
Voltage Mode Control
Additional features include cycle-by-cycle current
limiting, hiccup mode restart, programmable soft-
Dual-mode Over-Current Protection
start, synchronous rectifier soft-start and a 2 MHz
Resistor Programmed 2MHz Oscillator
capable oscillator with synchronization capability and
Programmable Line UVLO and OVP
thermal shutdown.
PACKAGES
HTSSOP 28 pin
WQFN 28 pin (5mm x 5mm)
Simplified Full-Bridge Power Converter
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

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