LM5046_15 Datasheet, PDF (1/48 Pages) Texas Instruments – LM5046 Phase-Shifted Full-Bridge PWM Controller With Integrated MOSFET Drivers

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LM5046
SNVS703H – FEBRUARY 2011 – REVISED NOVEMBER 2014
LM5046 Phase-Shifted Full-Bridge PWM Controller With Integrated MOSFET Drivers
1 Features
•1 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
2 Applications
• E-Bike
• Military: Radar/Electronic Warfare
• Power: Telecom DC/DC Module: Analog
• Private Branch Exchange (PBX)
• Solar Power Inverters
• Vector Signal Generator
• Microwave Oven
• Point-to-Point Microwave Backhaul
• Power: Telecom/Server AC/DC Supply: Dual
Controller: Analog
• Solar Micro-Inverter
• TETRA Base Station
• Washing Machine: Low-End
3 Description
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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM5046
HTSSOP (28)
WSON (28)
9.70 mm x 4.40 mm
5.00 mm x 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Phase-Shifted Full-Bridge Power
Converter
Vin
Vout
Q1
Q3
T1
T1
VCC
Q2
Q4
VCC
HO1 BST1 HS1 LO1 SLOPE RAMP CS LO2 HS2 BST2 HO2
VIN
UVLO
OVP
VCC
SR1
LM5046 PHASE-SHIFTED
SR2
FULL-BRIDGE CONTROLLER
WITH INTEGRATED GATE DRIVERS
SSOFF
COMP
RT RES SS SSSR RD1 RD2 REF PGND AGND
GATE
DRIVE
ISOLATION
ISOLATED
FEEDBACK
ISOLATION
BOUNDARY
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.