LM5046 Phase Shifted Full Bridge PWM Controller With Integrated MOSFET Drivers LM5046 SNVS703H FEBRUARY 2011 REVISED NOVEMBER 2014 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 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 the primary FETs Device Information 1 PART NUMBER LM5046 PACKAGE HTSSOP 28 WSON 28 BODY SIZE NOM 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 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 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 VoutT1T1VinISOLATED FEEDBACK SSOFFVCCREFAGNDPGNDSSRESRTUVLOVINHO1BST1HS1LO1CSLO2HS2BST2HO2COMPLM5046 PHASE SHIFTED FULL BRIDGE CONTROLLERWITH INTEGRATED GATE DRIVERSRD1RD2GATEDRIVEISOLATIONSR1SR2VCCVCCISOLATION BOUNDARYSLOPERAMPSSSROVPQ1Q2Q3Q4ProductFolderSample BuyTechnicalDocumentsTools SoftwareSupport Community LM5046 SNVS703H FEBRUARY 2011 REVISED NOVEMBER 2014 www ti com Table of Contents 1 Features 1 2 Applications 1 3 Description 1 4 Revision History 2 5 Pin Configuration and Functions 3 6 Specifications 6 6 1 Absolute Maximum Ratings 6 6 2 Handling Ratings 6 6 3 Recommended Operating Conditions 6 6 4 Thermal Information 7 6 5 Electrical Characteristics 7 6 6 Typical Characteristics 10 7 Detailed Description 12 7 1 Overview 12 7 2 Functional Block Diagram 12 7 3 Feature Description 13 7 4 Device Functional Modes 22 8 Application and Implementation 25 8 1 Application Information 25 8 2 Typical Application 25 9 Power Supply Recommendations 37 10 Layout 37 10 1 Layout Guidelines 37 10 2 Layout Example 37 11 Device and Documentation Support 39 11 1 Trademarks 39 11 2 Electrostatic Discharge Caution 39 11 3 Glossary 39 12 Mechanical Packaging and Orderable Information 39 4 Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current version Changes from Revision G March 2013 to Revision H Added Pin Configuration and Functions section Handling Rating table Feature Description section Device Functional Modes Application and Implementation section Power Supply Recommendations section Layout section Device and Documentation Support section and Mechanical Packaging and Orderable Information section 1 Changes from Revision F March 2013 to Revision G Changed layout of National Data Sheet to TI format 25 Page Page 2 Submit Documentation Feedback Copyright 2011 2014 Texas Instruments Incorporated Product Folder Links LM5046 www ti com 5 Pin Configuration and Functions LM5046 SNVS703H FEBRUARY 2011 REVISED NOVEMBER 2014 28 Pin HTSSOP Top View 28 Pin WQFN Top View Copyright 2011 2014 Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links LM5046 5 mm x 5 mm WQFN 28SSRESHS2HO2BST2SSSRREFRTSLOPERD2COMPAGNDRD1PGNDLO1VCCLO2BST1SS OFFSR1OVPRAMPUVLOCSHS1HO1VINSR2TSSOP28VINPGNDLO1VCCLO2SR2SR1HS2HO2BST2HS1BST1HO1COMPRD2UVLOOVPCSRAMPSSSRAGNDSLOPERTREFRD1SSSS OFFRES LM5046 SNVS703H FEBRUARY 2011 REVISED NOVEMBER 2014 NAME 38 PIN TSSOP NO PIN 28 PIN TSSOP NO WQFN NO Pin Functions I O DESCRIPTION APPLICATION INFORMATION www ti com UVLO OVP O TP RAMP CS SLOPE COMP REF RT SY NC AGND RD1 RD2 1 2 4 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 25 26 27 28 1 2 3 4 5 6 7 8 I I I I I I I I I I O O Overvoltage Protection Input to PWM Comparator Line Undervoltage Lockout An external voltage divider from the power source sets the shutdown and standby comparator levels When UVLO reaches the 0 4 V threshold the VCC and REF regulators are enabled At the 1 25 V threshold the SS pin is released and the controller enters the active mode Hysteresis is set by an internal current sink that pulls 20 A from the external resistor divider An external voltage divider from the input power supply sets the shutdown level during an over voltage condition Alternatively an external NTC thermistor voltage divider can be used to set the shutdown temperature The threshold is 1 25 V Hysteresis is set by an internal current that sources 20 A of current into the external resistor divider Modulation ramp for the PWM comparator This ramp can be a signal representative of the primary current current mode or proportional to the input voltage feed forward voltage mode This pin is reset to GND at the end of every cycle If CS exceeds 750 mV the PWM output pulse will be terminated entering cycle by cycle current limit An internal switch holds CS low for 40 nS after either output switches high to blank leading edge transients A ramping current source from 0 to 100 A is provided for slope compensation in current mode control This pin can be connected