DATASHEET ISL6740, ISL6741 FN9111 Rev.7.00 Flexible Double Ended Voltage and Current Mode PWM Controllers Jul 7, 2017 The ISL6740, ISL6741 family of adjustable frequency, low Features power, Pulse Width Modulating (PWM) voltage mode Precision duty cycle and dead time control (ISL6740) and current mode (ISL6741) controllers, is designed for a wide range of power conversion applications using 95A start-up current half-bridge, full bridge and push-pull configurations. These Adjustable delayed overcurrent shutdown and restart controllers provide an extremely flexible oscillator that allows (ISL6740) precise control of frequency, duty cycle and dead time. Adjustable short-circuit shutdown and restart This advanced BiCMOS design features low operating current, Adjustable oscillator frequency up to 2MHz adjustable switching frequency up to 1MHz, adjustable soft-start, internal and external over-temperature protection, Bidirectional synchronization fault annunciation, and a bidirectional SYNC signal that allows Inhibit signal the oscillator to be locked to paralleled units or to an external Internal over-temperature protection clock for noise sensitive applications. System over-temperature protection using a thermistor or Applications sensor Telecom and datacom power Adjustable soft-start Wireless base station power Adjustable input undervoltage lockout File server power Fault signal Industrial power systems Tight tolerance voltage reference over line, load and temperature DC transformers and bus regulators Pb-free (RoHS compliant) Related Literature ISL674x For a full list of related documents, visit our website (x =) CONTROL MODE - ISL6740, ISL6741 product pages 0Voltage Mode 1 Current Mode Ordering Information Pin Configuration ISL6740, ISL6741 PART PART TEMP. RANGE PACKAGE PKG. (16 LD SOIC, 16 LD TSSOP) (Notes 1 2, 3) MARKING (C) (RoHS COMPLIANT) DWG. TOP VIEW ISL6740IBZ (No longer 6740IBZ -40 to +105 16 Ld SOIC M16.15 available or supported) OUTA 1 16 OUTB ISL6740IVZ ISL67 40IVZ -40 to +105 16 Ld TSSOP M16.173 GND 2 15 V REF ISL6741IVZ ISL67 41IVZ -40 to +105 16 Ld TSSOP M16.173 SCSET 3 14 V DD NOTES: C 4 13 R T TD 1. Add -T suffix for 2.5k unit tape and reel options. Please refer to TB347 for details on reel specifications. SYNC 5 12 R TC 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, CS 6 11 OTS molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free V 7 10 FAULT ERROR soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow UV 8 9 SS temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see product information page for ISL6740, ISL6741. For more information on MSL please see techbrief TB363. See Pin Descriptions on page 13 FN9111 Rev.7.00 Page 1 of 30 Jul 7, 2017ISL6740, ISL6741 Table of Contents Functional Block Diagrams . 3 Typical Application (ISL6740EVAL1) - 48V Input DC Transformer, 12V at 8A Output 5 ISL6740EVAL1 Component List 6 Typical Application (ISL6740EVAL2Z) - 36V to 75V Input, Regulated 12V at 8A Output . 7 ISL6740EVAL2Z Component List 8 Typical Application (ISL6741) - 48V to 5V Push-Pull DC/DC Converter . 9 Absolute Maximum Ratings 10 Thermal Information 10 Operating Conditions . 10 Electrical Specifications 10 Typical Performance Curves . 13 Pin Descriptions 13 Functional Description 14 Features . 14 Oscillator . 14 Implementing Synchronization 15 Soft-Start Operation 15 Gate Drive 15 Undervoltage Monitor and Inhibit 15 Overcurrent Operation 16 Short Circuit Operation . 16 Fault Conditions . 16 Thermal Protection 16 Ground Plane Requirements 17 Typical Application . 17 Circuit Element Descriptions 17 Design Criteria 17 Transformer Design 17 MOSFET Selection . 20 Oscillator Component Selection . 20 Output Filter Design 21 Overcurrent Component Selection . 21 Performance 22 Waveforms . 22 Adding Line Only Regulation - Feed Forward 23 Adding Regulation - Closed Loop Feedback 24 Performance 27 References . 27 Revision History 28 About Intersil 28 Package Outline Drawing 29 Small Outline Plastic Packages (SOIC) . 30 FN9111 Rev.7.00 Page 2 of 30 Jul 7, 2017