DATASHEET ISL6742B FN8565 Rev 1.00 Advanced Double-Ended PWM Controller November 3, 2015 The ISL6742B is a high-performance double-ended PWM Features controller with advanced synchronous rectifier control and Synchronous rectifier control outputs with adjustable current limit features. It is suitable for both current- and delay/advance voltage-mode control methods. Adjustable average current signal The ISL6742B includes complemented PWM outputs for Synchronous Rectifier (SR) control. The complemented 3% tolerance cycle-by-cycle peak current limit outputs may be dynamically advanced or delayed relative to Fast current sense to output delay the main outputs using an external control voltage. Adjustable oscillator frequency up to 2MHz Its advanced current sensing circuitry employs sample and Adjustable dead time control hold methods to provide a precise average current signal. Voltage- or current-mode operation Suitable for average current limiting, a technique which virtually eliminates the current tail-out common to peak Separate RAMP and CS inputs for voltage feed-forward or current limiting methods, it is also applicable to current current-mode applications sharing circuits and average current mode control. Tight tolerance error amplifier reference over line, load, and This advanced BiCMOS design features an adjustable oscillator temperature frequency up to 2MHz, internal over-temperature protection, 175A start-up current precision dead time control and short propagation delays. Supply UVLO Additionally, multipulse suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur. Adjustable soft-start 70ns leading edge blanking Ordering Information Multipulse suppression TEMP. PACKAGE Internal over-temperature protection PART PART RANGE (RoHS PKG. Pb-free (RoHS compliant) (Notes 1, 2, 3) MARKING (C) Compliant) DWG. ISL6742BAAZA ISL6742 BAAZ -40 to +105 16 Ld QSOP M16.15A Applications ISL6742BEVAL3Z Evaluation Board NOTES: Half-bridge, full-bridge, interleaved forward, and push-pull converters 1. Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. Telecom and datacom power 2. These Intersil Pb-free plastic packaged products employ special Wireless base station power Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which File server power is RoHS compliant and compatible with both SnPb and Pb-free Industrial power systems soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free Related Literature requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information AN1890, ISL6742BEVAL3Z Power Converter 36V to 75V page for ISL6742B. For more information on MSL, please see tech Input, 12V Output Up to 10A brief TB363. FN8565 Rev 1.00 Page 1 of 20 November 3, 2015ISL6742B Table of Contents Pin Configuration 3 Pin Descriptions . 3 Functional Block Diagram 5 Typical Applications . 6 Absolute Maximum Ratings . 8 Thermal Information . 8 Operating Conditions 8 Electrical Specifications . 8 Typical Performance Curves . 11 Functional Description 11 Features . 11 Oscillator . 11 Soft-Start Operation 12 Gate Drive 12 Overcurrent Operation 12 Voltage Feed-Forward Operation . 13 Implementing Synchronization 14 Synchronous Rectifier Outputs and Control 14 Slope Compensation . 15 Parallel Operation . 17 Average Current Mode Control . 18 Fault Conditions . 18 Thermal Protection 18 Ground Plane Requirements 18 References . 18 Revision History 19 About Intersil 19 Package Outline Drawing 20 FN8565 Rev 1.00 Page 2 of 20 November 3, 2015