ISL6742

Advanced Double-Ended PWM Controller with Synchronous Rectifier Control and Average Current Limit

Product Status: Mass Production

OVERVIEW

The ISL6742 is a high-performance double-ended PWM controller with advanced synchronous rectifier control and current limit features. It is suitable for both current- and voltage-mode control methods.

The ISL6742 includes complemented PWM outputs for Synchronous Rectifier (SR) control. The complemented outputs may be dynamically advanced or delayed relative to the main outputs using an external control voltage.

Its advanced current sensing circuitry employs sample and hold methods to provide a precise average current signal. Suitable for average current limiting, a technique which virtually eliminates the current tail-out common to peak current limiting methods, it is also applicable to current sharing circuits and average current-mode control.

This advanced BiCMOS design features an adjustable oscillator frequency up to 2MHz, internal over-temperature protection, precision dead time control, and short propagation delays. Additionally, multipulse suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur.

KEY FEATURES

  • Synchronous rectifier control outputs with adjustable delay/advance
  • Adjustable average current signal
  • 3% Tolerance cycle-by-cycle peak current limit
  • Fast current sense to output delay
  • Adjustable oscillator frequency up to 2MHz
  • Adjustable dead time control
  • Voltage- or current-mode operation
  • Separate RAMP and CS inputs for voltage feed-forward or current-mode applications
  • Tight tolerance error amplifier reference over line, load, and temperature
  • 175µA start-up current
  • Supply UVLO
  • Adjustable soft-start
  • 70ns leading edge blanking
  • Multipulse suppression
  • Internal over-temperature protection
  • Pb-Free (RoHS compliant)

PARAMETRICS

Parameters
ISL6742
Basic Information
生产状态
Mass Production
iSim模型
YES
拓扑
Double-Ended
拓扑特征
Half-Bridge or Full Bridge (Telecom) Hard SW
控制模式
Voltage, Peak Current, or Average Current Mode
UVLO上升 (V)
8.75
UVLO下降 (V)
7
VBIAS (最大值) (V)
20
无负载工作电流
5 mA
PWM输出数量
4
FET驱动器输出电流最大值
10 mA
最大占空比 (%)
99
资质级别
Standard
CAN 采样
YES
温度范围
-40 to +85

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