ISL6740A

Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward

Product Status: Mass Production

OVERVIEW

The ISL6740A is an enhanced ISL6740 PWM controller featuring built-in voltage feed forward functionality. It is pin and feature compatible with the ISL6740 double-ended pulse width modulating (PWM) voltage-mode controller, allowing easy drop-in replacement on existing designs.

Voltage feed forward compensates for input voltage variation without intervention of the feedback control loop. It is particularly useful in unregulated bus converters and DC transformers where wide input voltage variation would otherwise result in large output voltage swings.

In addition to voltage feed forward compensation, the ISL6740A features an extremely flexible oscillator that allows precise control of frequency, duty cycle, and deadtime. Deadtimes of under 40ns are easily achievable.

This advanced BiCMOS design features low operating current, adjustable switching frequency up to 1MHz, adjustable soft-start, internal and external over-temperature protection, fault annunciation, and a bidirectional SYNC signal that allows the oscillator to be locked to paralleled units or to an external clock for noise sensitive applications.

KEY FEATURES

  • Input Voltage Feed Forward Compensation
  • Precision Duty Cycle and Deadtime Control
  • Adjustable Delayed Overcurrent Shutdown and Re-Start
  • Adjustable Short Circuit Shutdown and Re-Start
  • Adjustable Oscillator Frequency Up to 2MHz
  • Bidirectional Synchronization
  • Adjustable Input Undervoltage Lockout/Inhibit
  • Tight Tolerance Voltage Reference Over Line, Load, and Temperature
  • Adjustable Soft-Start
  • Fault Signal
  • 95µA Startup Current
  • Internal Over-Temperature Protection
  • System Over-Temperature Protection Using a Thermistor or Sensor
  • Pb-free and ELV, WEEE, RoHS Compliant

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6740A
Basic Information
生产状态
Mass Production
拓扑
Double-Ended
拓扑特征
Half-Bridge or Full Bridge (Telecom) Hard SW
控制模式
Voltage Mode
UVLO上升 (V)
7.25
UVLO下降 (V)
6.75
VBIAS (最大值) (V)
20
无负载工作电流
5 mA
PWM输出数量
2
FET驱动器输出电流最大值
10 mA
最大占空比 (%)
100
资质级别
Standard
CAN 采样
YES
温度范围
-40 to +85

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