ISL6729

Low-Cost Single-Ended Current-Mode PWM for Microcontroller-Based Power Converters

OVERVIEW

The ISL6729 pulse width modulating (PWM) current mode controller is designed for power conversion applications that are based on a microcontroller, or other device, which can generate a digital clock signal at the desired switching frequency. Similar to the ISL684x family of products, the ISL6729 provides the basic current mode PWM control features, but eliminates the error amplifier, the oscillator, and the reference. An external clock signal applied to the oscillator input provides the time base and sets the maximum duty cycle. The reduced feature set is ideal for those applications where a microcontroller is available to provide the monitor and control functions. The analog PWM provides the cycle-by-cycle peak-current mode control, leaving the monitor and control overhead to the microcontroller.

KEY FEATURES

  • 5V operation
  • 1A MOSFET gate driver
  • 400μA startup current
  • 30ns propagation delay current sense to output
  • Fast transient response with peak-current mode control
  • Switching frequency to 2MHz
  • 20ns rise and fall times with 1nF output load
  • Maximum duty cycle determined by clock input duty cycle
  • Tight tolerance current limit threshold
  • Pb-free (RoHS compliant)

PARAMETRICS

Parameters
ISL6729
Basic Information
Production Status
量産中
トポロジ
Single-Ended
トポロジ特性
Flyback or Forward (two switch)
制御モード
Peak Current Mode
UVLO立ち上がり (V)
4.5
UVLO立ち下がり (V)
4.3
VBIAS (V) (max)
7
無負荷動作電流
3.3 mA
PWM出力数
1
FETドライバ最大出力電流
1 A
最大デューティサイクル (%)
100
認定レベル
Standard
温度範囲
-40 to +85

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