ISL6729

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

Product Status: Mass Production

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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6729
Basic Information
Production Status
Mass Production
Topology
Single-Ended
Topology Characteristic
Flyback or Forward (two switch)
Control Mode
Peak Current Mode
UVLO Rising (V)
4.5
UVLO Falling (V)
4.3
VBIAS (max) (V)
7
No-Load Operating Current
3.3 mA
# of PWM Outputs
1
FET Driver Output Current Max
1 A
Max Duty Cycle (%)
100
Qualification Level
Standard
Temperature Range
-40 to +85

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