OVERVIEW

The ISL6726 is a highly featured single-ended PWM controller intended for applications using the active clamp forward converter topology in either n- or p-channel active clamp configurations, the asymmetric half-bridge topology, and the standard forward topologies with synchronous rectification. It is a current-mode PWM controller with many features designed to simplify its use. Among its many features are a precision oscillator which allows accurate control of the deadtime and maximum duty cycle, bi-directional synchronization with 180° phase shift for interleaving applications, adjustable soft-start and soft-stop, a low power disable mode, and average current limit for brick-wall overcurrent protection.

This advanced BiCMOS design features low start-up and operating currents, adjustable switching frequency to greater than 1MHz, high current FET drivers, and very low propagation delays for a fast response to overcurrent faults.

KEY FEATURES

  • Precision Maximum Duty Cycle and Deadtime Control
  • 125µA Typical Start-up Current
  • Adjustable Peak and Average Current Limit Protection
  • Programmable Oscillator Frequency
  • Bi-Directional Synchronization with 180° Phase Shift for Interleaved Converter Applications
  • Adjustable Soft-Start and Selectable Soft-Stop
  • Selectable Minimum Duty Cycle Clamp for Synchronous Rectifier Applications
  • Programmable Slope Compensation
  • Supports N- and P-Channel Active Clamp FETs
  • Programmable Switch Timing Between Main and Active Clamp Outputs
  • Programmable Undervoltage Lock-Out (UV)
  • Input Voltage Dependent Duty Cycle Clamp
  • ENABLE Input with Low Power Disable
  • Internal Over-Temperature Protection
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6726
Topology
Single-Ended
# of PWM Outputs
1
Topology Characteristic
Active clamp forward
FET Driver Output Current Max
1 A
Control Mode
Active clamp forward, Asymmetric half-bridge, Interleaved active clamp forward
Max Duty Cycle (%)
100
UVLO Rising (V)
7.65
Qualification Level
Standard
UVLO Falling (V)
6.23
Can Sample
YES
VBIAS (max) (V)
20
Temperature Range
-40 to +105
No-Load Operating Current
10 mA

Confirm below disclaimers

Input Renesas account name and password