ISL6744A

Intermediate Bus PWM Controller

Product Status: Mass Production

OVERVIEW

The ISL6744A is a low cost, primary side, double-ended controller intended for applications using full and half-bridge topologies for unregulated DC/DC converters. It is a voltage-mode PWM controller designed for half-bridge and full-bridge power supplies. It provides precise switching frequency control, adjustable soft-start, precise dead time control with dead times as low as 35ns, and overcurrent shutdown. The ISL6744A is identical to the ISL6744, but is optimized for higher noise environments.

Low start-up and operating currents allow for easy biasing in both AC/DC and DC/DC applications. This advanced BiCMOS design features low start-up and operating currents, adjustable switching frequency up to 1MHz, 1A FET drivers, and very low propagation delays for a fast response to overcurrent faults.

KEY FEATURES

  • Precision duty cycle and dead time control
  • 100μA start-up current
  • Adjustable delayed overcurrent shutdown and restart
  • Adjustable oscillator frequency up to 2MHz
  • 1A MOSFET gate drivers
  • Adjustable soft-start
  • Internal over-temperature protection
  • 35ns control to output propagation delay
  • Small size and minimal external component count
  • Input undervoltage protection
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6744A
Basic Information
Production Status
Mass Production
iSim Model
YES
Topology
Double-Ended
Topology Characteristic
Half-Bridge or Full Bridge (Telecom) Hard SW
Control Mode
Voltage Mode
UVLO Rising (V)
6.3
UVLO Falling (V)
5.7
VBIAS (max) (V)
20
No-Load Operating Current
3 mA
# of PWM Outputs
2
Max Duty Cycle (%)
100
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +105

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