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.
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
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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