September 22, 2005
Intermediate Bus PWM Controller
The ISL6744 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 control of
switching frequency, adjustable soft-start, precise deadtime
control with deadtimes as low as 35ns, and overcurrent
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.
-40 to 105 8 Ld MSOP
-40 to 105
8 Ld MSOP
-40 to 105 8 Ld SOIC
-40 to 105
8 Ld SOIC
Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
• Precision Duty Cycle and Deadtime 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 Plus Anneal Available (RoHS Compliant)
• Telecom and Datacom Isolated Power
• DC Transformers
• Bus Converters
ISL6744 (SOIC, MSOP)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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