September 11, 2008
Improved Bridge Controller with Precision
Dead Time Control
The ISL6745A is a low-cost double-ended voltage-mode
PWM controller designed for half-bridge and full-bridge
power supplies and line-regulated bus converters. It
provides precise control of switching frequency, adjustable
soft-start, and overcurrent shutdown. In addition, the
ISL6745A allows for accurate adjustment of MOSFET
non-overlap time (“deadtime”) with deadtimes as low as
35ns, allowing power engineers to optimize the efficiency of
open-loop bus converters. The ISL6745A also includes a
control voltage input for closed-loop PWM and line voltage
feed-forward functions. The ISL6745A is identical to the
ISL6745, 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 also features adjustable switching
frequency up to 1MHz, 1A FET drivers, and very low
propagation delays for a fast response to overcurrent faults.
The ISL6745A is available in a space-saving MSOP-10
package and is guaranteed to meet rated specifications over
a wide -40°C to +105°C temperature range.
(Pb-Free) DWG. #
-40 to +105 10 Ld MSOP M10.118
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination
finish, which is 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 Re-Start
• 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)
• Half-bridge Converters
• Full-bridge Converters
• Line-regulated Bus Converters
• AC/DC Power Supplies
• Telecom, Datacom, and File Server Power
(10 LD MSOP)
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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