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ISL6745A Improved Bridge Controller with Precision Dead Time Control

Intersil


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Product Description:
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 -40C to +105C temperature range.


Product Specifications:
* 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)

Control Mode: Voltage Mode
UVLO Rising (V) 6.3
UVLO Falling (V)5.7
VBIAS (max) (V) 20
No-Load Operating Current (mA)3
# of PWM Outputs 2
FET Driver IOUT (max) (A) 1
Max Duty Cycle (%)100



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