Product category:
Power Supply ICs and Controllers
News Release from: Solid State Supplies | Subject: IR1176
Edited by the Electronicstalk Editorial
Team on 03 August 2001
Driver keeps MOSFET gate drive constant
The new IR1176 synchronous rectifier driver from Solid State Supplies minimises loss caused by power MOSFET body drain diode conduction.
Providing constant and proper gate drive to power mosfets regardless of output from the transformer, the new IR1176 synchronous rectifier driver from Solid State Supplies minimises loss caused by the power mosfet body drain diode conduction The IR1176 is a high speed CMOS controller which is designed to drive N-channel power mosfets being used as synchronous rectifiers in high current, high frequency forward convertors with output voltages equal to or below 5V
This article was originally published on Electronicstalk on 6 Feb 2001 at 8.00am (UK)
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The circuit functions by anticipating transformer output transitions, and turns the power mosfets on or off before the transitions to minimise body drain diode conduction and reduce associated losses.
Turn on/off leadtime can be adjusted to accommodate a variety of power mosfet sizes and circuit conditions.
Deriving operating power directly from the secondary side with no ties needed to the primary, the circuit includes Schmitt trigger inputs with double pulse suppression which makes the IR1176 ideally suited to noisy environments.
The device, which has a 4A high peak current drive capability and 2MHz high speed operation, also provides gate drive overlap/dead time control via external components to minimise diode conduction even further.
"To enable design engineers to realise the potential benefits of synchronous rectification", commented Franchise Group Manager Andy Cornwell, "we are now able to provide a reference design kit designated IRDCSYN2".
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