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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Power Electronics Europe News
 
AEC-approved Schottky rectifiers increase efficiency

The rectifiers are also claimed to have leading thermal performance. They are available in the company’s Clip Bond FlatPower (CFP) packages which have a smaller footprint than SMA/SMB/SMC components.

Trench technology results in low leakage and also greatly reduces the charge, Qrr, stored in the device enabling the Schottky rectifiers to deliver very fast switching, cutting both the switching losses of the rectifier and the losses that are induced in the MOSFET in the same commutation cell. This configuration is commonly used in asynchronous switch mode power converters. The PMEGxxxTx devices additionally provide a wide safe operating area (SOA), delivering an extra safety margin and reducing the risk of thermal runaway compared to parts currently available.

The trench rectifiers combine low forward voltage and very low Qrr for efficiency at high switching speeds in switch mode power converters. Automotive applications including LED lighting, in particular, will benefit from the wide SOA, says the company.

There are now 32 devices in Nexperia’s trench Schottky rectifiers, ranging from 40 to 100V and up to 15A in volume production. A further 17 parts, including the 20A types, are sampling. They are all housed in Clip Bond FlatPower packages CFP3/5/15(B). The small, thermally-efficient packages have become the industry standard for power diodes. The package has a solid copper clip to reduce thermal resistance and optimise transfer of heat into the ambient environment. These features contribute to small and compact PCB designs.

 

 



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