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SiC MOSFETs for Bridge topologies in three-phase power conversion - issue 6/2019
Efficiency, productivity and legislation are the main drivers in power applications today. Making more out of less energy and saving costs is putting a greater focus on better conversion efficiency...
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Linear voltage regulators operate at automotive temperatures
Designed for high reliability, high temperature applications, the CMT-Antares is Cissoid's latest regulator.
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Power Electronics Europe News
 
LED drivers meet smart lighting and ballast needs

The high efficiency, low standby power ICs deliver high-accuracy constant voltage/ constant current (CV/CC) operation, says the company, making them suitable for smart lighting and ballast applications.

 

The ICs deliver flicker-free output up to 65W, and feature up to 94% efficiency. Standby is as low as 15 mW, and there are configuration options for two- or single-stage PFC support.

 

The ICs exhibit fast transient response for cross regulation performance of parallel LED strings without additional hardware. This also eases implementation of a pulse width modulation dimming interface. As a result, the ICs are suitable for smart residential and commercial fixtures and low-profile ceiling troffers, adds the company.

 

Offering both CV and CC operation, the ICs can be used by lighting manufacturers to reduce the number of product variants, to save on both manufacturing and logistics. The ICs are protected by a thermal foldback system which prevents over-heating while delivering as much light as thermally possible in any circumstance or installation, explains the company.

 

A built-in 650 or 725V MOSFET and the company’s secondary-side FluxLink control eliminates the need for an optocoupler and provides accurate output with better than 3% CV and CC over line, load and temperature. Power conversion for the flyback stage is more than 94% efficient, achieved by using synchronous rectification and quasi-resonant switching eliminating the need for a heatsink. The company cites the example of a 35W, 12V, 2.92A design with an additional PFC circuit that has been demonstrated to be over 89% efficient. Devices offer less than 15mW standby power in universal AC input conditions,even with line voltage sensing, which allows the IC to protect itself from mains voltage surges and swells.

 

A reference design (DER-637) describing a 35W PWM-dimmable LED power supply with efficiency over 89% and a power factor greater than 0.9 is available for download from the Power Integrations website.

 

 

 

 

 



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