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Power switches cut losses by 500mW

Posted: 26 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power switches? PWM controllers? SenseFET? valley-switching?

Power switches that increase efficiency and reduce EMI in power supplies have been tipped by Fairchild Semiconductor. The FSQ0565R and FSQ0765R, the new products in Fairchild's Green FPS line, draw on valley-switching technology and hybrid control circuitry to cut switching losses by up to 500mW and reduce EMI by up to 5dB over hard-switch converter topologies. They are PWM controllers with SenseFETs rated at 650V for quasi-resonant converter applications that feature advanced burst-mode operation to reduce standby power consumption in meeting the 1W Initiative.

Valley-switching operation enables the MOSFETs to turn on with minimum drain voltage and thus will cut EMI dramatically, according to the company. It also facilitates soft-switching operation to boost power conversion efficiency. The devices' hybrid control operation places the power switch in continuous-current-mode at low line and in valley switched discontinuous-current-mode at high line for maximum efficiency.

The Green FPS FSQ0765R and FSQ0565R, in TO-220 packages, include overload protection, over-voltage protection, abnormal over-current protection, internal thermal shutdown with hysteresis, output short protection, and under-voltage lockout.

These switches meet California Energy Commission specs, as well as the requirements of the EU Code of Conduct, and the Group for Energy Efficient Appliances. The FSQ0765R and FSQ0565R utilize Pb-free plating and meet the RoHS requirements.

- Vince Biancomano
-Power Management DesignLine

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