San Jose, Calif.—Fairchild Semiconductor's new Green FPS switches, the FSQ0565R and FSQ0765R, draw on valley-switching technology and "hybrid control" circuitry to cut switching losses by up to 500 mW and EMI by up to 5 dB over hard-switch converter topologies. As with the company's Green FPS products, the FSQ0565R and FSQ0765R, which are PWM controllers with SenseFETs rated at 650 volts for quasi-resonant converter applications, feature advanced burst-mode operation to reduce standby power consumption in meeting the 1-Watt 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 (CCM) at low line and in valley switched discontinuous-current-mode (DCM) at high line for maximum efficiency.
The Green FPS FSQ0765R and FSQ0565R, in TO-220 packages, include overload protection (OLP), over-voltage protection (OVP), abnormal over-current protection (AOCP), internal thermal shutdown (TSD) with hysteresis, output short protection (OSP), and under-voltage lockout (UVLO).
These switches meet California Energy Commission (CEC) specs, as well as the requirements of the EU Code of Conduct, and the Group for Energy Efficient Appliances (GEEA). The FSQ0765R and FSQ0565R utilize lead-free (Pb-free) plating and meet the requirements of the European Union's Directive on the restriction of the use of certain substances (RoHS).
Availability: Samples are available now. The FSQ0565R, rated at 3 amps and 60 watts (at 85-285 VAC), and the FSQ0765R, rated at 3.5 amps and 70 watts, are priced at 80 cents and $1.18, respectively, in 1k pieces. Delivery is 8 weeks ARO.
Fairchild Semiconductor, 1-800-341-0392, http://www.fairchildsemi.com