Power switch improves off-line power supply supply designs

fairchildpowerswitchSan Jose, Calif. — Fairchild Semiconductor claims the FSGM0565R is the only power switch in the industry that integrates drain-current sensing in a 650-V internal avalanche-rugged SenseFET, reducing power dissipation and improving reliability by shortening the over-current time delay to less than 200 ns.

The FPS power switch, available in a 6-lead TO-220F package, for off-line power supplies up to 60 watts (for universal AC input) achieves exceptional standby power consumption in a 66 kHz flyback converter: 120 mW at 265 VAC in with 25 mW of load. This is enabled by the SenseFET, a high-voltage startup circuit that turns off the startup resistor, and “soft burst” operation in standby, saving 30 mW and preventing the converter from generating audible noise, says Fairchild.

Delivering higher reliability, many protection features are built-in, all with auto-restart, to reduce component count in the power supply. These include overload protection, over-voltage protection, abnormal over-current protection, internal thermal shutdown with hysteresis, output short protection and under-voltage lockout. The combination of low component count and high reliability makes this power switch suitable for many applications including LCD TVs and monitors, particularly four-lamp LCD monitors.

Other advanced features include a wide supply-voltage range of 12 to 24 Vdc, built-in 15 ms soft-start and enhanced lightning surge immunity.

Availability: Samples are available now. Delivery is six to eight weeks.
Pricing: $1.00 each in quantities of 1,000.
Resources: Datasheet and product videos.