Tuesday, March 18, 2008

PD controller supporting two-event physical layer is industry’s first

 Controller raises input power to 30 W, targeting IP cameras, 802.11n WAP, and other higher power apps

The AS1135 powered-device (PD) controller is the industry's first such device to implement the two-event physical-layer classification of the upcoming IEEE 802.3at standard. This standard raises the maximum available PD input power to 30 W from the 13 W specified in the existing 802.3af standard. The 30-W level opens a range of new applications including IP security cameras with power, tilt and zoom (PTZ) capability, new multiradio 802.11n wireless access points, WiMAX customer premise equipment, SOHO Ethernet switches, thin clients, and LCDs.

Enabling dynamic negotiation and allocation of power, the two-event classification allows the PD to recognize if it is connected to a Type 1 (802.3af/13-W) or Type 2 (802.3at/30-W) power-sourcing equipment, and vice versa. The protocol informs the 802.3at-compliant PSE that it is safe to increase power delivered to the PD from 13 to 30 W.

Housed in a 5 x 5 20-pin QFN package, the controller provides 802.3at-detect functionality on a logic output pin. The switching frequency of the integrated dc/dc controller can be set from 100 kHz to 500 kHz to optimize the system for parameters including EMI, power consumption and component sizes. ($1.66 ea/1,000 contact company for availability and samples.)

Akros Silicon, Folsom, CA
Information 916-351-8100

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