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PoE PWM controller delivers up to 30W

Posted: 15 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:PoE PWM controller? Power over Ethernet? DC/DC controller?

Akros Silicon Inc. has expanded its family of PoE Powered Device (PD) controllers with the introduction of the 30W AS1130. The device provides the same small footprint and high integration as its predecessors, the AS1113 and AS1124, in addition to providing up to 30W power delivery on the network cable, which enables the deployment of high-end security cameras and WLAN access points.

The AS1130, built on standard HV CMOS technology, allows for a highly integrated design that includes the PoE PD controller, low Rds hot swap MOSFET and a DC/DC controller. This level of integration is said to eliminate approximately 18 external components from the application circuit and deliver a greater than 50 percent reduction in the PCB layout footprint compared to competing solutions. The short interconnect to the RJ-45 jack and the controlled PWM output waveform on the DC/DC controller are both key in reducing radiated emissions and meeting industry Electromagnetic Compliance (EMC) requirements, said Akros.

The AS1130 supports IEEE Std. 802.3af-2003 and pre-standard IEEE Std. 802.3at-2006 that defines power delivery of up to 30W on an Ethernet Unshielded Twisted Pair (UTP) cable. It also meets IEC 61000-4-3/3/4/5/6 and IEC 60950 requirements for surge, EMI and isolation. The integrated surge protection for board level surge meets >16.5kV air discharge (IEC61000-4-2), >8kV contact discharge (IEC61000-4-2) and >6kV surge (IEC61000-4-5). The integrated DC/DC converter with reduced EM emission meets CISPR23/FCC part 15 Class B applications.

The AS1130 also offers programmable DC current limit up to 800mA, extended classification levels for higher power PD applications (pre 802.3at compliant), and over temperature protection. The device is available in a RoHS compliant 20-pin QFN package.

Pricing for the AS1130 starts at $1.66 in quantities of 1,000 units.

- Gina Roos

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