KTA1142 Power over Ethernet (PoE) Powered Device (PD) Interface

The Kinetic Technologies KTA1142 is a single-chip, highly integrated CMOS solution for PoE PD. It has a PWM controller integrating all the circuitry required to design a smart and efficient converter for PoE and telecom mid-power applications up to 72 W output load. These include Voice over Internet Protocol (VoIP) phones and 5G/LTE base stations, wireless LAN access points, security cameras, and mini personal computers. The KTA1142 fully supports IEEE® 802.3af, IEEE 802.3at, and IEEE 802.3bt standards. It implements all physical layer PD functionalities, including 5-event classification, autoclass to communicate maximum PD power requirements to PSE, Type 1-4 PSE detection, and MPS to lower standby power.

The integrated DC/DC controller features adjustable slope compensation, dual complementary low-side drivers with programmable dead time, programmable soft-start, soft-stop, and programmable frequency dithering. The controller's main target is flyback topology or active clamp forward converter for PoE 802.3bt applications.

The KTA1142 has been architected to address EM emission concerns in PoE applications. The chip implements many design features that minimize the transmission of system common-mode noise onto the unshielded twisted pair (UTP). The device is designed to provide safe, low-impedance discharge paths directly to the earth ground, resulting in superior reliability and circuit protection.