ON Semiconductor Brings Legacy Power Supply Support to the Industry’s Highest Power Integrated PoE-PD Interface

The NCP1083 is also capable of providing power via an auxiliary parallel supply. Both NCP1082 and NCP1083 fully support the IEEE 802.3af standard and the NCP1083 enables the latest draft IEEE 802.3at (D3.0) standard including two event physical layer classification. Typical applications targeted by NCP1082 and NCP1083 include VoIP phones, wireless access points, industrial Ethernet I/O modules, programmable logic controllers (PLCs), pan-tilt-zoom (PTZ) and dome security cameras, and other applications that require an auxiliary supply.

The NCP1082/3 support normal PoE operation when power is available on the Ethernet cable. In the event Ethernet power is not available, the device accepts an auxiliary supply input to power the application. This approach eliminates the need for a second DC-DC converter and therefore drastically reduces the bill of materials. The new devices support a wide range of external input voltages from 9 V to 57 V.

ON Semiconductor’s integrated NCP1082/3 PoE-PD devices are pin-compatible with the company’s existing NCP1080/1 PoE-PD devices in the TSSOP-EP 20 pin package. Pin compatibility allows the customer to easily mix-and-match different PoE capabilities on different platforms.

The NCP1082/3 leverages ON Semiconductor’s automotive qualified high-voltage SmartPower process to provide superior cable ESD and surge protection levels compared to other integrated PD and DC-DC converter controllers. Low on-resistance (Ron) and extended temperature range from -40°C to 85°C with full operation up to 150°C junction temperature allows the NCP1082/3 to achieve record power levels while operating in harsh environments.

“The auxiliary supply capability facilitates the transition from traditional power sources to Power over Ethernet” said Koen Geirnaert, ON Semiconductor’s PoE-PD product marketing manager. “Combined with the high power capability this feature enables a broad range of applications”

The devices' integrated DC-DC converter controller facilitates the implementation of popular and proven single-ended power supply topologies such as fly-back, buck and forward converters for both configurations and uses a control scheme based on peak current control. The controllers have all the features needed for a flexible, robust and highly efficient design, including programmable frequency, slope compensation and soft startup.