ON Semiconductor adds legacy power supply support to integrated PoE-PD chip

November 11, 2008 -- ON Semiconductor has announced the availability of the NCP1082 and NCP1083, a pair of integrated PoE-PD and DC-DC converter controller chips with auxiliary supply support to power 13 Watt applications and up to 40 Watts for extended, high power PoE+ applications.

November 11, 2008 -- ON Semiconductor has announced the availability of the NCP1082 and NCP1083, a pair of integrated PoE-PD and DC-DC converter controller chips with auxiliary supply support to power 13 Watt applications and up to 40 Watts for extended, high power PoE+ applications.

The NCP1083 joins the company's NCP1081 among the industry's highest power integrated Power over Ethernet power devices (PoE-PD), supporting extended power ranges up to 40 Watt of regulated power delivered to the application load in a 2-pair configuration. The NCP1083 is also capable of providing power via an auxiliary parallel supply.

Both NCP1082 and NCP1083 fully support the IEEE 802.3af standard; the NCP1083 enables the latest draft IEEE 802.3at (D3.0) standard including two event physical layer classification. Typical applications targeted by the 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.

According to the company, 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 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 a proprietary 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, maintains the company. Low on-resistance (Ron) and extended temperature range from -40 deg C to 85 deg C with full operation up to 150 deg 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," comments 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 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, says ON, including programmable frequency, slope compensation, and soft startup.

The NCP1082/3 are currently available. Unit prices are $1.48 for the NCP1082 and $1.85 for the NCP1083 for quantities of 1K and above. NCP1083 evaluation boards are available for $150.

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