Product category:
Power Supply ICs and Controllers
News Release from: Freescale Semiconductor | Subject: MCZ34670
Edited by the Electronicstalk Editorial
Team on 16 October 2006
Single chip controls power over Ethernet
The MCZ34670 combines a powered device interface port supporting the IEEE802.3af PoE standard and a pulsewidth modulator controller.
By offering significant cost savings and flexibility advantages over traditional AC power, power over Ethernet (PoE) technology continues to gain market momentum To meet this growing demand, Freescale Semiconductor has introduced the MCZ34670, a single-chip PoE controller
This article was originally published on Electronicstalk on 20 Mar 2001 at 8.00am (UK)
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The MCZ34670 combines a powered device (PD) interface port supporting the IEEE802.3af PoE standard and a pulsewidth modulator (PWM) controller.
This high level of integration enables developers to design cost-effective Ethernet-powered end devices with minimal external components and exceptional design flexibility.
"While the use of Power over Ethernet has traditionally been associated with wireless LAN and voice over IP (VoIP) applications, the powered device market continues to gain ground in applications such as RFID tags and network security cameras as IT managers realise the cost savings, flexibility and reliability of PoE", said Marianne D'Aquila, founder and principal analyst of Information Resources.
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"Freescale's MCZ34670 controller provides an integrated, programmable solution to meet the needs of existing and future PoE-powered devices".
The MCZ34670 contains the essential features needed to support the IEEE802.3af standard and provides comprehensive signature detection and power classification functions for PoE applications.
The MCZ34670 also incorporates thermal protection circuitry to help protect powered devices in case of high power dissipation.
Featuring an integrated high-performance switching regulator, the MCZ34670 provides excellent line and load regulation and drives an external power MOSFET with a sense resistor.
The switching frequency is adjustable between 100 and 400kHz with a 50% duty-cycle limit.
This flexibility is advantageous for applications not designed to exceed an on-time of 50% of a given switching frequency and period.
"The demand for VoIP and wireless access points is creating a significantly larger market opportunity for PoE-capable products", said Arman Naghavi, Vice President and General Manager of Freescale's Analogue, Mixed-Signal and Power Division.
"Freescale's integrated PoE controller is designed to enable new types of Ethernet end devices to connect to the Ethernet network and receive power safely, efficiently and cost effectively".
PoE provides a versatile, cost-effective alternative to AC power for a wide variety of network devices, such as wireless access points, IP phones, IP cameras, laptop computers, networked kiosk terminals, security video cameras, emergency lighting systems, building controls, MP3 players and PDA chargers.
These devices traditionally have required both types of connections - AC power and Ethernet.
PoE equipment benefits end users of networked peripheral devices by enabling those devices to receive power over standard category 5 LAN cabling safely, without the need for separate AC adapters or additional power lines.
PoE reduces or eliminates installation costs, saves space and makes it easier to relocate appliances within the workplace.
In addition, PoE-connected appliances can be managed, shut down or reset remotely in an efficient, centralised manner.
The MCZ34670 is available in production quantities at a suggested resale price of US $2.08 in 10,000-piece quantities.
Suggested product pricing is less than $2 in high volume.
The MCZ34670 evaluationboards are available now for a suggested resale price of US $115.
The KIT34670EGEVBE development tool incorporates an IEEE802.3af compliant powered device interface with a 5V isolated output voltage and adjustable UVLO, as well as inrush current.
This board is University of New Hampshire InterOperability Laboratory (UNH-IOL) tested and compliant.
The M52235EVB ColdFire architecture evaluation board with a PoE port using the MCZ34670 powered device is available for the suggested resale price of US $299.
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