Passive Components


Off-the-shelf transformers for PoE applications said to be highly efficient

19 April 2006 Passive Components

Pulse is offering a series of high efficiency, small footprint, off- the-shelf power transformers for powered device side Power over Ethernet (PoE) products.

They meet IEEE standard 802.3af and have been tested and approved for use with many of the most popular PoE ICs and are available in standard output voltages from 3,3 V to 12 V.

Purchasing standard PoE transformers off-the-shelf significantly reduces both lead time and cost, says Pulse, making them readily available and economical for small volume PoE applications that do not warrant custom designed transformers. Applications for this series include Voice over Internet Protocol (VoIP) phones, security cameras, web cameras, wireless routers, gaming machines, retail point of information systems, building access control systems, and battery chargers for mobile phones and PDAs.

The PoE series consists of 22 powered device side PoE transformers for 3 W, 7 W and 13 W output power levels. Pulse claims that these transformers have 50% lower leakage than other PoE power transformers, reducing the need for inefficient snubber circuits and increasing overall power supply efficiency. Power supply efficiency is crucial for PoE applications because limited input power is available over the Ethernet cable.

The power sourcing unit (PSU) delivers a loosely regulated 48 V (33-75 V) input to the powered device over the Ethernet cable. The powered device converts the 48 V input to a regulated output voltage at the required power level. The PoE standard allows the PD to request one of three levels or classes of power: 3 W/Class 1, 7 W/Class 2, and 13 W/Class 3. Pulse has designed 3,3 V, 5,0 V, and 12,0 V output voltage transformers at each of the three power levels.





Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Cutting-edge hybrid capacitors
Avnet Silica Passive Components
Panasonic Industry recently announced the launch of the ZVU Series Hybrid Capacitors, a cutting-edge solution tailored to meet the escalating demands of advanced electronic systems.

Read more...
Low-profile tantalum chip capacitors
Electrocomp Passive Components
These general-purpose tantalum capacitors from Kyocera AVX are available in multiple case sizes with low profile options.

Read more...
Coupled inductor for high-performance applications
Passive Components
This coil with MnZn core is characterised by its high permeability and extremely low RDC values, which achieves excellent power density and very high efficiency.

Read more...
Power inductors
iCorp Technologies Passive Components
he HTF-MP series is more suitable for complex multiphase power supply applications in design, effectively meeting the needs of ultra-thin and high-power devices.

Read more...
SMT power inductors
Future Electronics Passive Components
The Würth Elektronik WE-MXGI SMT power inductors are the latest addition to Würth Elektronik’s moulded power inductor series, engineered for high-frequency power applications.

Read more...
Large capacitance MLCCs at 100 V
RS South Africa Passive Components
TDK Corporation has expanded its CGA series for automotive multilayer ceramic capacitors to 10 µF at 100 V in 3225 size.

Read more...
Film and mica capacitors
Actum Passive Components
By utilising various polymer dielectrics plastics, Exxelia film and mica capacitors meet most technical requirements and serve all functions from standard filtering to specialised applications.

Read more...
Power-over-coax inductors
RS South Africa Passive Components
TDK has expanded the ADL3225VF series of wire-wound inductors for automotive power-over-coax (PoC).

Read more...
Thick film power resistors
Electrocomp Passive Components
Vishay has released a new product to the market, its thick film power resistor, which is offered in a clip-mount TO-247 package.

Read more...
Compact EMI suppression capacitors
RS South Africa Passive Components
These new components from TDK are 20% smaller than previous models and meet Grade III Test B standards for temperature, humidity, and bias.

Read more...









While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.




© Technews Publishing (Pty) Ltd | All Rights Reserved