 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC4267IGN-1-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC4267IGN-1-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
|
|
9 / 32 page  LTC4267-1 9 42671f BLOCK DIAGRAM OVERVIEW The LTC4267-1 is partitioned into two major blocks: a Powered Device (PD) interface controller and a current mode flyback switching regulator. The Powered Device (PD) interface is intended for use as the front end of a PD adhering to the IEEE 802.3af standard, and includes a trimmed 25k signature resistor, classification current source, and an input current limit circuit. With these functions integrated into the LTC4267-1, the signature and power interface for a PD can be built that meets all the requirements of the IEEE 802.3af specification with a minimum of external components. The switching regulator portion of the LTC4267-1 is a constant frequency current mode controller that is opti- mized for Power over Ethernet applications. The regulator is designed to drive a 6V N-channel MOSFET and features soft-start and programmable slope compensation. The integrated error amplifier and precision reference give the PD designer the option of using a nonisolated topology without the need for an external amplifier or reference. The LTC4267-1 has been specifically designed to interface with both IEEE compliant Power Sourcing Equipment (PSE) and legacy PSEs which do not meet the inrush current requirement of the IEEE 802.3af specification. By setting the initial inrush current limit to a low level, a PD using the LTC4267-1 minimizes the current drawn from the PSE during start-up. After powering up, the LTC4267-1 switches to the high level current limit, thereby allowing the PD to consume up to 12.95W if an IEEE 802.3af PSE is present. This low level current limit also allows the LTC4267-1 to charge arbitrarily large load capacitors without exceeding the inrush limits of the IEEE 802.3af specification. This dual level current limit provides the system designer with flexibility to design PDs which are compatible with legacy PSEs while also being able to take advantage of the higher power available in an IEEE 802.3af system. Using an LTC4267-1 for the power and signature inter- face functions of a PD provides several advantages. The LTC4267-1 current limit circuit includes an onboard 100V power MOSFET. This low leakage MOSFET is specified to APPLICATIO S I FOR ATIO |
Similar Part No. - LTC4267IGN-1-TRPBF |
|
Similar Description - LTC4267IGN-1-TRPBF |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
