Electronic Components Datasheet Search |
|
PTB48540BAH Datasheet(PDF) 9 Page - Texas Instruments |
|
|
PTB48540BAH Datasheet(HTML) 9 Page - Texas Instruments |
9 / 13 page Application Notes For technical support and further information visit http://power.ti.com 16 15 14 1 2 3 TX1+ TX1– TXCT TD+ TD- TCT 11 10 9 6 7 8 RX1+ RX1– RXCT RD+ RD- RCT 5 4 12 13 N/C N/C 1:1 1:1 PoE Interface Transformer H2019 (Pulse Engineering) J1 RJ-45 Ethernet Connection from PSE PD Circuitry N/C N/C PTB48540B 10 Data Line B 9 Spare Line A 4 Spare Line B 8 Input Ref 7 A - Detect - B A - Class - B Output Inhibit Data Line A +V OUT V OUT Adj –V OUT 3 2 1 5612 11 13 +3.3 V 0 V L1 T1 T2 1 2 3 4 5 6 7 8 Figure 4-1; Power-Over-Ethernet Application Schematic PTB48540 Series Using the PTB48540 Series Module in a Power-Over-Ethernet (PoE) Application The schematic of Figure 4-1 shows an example of how a PTB48540 module may be connected to a PoE compliant system. The connector J1 is the input from the PoE source. In a Power-over-Ethernet (PoE) application, the power and high-frequency data signals share the same conductors in the Ethernet cable. The data and power signals must be separated using an IEEE 802.3af compliant PoE mag- netic module. The magnetic module incorporates the customary isola- tion transformers, T1 and T2. The transformers each include a center tap, across which the dc current from the Ethernet power source equipment (PSE) is conveniently extracted. The transmit and receive hf Ethernet data appear as differential signals to each transformer. These signals are isolated by the transformers, allowing the Ethernet communication content to flow freely between the connector and the powered device (PD) circuitry. The common-mode inductor, L1, is a popular addition to off-the-shelf PoE magnetic modules. The inductor provides additional rejection to common mode noise currents, which may otherwise be present on either the data or power signals. The PTB48540 module complies with the PoE protocols, provides the required isolation, and converts the raw power from the PSE to a precision regulated 3.3-VDC power source for the remote PD circuitry. Not Recommended for New Designs |
Similar Part No. - PTB48540BAH |
|
Similar Description - PTB48540BAH |
|
|
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 |