National Semiconductor POEPHYTEREV-E Скачать руководство пользователя

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Bill of Materials

Part 1. PoE Circuit BOM

ITEM

PART NUMBER

DESCRIPTION

VALUE

BR1

CBR1-D020S

DIODE BRIDGE, SMDIP, CENTRAL

1A, 200V

BR2

CBR1-D020S

DIODE BRIDGE, SMDIP, CENTRAL

1A, 200V

CE1

C2012X7R1E474K

CAPACITOR, CER, CC0805, TDK

0.47 µF, 25V

CE2

CE3

CE4

C5750X7R2A475M

CAPACITOR, CER, CC2220, TDK

4.7 µF, 100V

CE6

C5750X7R2A475M

CAPACITOR, CER, CC2220, TDK

4.7 µF, 100V

CE6

EEV-HA2A220P

CAPACITOR, AL ELEC, PANASONIC

22 µF, 100V

CE7

C3216X5R0J226M

CAPACITOR, CER, CC1206, TDK

22 µF, 6.3V

CE8

C3216X5R0J226M

CAPACITOR, CER, CC1206, TDK

22 µF, 6.3V

CE9

C3216X5R0J226M

CAPACITOR, CER, CC1206, TDK

22 µF, 6.3V

CE10

C3216X5R0J226M

CAPACITOR, CER, CC1206, TDK

22 µF, 6.3V

CE11

C2012X7R1E474K

CAPACITOR, CER, CC0805, TDK

0.47 µF, 25V

CE12

CE13

CE14

CE15

C3216X5R0J226M

CAPACITOR, CER, CC1206, TDK

22 µF, 6.3V

CE16

EMVY6R3ADA331MF80G

CAPACITOR, AL ELEC, CHEMI-ON

330 µF, 6.3V

CE19

C2012X5R1C105K

CAPACITOR, CER, CC0805, TDK

1.0 µF, 16V

CE20

C2012X7R1E474K

CAPACITOR, CER, CC0805, TDK

0.4 µF, 25V

CE21

C0805C473K5RAC

CAPACITOR, CER, CC0805, KEMET

0.047 µF, 50V

CE22

CE23

C0805C102K5RAC

CAPACITOR, CER, CC0805, KEMET

1000 pF, 50V

CE25

C0805C104K5RAC

CAPACITOR, CER, CC0805, KEMET

0.1 µF, 50V

CE26

C0805C473K5RAC

CAPACITOR, CER, CC0805, KEMET

0.047 µF, 50V

CE27

CE28

C4532X7R3D222K

CAPACITOR, CER, CC1812, TDK

2200 pF, 2 kV

CE29

C3216X7R2A104K

CAPACITOR, CER, CC1206, TDK

0.1 µF, 100V

CE31

C0805C473K5RAC

CAPACITOR, CER, CC0805, KEMET

0.047 µF, 50V

CE30

DE1

S3BB-13

DIODE, SMB, DIODE INC

3A, 100V

DE2

DE3

BAT54S

DUAL SCHOTTKY, SOT-23, DIODE INC

DE4

CMHD4448

DIODE, SOD123, CENTRAL

125 mA, 75V

DE5

DE6

CMR1U-01M

DIODE, SMA, CENTRAL

1A, 100V

DE7

PJ-102A

POWER JACK

JE4

JE5

3104-2-00-01-00-00-080

POST, MILL MAX

JE6

3104-2-00-01-00-00-080

POST, MILL MAX

JE7

LE1

DO3308P-682MLD

SM INDUCTOR, COILCRAFT

6.8 µH

LE3

DO3316T-331MLD

SM INDUCTOR, COILCRAFT

0.33 µH

LED1

SSL-LXA228GC-TR11

LED,GREEN, LUMEX

TP1

TP2

www.national.com

AN-1521

Содержание POEPHYTEREV-E

Страница 1: ...rsions There are two versions of PCBs being built which can be identified by the PCB serial number printed along the left edge of the top side the circuit board One version is labelled 551012916 001 Rev A the other 551013040 001 Rev A The first version cannot modify the 3 3V output to higher voltages because it is directly connected to the PHY through inner lay ers It is modified on the second ver...

Страница 2: ...oard setting for the PHY Address is 01h The board may be set to PHY Address 03h by adding jumper J3 Table of Jumpers Jumper Name Function J1 MII Male Connector MII interface J2 MII Header Alternative connection for MII signals J3 PHYAD1 PHY Address strap pin J4 MDIX_EN Enable Disable MDIX mode Default is Auto MDIX Enable J5 LED_CFG Set LED configuration See datasheet J6 Not populated J7 MII 3V3 op...

Страница 3: ... such power levels may violate safety regulations and may cause damage A Note about PoE Input Potentials PoE applications are typically 48V systems in which the no tations GND and 48V normally refer to the high and low input potentials respectively However for easy readability the LM5072 datasheet was written in the positive voltage con vention with positive input potentials referenced to the VEE ...

Страница 4: ...20205201 FIGURE 1 Evaluation Board Schematic Part 1 The Ethernet Circuit www national com 4 AN 1521 ...

Страница 5: ...20205212 FIGURE 2 Evaluation Board Schematic Part 2 RJ45 connectors and Ethernet Magentics 5 www national com AN 1521 ...

Страница 6: ...20205213 FIGURE 3 Evaluation Board Schematic Part 3 the PoE Circuit www national com 6 AN 1521 ...

Страница 7: ...to the center pin of P1 When using TP3 and TP4 for the quick AUX input connection to a bench power supply be aware that TP3 is the high potential pin The diode DE1 provides the re verse protection of the AUX input Please note that TP4 and TP8 are two different return pins for the PoE and AUX inputs respectively They are not connect ed to the same circuit node and they should not be inter changed F...

Страница 8: ...testing can begin PD Interface Operating Modes When connecting into the PoE system the evaluation board will go through the following operating modes in sequence PD signature detection power level classification optional and application of full power See the LM5072 datasheet for details Signature Detection The 25 kΩ PD signature resistor is integrated into the LM5072 IC The PD signature capacitor ...

Страница 9: ...former winding pro duces an output about 2V higher than the startup regulator output thus shutting off the startup regulator and reducing the power dissipation inside the IC Given the low current limit value 15 mA nominal of the high voltage startup regulator the VCC line is not meant to source external loads greater than 3 mA in total The external load of the VCC line is the PoE Power LED indicat...

Страница 10: ...ntain the output voltage This initiates cycle by cycle over current limiting which turns off the main switch when the current sense CS pin exceeds the current limit threshold 2 The current in the internal hot swap MOSFET increases until it is current limited around 800 mA Some overshoot in the current will be observed as it takes time for the current limit amplifier to react and change the operati...

Страница 11: ... pin referenced to the VEE pin 0 5V div Trace 2 The PoE input current 0 5A div FIGURE 9 Retry Mode under 38V PoE Input and Output Over Current Condition STEP RESPONSE Figure 10 shows the step load response at Vin equal to 48V The load current changes in step between 1A and 7A 20205208 Horizontal Resolution 0 5 ms div Trace 1 Load current step changes between 1A and 7A 2A div Trace 2 The 3 3V outpu...

Страница 12: ...showing the peak value of the harmonics Hor izontal 500 kHz div Vertical 5 mV div FIGURE 13 Output Ripple Voltage under Full Load A Note on the Use of Common Mode Choke A location is reserved on the evaluation board for an optional input common mode filter For some special applications that have very strict EMI requirements the common mode filter consisting of the choke U6 and two Y capacitors CE1...

Страница 13: ...3V CE19 C2012X5R1C105K CAPACITOR CER CC0805 TDK 1 0 µF 16V CE20 C2012X7R1E474K CAPACITOR CER CC0805 TDK 0 4 µF 25V CE21 C0805C473K5RAC CAPACITOR CER CC0805 KEMET 0 047 µF 50V CE22 NU CE23 C0805C102K5RAC CAPACITOR CER CC0805 KEMET 1000 pF 50V CE25 C0805C104K5RAC CAPACITOR CER CC0805 KEMET 0 1 µF 50V CE26 C0805C473K5RAC CAPACITOR CER CC0805 KEMET 0 047 µF 50V CE27 NU CE28 C4532X7R3D222K CAPACITOR CE...

Страница 14: ...RESISTOR 20 Ohm RE4 NU RE5 CRCW08053321F RESISTOR 3 32 kΩ RE6 CRCW080524R9J RESISTOR 24 9 Ohm RE7 CRCW080510R0F RESISTOR 10 Ohm RE8 NU RE9 CRCW08051000F RESISTOR 100 Ohm RE10 NU RE11 NU RE12 CRCW08052432F RESISTOR 24 3 kΩ RE13 CRCW08054991F RESISTOR 4 99 kΩ RE14 CRCW12060R47F RESISTOR 0 47 Ohm RE15 CRCW12060R47F RESISTOR 0 47 Ohm RE16 NU RE17 CRCW08055900F RESISTOR 1 kΩ RE18 CRCW08051472F RESISTOR...

Страница 15: ...OR CER CC0603 KEMET 0 1 µF 50V C15 CAPACITOR CER CC0603 KEMET 0 1 µF 50V C16 CAPACITOR CER CC0603 KEMET 0 1 µF 50V C17 CAPACITOR TAN CC7343 10 µF 35V C18 CAPACITOR CER CC0603 KEMET 0 1 µF 50V C20 CAPACITOR TAN CC7343 10 µF 35V C21 CAPACITOR CER CC0603 KEMET 0 1 µF 50V C22 CAPACITOR CER CC0603 KEMET 0 1 µF 50V C23 CAPACITOR CER CC0603 KEMET 0 1 µF 50V C49 CAPACITOR CER CC0603 KEMET E Board ONLY 8 p...

Страница 16: ... Ohm R18 CRCW060333R0J RESISTOR 33 Ohm R19 CRCW060333R0J RESISTOR 33 Ohm R20 CRCW060333R0J RESISTOR 33 Ohm R21 CRCW060333R0J RESISTOR 33 Ohm R22 CRCW060333R0J RESISTOR 33 Ohm R23 CRCW060333R0J RESISTOR 33 Ohm R24 CRCW060333R0J RESISTOR 33 Ohm R25 CRCW060333R0J RESISTOR 33 Ohm R26 CRCW06032200F RESISTOR 220 Ohm R28 CRCW08051501F RESISTOR 1 5 kΩ R29 CRCW06032201F RESISTOR 2 2 kΩ R30 CRCW060324871F R...

Страница 17: ...Ohm R56 CRCW12060R0J RESISTOR 0 Ohm R57 CRCW12060R0J RESISTOR 0 Ohm U1 DP83848 IVV PHY TRANSCEIVER NATIONAL U4 ETH1 230LD TRANSFORMER ETHERNET COILCRAFT E BOARD ONLY U8 NU U9 NU U10 NU UE13 0838 1X1T W6 CONNECTOR INTEGRATED WITH ETHERNET TRANSFORMER BEL STEWARD I BOARD ONLY Y1 FOXSLF 250F 20 CRYSTAL HC49 US 25 MHz Note NU stands for Not Used namely not populated 17 www national com AN 1521 ...

Страница 18: ...PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS BUYERS SHOULD PROVIDE ADEQUATE DESIGN TESTING AND OPERATING SAFEGUARDS EXCEPT AS PROVIDED IN NATIONAL S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS NATIONAL ASSUMES NO LIABILITY WHATSOEVER AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND...

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