AN3580 Designing 1-port PoE System Using PD69201
IntroductionThis application note provides detailed information and circuitry design guidelines for the implementation of a singleport Power over Ethernet (PoE) system, based on Microchip’s 1-port PSE PoE manager, PD69201. This enables thedesigner to integrate PoE capabilities, as defined by the IEEE® 802.3af/at standard into an Ethernet switch or arouter.
A PD69201 based design is intended for low-cost applications where PoE implementation is required but there is noneed for sophisticated features such as power management.
For ease of design and development of an Ethernet switch using PD69201, order evaluation board PD-IM-7601.
The document describes both the managed and the unmanaged configuration for a 1-port system. In the managedconfiguration, PD69201 is controlled by a HOST processor through an I2C bus. In the unmanaged configuration,PD69201 operates as a standalone system without any communication to the host.
PD69201 executes all the real-time functions as specified in the IEEE 802.3af and IEEE 802.3at standards, includingload detection and “AF” and “AT” classification using Multiple Classification Attempts (MCA). PD69201 also supportslegacy or pre-standard detection. PD69201 supports the DC disconnection method, as specified in the IEEE 802.3atstandard. PD69201 provides PD real-time protection through the following mechanisms: overload, under load, overvoltage, over temperature, and short-circuit.
Features• Designed to support IEEE 802.3af and IEEE 802.3at including two event classification• Supports pre-standard PD detection• Single DC voltage input: 32V–57V• Wide temperature range: –40°C to 85°C• Low thermal dissipation (internal 100 mΩ sense resistor)• Includes I2C communication• Continuous port and system data monitoring (port current is not measured)• Power soft-start algorithm• On-chip thermal protection• Voltage and temperature monitoring and protection• Internal Power-on Reset (POR)• MSL1 and RoHS compliant
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 1
Table of Contents
Introduction.....................................................................................................................................................1
1. Features....................................................................................................................................... 1
1. Overview................................................................................................................................................. 3
2. Circuit Description................................................................................................................................... 4
2.1. Main Supply..................................................................................................................................42.2. Grounds........................................................................................................................................42.3. 5V Regulator................................................................................................................................ 42.4. Control..........................................................................................................................................42.5. Indicators......................................................................................................................................42.6. Reference Current Source........................................................................................................... 42.7. Communication Interface............................................................................................................. 52.8. Surge Requirements.................................................................................................................... 62.9. Unmanaged Mode........................................................................................................................72.10. Managed Mode............................................................................................................................ 8
3. Bill of Material for Unmanaged Applications........................................................................................... 9
4. Bill of Material for Managed Applications.............................................................................................. 11
5. Reference Documents.......................................................................................................................... 13
6. Revision History.................................................................................................................................... 14
The Microchip Website.................................................................................................................................15
Product Change Notification Service............................................................................................................15
Customer Support........................................................................................................................................ 15
Microchip Devices Code Protection Feature................................................................................................ 15
Legal Notice................................................................................................................................................. 15
Trademarks.................................................................................................................................................. 16
Quality Management System....................................................................................................................... 16
Worldwide Sales and Service.......................................................................................................................17
AN3580
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 2
1. OverviewThe main mode of operation of the system is a 2-pair PoE port, based on one PD69201 PoE manager.Figure 1-1. 2-Pair Mode
AN3580Overview
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 3
2. Circuit DescriptionThe 1-port, 2-pair configuration shown in Figure 1-1 comprises one PoE manager circuit (PD69201), acting asalternative-A feeding power over the data lines.
2.1 Main SupplyThe PoE system operates within a range of 44 VDC to 57 VDC with no need for additional power supply sources.
This power must be isolated from the switch supply and chassis by 1500 Vrms.
2.2 GroundsThe system utilizes chassis and analog grounds.
The chassis ground is connected to the chassis ground of the switch. This ground plane must be 1500 Vrms isolatedfrom the PoE circuitry.
2.3 5V RegulatorPD69201 includes an internal 5 VDC regulator (DRV_VAUX5) that provides up to 10 mA current. This current isutilized for powering PD69201 and up to 3 mA is available for the components external to the PoE domain. Thosecomponents must also be isolated by 1500 Vrms from the switch circuitry. If more than 3 mA is required, then the 5VDC regulator can be boosted by an external transistor, which enables powering the peripheral circuitry up to 20 mA.
2.4 ControlA reset control signal is utilized to disable the port. PD69201 is still active and able to communicate with the host.
2.5 IndicatorsPD69201 produces a direct LED indication that is utilized to indicate PoE events.
2.6 Reference Current SourceReference for internal voltages within PD69201 is set by a 240 kΩ 1% resistor to AGND.
AN3580Circuit Description
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 4
2.7 Communication InterfaceThe Host CPU issues commands utilizing I2C Communication Protocol to PD69201 through an isolation componentU3 (refer to Figure 2-2).
PD69201 transmits the port and system data.
• Data stream is transmitted through Mode/SDA (pin 4)• Clock stream is transmitted through Power_set/SCL (pin 5)
Setting:
• Port on/off• Modes:
– Alt A/B– Current set (Ilim)– Legacy detection
• Timing:– Tcut– Tlim– UDL (TMPS)
Reading:
• Port voltage• Resistor detection result• Classification result• Port state machine status• Device version
AN3580Circuit Description
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 5
2.8 Surge RequirementsSurge requirements are system requirements and must be tested on a system level. This application note assists thedesigner to implement primary protection mechanisms from outdoor surge events usually located betweenEquipment Under Test (EUT) and external cable.
This application note also contains recommendations for the system containing PD69201 to meet PoE surgerequirements of the standards and levels, as listed in the following table.
Table 2-1. Surge Standards
# Standard Test Circuit Waveform Level [±] TestedChannelCondition
CouplingMode
Comments
1 ITU-T K21 2018
Test 2.1.11
1.2/50 μs–8/20 μs
R1 = 10Ω
R2 = 10Ω
6 kV Channel OFF Differential With additionalexternalcomponents
2 ITU-T K21 2018
Test 2.1.8
1.2 μs/50 μs–8 μs/20 μs
R = 10Ω
6 kV Channel OFF Common With additionalexternalcomponents
3 ITU-T K21 2018
Test 2.1.4a
10 μs/700 μs
R = 25Ω
6 kV Channel OFFand ON
Common With additionalexternalcomponents
4 IEC61000-4-5 :2014 1.2 μs/50 μs
R = 40Ω (4x160Ω)
1 kV Channel OFFand ON
Common —
5 EN55024:2010 10 μs/700 μs
R = 40Ω (4x160Ω)
1 kV Channel OFFand ON
Common —
AN3580Circuit Description
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 6
2.9 Unmanaged ModeIn the unmanaged application, as shown in Figure 2-1, Mode and Power are set by the Mode (pin 4) and Power_set(pin 5) by connecting the external resistor to the GND.
In this application, PD69201 is configured to work in the following mode:
• Resistor on Mode (pin 4) is 34.8 kΩ– Function:
• Alt A (PoE on data pair)• Detection resistor only• Startup Ilim check
• Resistor on Power_set pin is 200 kΩ– Function:
• AT 30W• Perform classification
For different configuration options, see the PD69201 Data Sheet, DS00003454.Figure 2-1. PD69201 Unmanaged Application Circuitry
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Note 1: Optional components for 6kV surge
Note 1
Note 1
Vmain
GND_Analog
VPORT_POS
VPORT_NEG
Vmain
Vmain
VAUX5
VAUX5
Vmain
C8
100n
pd-0805-w
100v
X7R
R168.1KPD-0805
D4
SSL-LX3044GCGreen
LED-EVERLIGHT-204
21
C2100n100v
PD-0805X7R
C71n 2000V
X7R
RV1
12
C41n2000V
R634.8K
PD-0603
R7200K
PD-0603
R4240K
PD-0805
R224.9K
PD-1206-W
C11n2000V
U1
PD69201ILD-TR.PD-DFN-10-4X3-1
Iref1
ATB_N/Disable2
Power_set/SCL5
MODE/SDA4
ATB_P3
LED8
PORT_NEG10
Vaux56
Vmain9
DRV_Vaux57
GND
11
+
C3
100v
47u
ALUD2
STPS1H100APD-SMA
21
TRS1P0640SCLRPPD-SMB-12
21
1
C9
100n
50V
X7RPD-0805
C6100n
100VX7RPD-1206
R510M
PD-0805
C10
4.7uF
25V
X7RPD-1206
D11SMA58AT3
PD-SMA
PD-SMA-W
21
D3
STPS1H100APD-SMA
21
R34.75K
PD-0402
R87.15M
C51n 2000V
X7R
Vport_Neg_out
vmain
Vport_Neg_out
AN3580Circuit Description
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 7
2.10 Managed ModeIn the managed application, as shown in Figure 2-2, xDisable_Port (pin 2) is driven by the HOST CPU to disable thePoE port. When PD69201 detects low level voltage at pin 2, it immediately disables the port.
When driving this line by the HOST CPU, use an opto-coupler to isolate it by 1500 VDC from the switch domain anduse a 4.75 kΩ pull-up resistor to 5V.
In the unmanaged application, connect xDisable_Port (pin 2) with a 4.75 kΩ pull-up resistor to 5V.
Figure 2-2. PD69201 Managed Application Circuitry
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Input voltage 44-57V
PoE sideHost side
Note 1
Note 1
Note 1: Optional components for 6kV surge
Vmain
GND_Analog
VPORT_POS
VPORT_NEG
VmainVmain
Vmain
VAUX5
VAUX55V
VAUX5
To HOSTTo HOST
To HOSTC8
100n
pd-0805-w
100v
X7R
C100.1uF
10VX7RPD-0805
D4Green
21
C6100n
100VX7RPD-1206
R53.32KPD-0805
RV1
12TRS1
P0640SCLRPPD-SMB-12
21
1
C41n
2000V
C2100n100v
PD-0805X7R
R961.9PD-0805
D3
STPS1H100APD-SMA
21
U1
MOC217 R2
PD-SO8
1
2 5
6
7
83
4
Q1MJD47PD-DPAK
1
32
C71n 2000V
X7R
R24.75KPD-0402
R324.9KPD-1206
R168.1KPD-0805
R6240K
PD-0805
C11n
2000V +
C3
100v
47u
ALU
U2
PD69201ILD-TR.PD-DFN-10-4X3-1
Iref1
ATB_N/Disable2
Power_set/SCL5
MODE/SDA4
ATB_P3
LED8
PORT_NEG10
Vaux56
Vmain9
DRV_Vaux57
GN
D1
1
C13
4.7uFX7RPD-1206
C11100n
50V
X7RPD-0805
D2
STPS1H100APD-SMA
21
C51n 2000V
X7R
R43.32KPD-0805
U3
ADUM1251PD-SO8
VDD11
SDA12
SCL13
GND14
GND25SCL26SDA27VDD28
R87.15M
R710M
PD-0805
D11SMA58AT3
PD-SMA
PD-SMA-W
21
C12
4.7uF
25V
X7RPD-1206
C90.1uF
10VX7RPD-0805
Vport_Neg_out
vmain
Disable
Vport_Neg_out
I2C_SCL
I2C_SDA
SDA_ISO I2C_SDASCL_ISO I2C_SCL
Disable
AN3580Circuit Description
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 8
3. Bill of Material for Unmanaged ApplicationsThe following table lists the bill of material for the unmanaged application.
Table 3-1. Bill of Material for Unmanaged Application
Line Qty Reference Description Manufacturer Manufacturer’s P/N
1 4 C1, C4, C5, C7 CAP CRM 1 nF/2000V 10%X7R 1206 SMT
AVX 1206GC102KAT1A
Kemet C1206C102KGRAC
Meritek HC1206XR102K202
2 2 C2, C8 Capacitor, X7R, 100 nF 100V10% 0805
AVX 08051C104KAT2A
Murata GRM21BR72A104KAC4L
Vishay VJ0805Y104KXBTM
3 1 C6 CAP CRM 100 nF 100V 10%X7R 1206 SMT
AVX 12061C104KAT2A
Kemet C1206C104K1RACTU
Murata GRM319R72A104KA01D
4 1 C9 Capacitor, X7R, 100 nF, 50V,10% 0805
AVX 08055C104KAT4A
Kemet C0805X104K5RACTU
Vishay VJ0805Y104KXAMR
5 1 C3 CAP ALU 47 uF 100V 20%10X16
Nichicon UPW2A470MPD
SUNCON 100ME47AX
6 1 C10 CAP CRM X7R 4.7 uF 25V10% 1206 SMT
AVX 12063C475KAT2A
Kemet C1206C475K3RACTU
Murata GRM31CR71E475KA88L
7 1 D1 DIO TVS 58V 40A SRG 400WPK SMA SMT
Diodes Inc. SMAJ58A-13-F
ON Semi 1SMA58AT3G
STMicro SMAJ58A
8 2 D2, D3 DIO SCHOTTKY 100V 1ASMA
ON Semi MBRA1H100T3G
STMicro STPS1H100A
9 1 D4 LED 3 mm Green TH Lumex SSL-LX3044GC
10 1 R1 RES 68.1K 125 mW 1% 0805SMT
Samsung RC2012F6812CS
Yageo RC-0805FR-07 68K1L
11 1 R2 RES 4.75K 62.5 mW 1% 0402SMT
Vishay CRCW04024K75FKED
Yageo RC0402FR-074K75L
12 1 R3 RES 24.9K 250 mW 1% 1206SMT
Vishay CRCW120624K9FKEA
Yageo RC1206FR-0724K9L
13 1 R7 RES 200K 62.5 mW 1% 0603SMT
Vishay CRCW0603200KFKEA
Yageo RC0603FR-07200KL
AN3580Bill of Material for Unmanaged Application...
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 9
...........continuedLine Qty Reference Description Manufacturer Manufacturer’s P/N
14 1 R6 RES 0R 62.5 mW 5% 0603SMT
Samsung RC1608J000CS
Vishay CRCW06030000Z0EA
15 1 R4 RES 240K 125 mW 1% 0805SMT
Vishay CRCW0805240KFKEA
Yageo RC0805FR-07240KL
16 1 R5 RES 10M 125 mW 1% 0805SMT
Vishay CRCW080510M0FKEA
Yageo RC0805FR-0710ML
17 1 R8 RES 7.15M 125 mW 1% 1206SMT
Vishay CRCW12067M15FKEA
Yageo RC1206FR-077M15L
18 1 RV1 VARISTOR 680 Vrms 5 KA 14MM
Epcos/TDK B72214S2421K101
ON Semi NP0640SCT3G
19 1 TRS1 SIDACtor 58V SMB Litlefuse P0640SCLRP
20 1 U2 PoE PSE IC Microchip PD69201ILQ-TR
Notes: • RV1, TRS1, D2, D3, and R8 are optional components for 6 kV surge test requirements.• These components can be removed if the system requires to pass up to 1 kV surge.• Capacitors C5 and C7 are optional components to improve EMI.
AN3580Bill of Material for Unmanaged Application...
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 10
4. Bill of Material for Managed ApplicationsThe following table lists the bill of material for the managed application.
Table 4-1. Bill of Material for Managed Application
Line Qty Reference Description Manufacturer Manufacturer’s P/N
1 4 C1,C4,C5,C7 CAP CRM 1nF/2000V10% X7R 1206 SMT
AVX 1206GC102KAT1A
Kemet C1206C102KGRAC
Meritek HC1206XR102K202
2 2 C2,C8 Capacitor, X7R, 100nF100V 10% 0805
AVX 08051C104KAT2A
Murata GRM21BR72A104KAC4L
Vishay VJ0805Y104KXBTM
3 1 C6 CAP CRM 100nF 100V10% X7R 1206 SMT
AVX 12061C104KAT2A
Kemet C1206C104K1RACTU
Murata GRM319R72A104KA01D
4 1 C11 Capacitor, X7R, 100nF,50V, 10% 0805
AVX 08055C104KAT4A
Kemet C0805X104K5RACTU
Vishay VJ0805Y104KXAMR
5 1 C3 CAP ALU 47uF 100V20% 10X16
Nichicon UPW2A470MPD
SUNCON 100ME47AX
6 2 C9,C10 CAP CRM 100n 10V 10%X7R 0805 SMT
AVX 0805ZC104KAT2A
Kemet C0805C104K8RACTU
Vishay VJ0805Y104KXQCW1BC
7 1 C12 CAP CRM X7R 4.7uF25V 10% 1206 SMT
AVX 12063C475KAT2A
Kemet C1206C475K3RACTU
Murata GRM31CR71E475KA88L
8 1 D1 DIO TVS 58V 40A SRG400WPK SMA SMT
Diodes Inc. SMAJ58A-13-F
ON Semi 1SMA58AT3G
STMicro SMAJ58A
9 2 D2,D3 DIO SCHOTTKY 100V1A SMA
ON Semi MBRA1H100T3G
STMicro STPS1H100A
10 1 D4 LED 3mm Green TH Lumex SSL-LX3044GC
11 1 Q1 TRN NPN 250V 1A 15WD-Pak SMT
Fairchild MJD47TF
ON Semi MJD47T4G
STMicro MJD47T4
12 1 R1 RES 68.1K 125mW 1%0805 SMT
Samsung RC2012F6812CS
Yageo RC-0805FR-07 68K1L
AN3580Bill of Material for Managed Applications
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 11
...........continuedLine Qty Reference Description Manufacturer Manufacturer’s P/N
13 1 R2 RES 4.75K 62.5mW 1%0402 SMT
Vishay CRCW04024K75FKED
Yageo RC0402FR-074K75L
14 1 R3 RES 24.9K 250mW 1%1206 SMT
Vishay CRCW120624K9FKEA
Yageo RC1206FR-0724K9L
15 2 R4,R5 RES 3.32K 125mW 1%0805 SMT
Samsung RC2012F3321CS
Yageo RC0805FRF073K32L
16 1 R6 RES 240K 125mW 1%0805 SMT
Vishay CRCW0805240KFKEA
Yageo RC0805FR-07240KL
17 1 R7 RES 10M 125mW 1%0805 SMT
Vishay CRCW080510M0FKEA
Yageo RC0805FR-0710ML
18 1 R8 RES 7.15M 125mW 1%1206 SMT
Vishay CRCW12067M15FKEA
Yageo RC1206FR-077M15L
19 R9 RES 61.9R 125mW 1%0805 SMT
Vishay CRCW080561R9FKEA
Yageo RC0805FR-0761R9L
20 1 RV1 VARISTOR 680Vrms 5KA14MM
Epcos/TDK B72214S2421K101
21 1 TRS1 SIDACtor 58V SMB Litlefuse P0640SCLRP
ON Semi NP0640SCT3G
22 1 U1 IC OPTOISOLATOR Fairchild MOC217R2-M
23 1 U2 PoE PSE IC Microsemi PD69201ILQ-TR
24 1 U3 IC Hot-Swap I2C Isolator2Ch SO-8
Analog Devices ADUM1251ARZ-RL7
Notes: • RV1, TRS1, D2, D3, and R8 are optional components for 6 kV surge test requirements.• These components can be removed, if the system requires to pass up to 1 kV surge.• Capacitors C5 and C7 are optional components to improve EMI.
AN3580Bill of Material for Managed Applications
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 12
5. Reference DocumentsFor access to documents, device datasheets, or application notes, consult your local Microchip Client EngagementManager or visit our website at www.microchip.com/poe.
• IEEE 802.3af-2003 standard, DTE Power via MDI• IEEE802.3at-2009 standard, DTE Power via MDI• PD69201 Data Sheet, Document Number DS00003454
AN3580Reference Documents
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 13
http://www.microchip.com/poe
6. Revision HistoryRevision Date Description
C November 2020 Following is the summary of changes:• Updated 2.3 5V Regulator.• Updated Figure 2-2.• Changed Table 4-1.
B October 2020 Following is the summary of changes:• Updated Figure 2-1.• Updated Figure 2-2.• Changed Table 3-1.• Changed Table 4-1.• Updated document ID of the PD69201 datasheet to DS00003454 in
the 2.9 Unmanaged Mode and the 5. Reference Documentssections.
• Added the 2.8 Surge Requirements section.
A August 2020 Initial revision
AN3580Revision History
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 14
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AN3580
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 15
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AN3580
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Worldwide Sales and Service
© 2020 Microchip Technology Inc. Application Note DS00003580C-page 17
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Introduction1. Features
Table of Contents1. Overview2. Circuit Description2.1. Main Supply2.2. Grounds2.3. 5V Regulator2.4. Control2.5. Indicators2.6. Reference Current Source2.7. Communication Interface2.8. Surge Requirements2.9. Unmanaged Mode2.10. Managed Mode
3. Bill of Material for Unmanaged Applications4. Bill of Material for Managed Applications5. Reference Documents6. Revision HistoryThe Microchip WebsiteProduct Change Notification ServiceCustomer SupportMicrochip Devices Code Protection FeatureLegal NoticeTrademarksQuality Management SystemWorldwide Sales and Service
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