2 layers88.9 × 46.4 mm
2 layers60.3 × 52.7 mm
Chassis
crawford/PoE3A base platform for PoE peripherals
- Size
- 60.3 × 52.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 108
- Nets
- 124
- Pads
- 374
- Tracks, vias
- 803, 45
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 20 Jan 2018
- Updated
- 20 Oct 2026
Overview
Chassis is an open-source printed circuit board by crawford, from the crawford/PoE repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 60.3 × 52.7 mm with 108 parts on 124 nets, routed with 803 tracks and 45 vias.
It is built around the TCMT1107, TPS23754PWPR and MMDT3906, with the PT61017PEL and SIR422DP among its other parts. Its parts include 35 capacitors, 25 resistors, 6 ICs, 6 diodes and 3 transistors. It belongs with the Silicon Labs (EFR32, EFM) boards of this library.
Main components
5
TCMT1107
SOP-4-1.27mm-40℃~+100℃ 1 1.35V 160% 3.75kV 300mV@1mA,10mA 5.5us@2mA,100Ω 50mA 60mA 6V 70V 7us 80% DC Phototransistor SOP-4-1.27mm Transistor, Photovoltaic Output Optoisolators ROHSVishay IntertechnologyTransistor, Photovoltaic Output Optoisolators
TPS23754PWPR
HTSSOP-20-EP-40℃~+125℃ 100V 30W 5.1V 970mA IEEE 802.3 at(PoE+) Powered Device (PD) HTSSOP-20-EP Power Over Ethernet (PoE) Controllers ROHSTexas InstrumentsPower Over Ethernet (PoE) Controllers
MMDT3906
SOT-363-55℃~+150℃ 100nA 2 PNP 200mA 200mW 300 300MHz 300mV 40V 5V PNP SOT-363 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
PT61017PEL
SMD,12.8x6.9mm0℃~+70℃ 10/100 Base-T 1CT:1CT 350uH Single port SMD,12.8x6.9mm Pulse Transformers(LAN) ROHSBournsPulse Transformers(LAN)
SIR422DP
PDFN-8L(5x6)-55℃~+150℃ 1 N-channel 1.21nF 2.2V 390pF 40V 41nC 5.12nF 60A 89W 8mΩ@4.5V PDFN-8L(5x6) MOSFETs ROHSTECH PUBLICMOSFETs
README
hardware/sync-flyback-eval/README.mdSynchronous Flyback Converter Evaluation
Test Plan
Core Converter
Populate:
- FB1-FB2
- R2-R3, R5-R14, R19-R21, R23-R25
- RV1-RV4
- L1-L2
- C1-C12, C15-C17, C22, C24, C26-C28
- D1-D2, D6
- Q1-Q3A
- U2
- T1-T2
Tune:
- Set RV1 to 22.1 kΩ.
- Set RV2 to 69.8 kΩ.
- Set RV3 to 69.8 kΩ.
- Set RV4 to 115 kΩ.
Test:
-
Insufficient supply a. Apply 5-volt supply across VDDA (TP10) and VSSA (TP11). b. Measure voltage across R7 and verify that it is 0 V.
-
24-volt supply a. Apply 470-ohm resistance across +12V (TP8) and GNDD (TP13). b. Apply 24-volt supply across VDDA and VSSA. c. Measure voltage across R8 and verify that it is 255 μV. d. Measure voltage across R7 and verify that it is ~181 μV.
-
48-volt supply a. Connect 470-ohm resistance across +12V (TP8) and GNDD (TP13). b. Connect 24-volt supply across VDDA and VSSA. c. Measure voltage across R8 and verify that it is 255 μV. d. Measure voltage across R7 and verify that it is ~128 μV.
Power over Ethernet
Populate:
- J1
- TR1
- C13-C14, C18-C21, C25
- R1, R15-R18
- D3-D5
Test:
-
Passive PoE a. Connect to passive (24-volt) PoE PS. b. Measure voltage across VDDA and VSSA and verify that it is ~24 V. c. Verify that the yellow LED turns on.
-
PoE+ a. Connect 470-ohm resistance across +12V and GNDD. b. Connect to PoE+ PS. c. Measure voltage across VDDA and VSSA and verify that is is 37-57 V. d. Verify that the yellow LED turns on.
Parts
108| Qty | Value | Footprint | References |
|---|---|---|---|
| 22 | TestPoint | TestPoint:TestPoint_Pad_1.5x1.5mm | 3V3, GND2, PD0, PD1, PD2, PD3, PD4, PD5, PD6, PD8, PE4, PE5, PE6, PE7, PF10, PF11 +6 |
| 9 | 0u1 | Capacitor_SMD:C_0402_1005Metric | C1, C5, C14, C27, C29, C31, C32, C33, C35 |
| 5 | 1u | Capacitor_SMD:C_0402_1005Metric | C3, C4, C9, C11, C16 |
| 4 | 0u01 | Capacitor_SMD:C_0402_1005Metric | C18, C19, C20, C21 |
| 4 | 75 | Resistor_SMD:R_0402_1005Metric | R15, R16, R17, R18 |
| 3 | 10 | Resistor_SMD:R_0402_1005Metric | R3, R6, R10 |
| 2 | 0u47 | Capacitor_SMD:C_0402_1005Metric | C17, C22 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R19, R23 |
| 2 | 1k2 | Resistor_SMD:R_0402_1005Metric | R1, R4 |
| 2 | 1n | Capacitor_SMD:C_0402_1005Metric | C13, C25 |
| 2 | 22 | Capacitor_SMD:C_0402_1005Metric | C28, C30 |
| 2 | 2u2 | Capacitor_SMD:C_0402_1005Metric | C15, C26 |
| 2 | 330u | Capacitor_SMD:C_0402_1005Metric | C7, C8 |
| 2 | 69k8 | Resistor_SMD:R_0402_1005Metric | R8, R9 |
| 2 | D | Diode_SMD:D_0402_1005Metric | D1, D2 |
| 2 | D_Bridge_+-AA | Diode_SMD:Diode_Bridge_Diotec_ABS | D4, D5 |
| 2 | Ferrite_Bead_Small | Resistor_SMD:R_1206_3216Metric | FB1, FB2 |
| 2 | TCMT1107 | Package_SO:SOP-4_4.4x2.6mm_P1.27mm | U2, U3 |
| 2 | TestPoint | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | 12V1, GND1 |
| 1 | 0R18 | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 0u33 | Capacitor_SMD:C_0402_1005Metric | C34 |
| 1 | 0u33 | Inductor_SMD:L_0402_1005Metric | L2 |
| 1 | 100 | Resistor_SMD:R_0402_1005Metric | R22 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 115k | Resistor_SMD:R_0402_1005Metric | R20 |
| 1 | 13k3 | Resistor_SMD:R_0402_1005Metric | R21 |
| 1 | 141u | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 1n2 | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | 22k1 | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 22u | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 24k9 | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 2k | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | 330p | Capacitor_SMD:C_0402_1005Metric | C23 |
| 1 | 39K | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 3n3 | Capacitor_SMD:C_0402_1005Metric | C24 |
| 1 | 3u3 | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | 47u | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | 49R9 | Resistor_SMD:R_0402_1005Metric | R25 |
| 1 | 63R4 | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 6k49 | Resistor_SMD:R_0402_1005Metric | R24 |
| 1 | D_Zener | Diode_SMD:D_0402_1005Metric | D3 |
| 1 | EFM32GG11B8xx | common:QFP-64 | U6 |
| 1 | Ferrite_Bead | Inductor_SMD:L_0402_1005Metric | L3 |
| 1 | KSZ8081RND | common:QFN-24 | U4 |
| 1 | L78L33_SO8 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | MMDT3906 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q3 |
| 1 | PT61017PEL | Transformer_SMD:Transformer_Ethernet_Bourns_PT61017PEL | TR1 |
| 1 | PoE_Transformer | common:POE_EP13 | T1 |
| 1 | Pulse_Transformer | common:GDTI_EP7 | T2 |
| 1 | RJ45_LED_Shielded | common:RJHSE-538X | J1 |
| 1 | Si7898DP | Package_SO:PowerPAK_SO-8_Single | Q2 |
| 1 | SiR422DP | Package_SO:PowerPAK_SO-8_Single | Q1 |
| 1 | TL431DBZ | Package_TO_SOT_SMD:SOT-23 | D6 |
| 1 | TPS23754PWPR | common:TSSOP-20 | U1 |
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Questions
How big is the Chassis PCB?
It measures 60.3 × 52.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chassis use?
108 parts, built around the TCMT1107, TPS23754PWPR, MMDT3906 and PT61017PEL. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Chassis KiCad files?
From the crawford/PoE repository on GitHub, at the commit this page was made from: the board is hardware/chassis/chassis.kicad_pcb and its schematic hardware/chassis/chassis.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Chassis design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).