COM-HPC Carrier Layout
Thought for 15 sec
I’ll update Version 5.0 front-view visuals only so the Compute Module is drawn with correct 90 mm × 100 mm proportions and occupies the appropriate larger area. Version 4.0 stays locked.
Worked for 3 mins 46 sec
Thought for 26 sec
Created image.
You can move the component labels off to the side of the PCB
Worked for 4 mins 54 sec
Redone for Tiny Tim Version 5.0 front view.
Changes applied:
- Compute Module is shown much larger with intended 90 mm × 100 mm proportions.
- Carrier board remains 105 mm × 115 mm.
- Labels moved off the PCB as side callouts to reduce clutter.
- Version 4.0 remains locked and unchanged.
Updated file:
Updated Front View
Image
Redo rear and review
Lock Version 5.0
Compare front views
Check label accuracy
Improve compute module fit
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Tiny Tim Version 4.0 PoE Solution — DISCONTINUED
Status
DISCONTINUED / DO NOT IMPLEMENT.
Per user instruction, all PoE design work is stopped. This file is retained only as historical analysis and must not be used as an active design requirement, schematic instruction, or layout instruction.
Active Version 4.0 power direction: use a dedicated high-current non-PoE primary power input. Keep 10GbE as data-only unless the user explicitly reopens PoE design later.
Decision
Superseded. Version 4.0 should not implement a PoE powered-device path.
Former PoE architecture, now discontinued:
Bel / TRP G55-122N-155 MagJack + TI TPS2373-3 PoE PD front end + isolated 48 V to 12 V DC/DC converter
Selected / Recommended Parts
Table
| Function | Recommended Part | Status | Notes |
|---|---|---|---|
| Vertical 10GbE PoE MagJack | Bel / TRP G55-122N-155 | Selected for Version 4.0 | Vertical 1x1 RJ45 MagJack ICM, 10GBASE-T, integrated magnetics, through-hole, LEDs, 60 W 4PPoE, -40°C to +85°C. Exact Flux library part not found; footprint import/create required. |
| PoE PD controller | TI TPS2373-3 | Recommended PoE PD controller | Direct fit for IEEE 802.3bt Type 3 / 60 W PSE-class design. Flux library candidate found as TPS2373-3RGWT: fd5b46ea-d597-4417-b3a8-f5f409135f54; verify TI datasheet and final package before schematic. |
| Alternate PoE PD controller | TI TPS2373-4 | Higher-power/headroom alternate | Type 4-capable part; Flux library candidates found. Use only if the MagJack and thermal/power architecture are upgraded/verified for higher input power. |
| Alternate integrated controller | ADI LT4295 | Alternate vendor option | IEEE 802.3bt PD interface with forward/flyback controller; public data supports up to 71.3 W PDs. |
Why TPS2373-3
- Matches the selected Bel G55-122N-155 60 W 4PPoE MagJack capability.
- TI references TPS2373-3 for IEEE 802.3bt Type 3 / 60 W PSE designs.
- Practical delivered power is lower than 60 W after cable loss and conversion loss; treat approximately 51 W at the PD input as the planning limit before DC/DC efficiency losses.
- For a 12 V rail at 90% DC/DC efficiency, approximate available 12 V output power is about 45 W, or ~3.75 A at 12 V.
Power Budget Implication
PoE should be treated as optional/supplemental or conditional main input until the full carrier power budget is known.
Reason: Tiny Tim includes a COM-HPC Mini type module, 10GbE, USB/TBT, HDMI, CSI, GMSL, rear M.2 modules, and auxiliary connectors. The final load may exceed a 45 W-class isolated 12 V PoE output.
Do not size fuses, regulators, ideal diodes, or DC/DC stages until the full load budget is completed.
Proposed Power Architecture
Diagram
Required Follow-Up Before Schematic Capture
- Complete a real power budget for the COM-HPC Mini module and all external/peripheral loads.
- Decide whether PoE is intended as:
- primary board input,
- backup/redundant input,
- or limited-power/service-mode input.
- Select the isolated DC/DC topology and output voltage, likely 12 V intermediate unless module power requirements dictate otherwise.
- Define power OR-ing with existing 5V IN, BAT IN, and BAT OUT paths.
- Verify thermal dissipation and board area for magnetics, PD controller, transformer, MOSFETs, rectifier, input protection, and EMI filtering.
- Confirm whether one or both 10GbE RJ45 ports should support PoE PD input. Default recommendation: one PoE PD input port unless dual-redundant PoE is explicitly required.
Current Recommendation
Do not implement PoE. Keep both 10GbE ports data-only unless the user explicitly reopens PoE design later.
Status
Decision
Selected / Recommended Parts
Why TPS2373-3
Power Budget Implication
Proposed Power Architecture
Required Follow-Up Before Schematic Capture
Current Recommendation
