Power Architecture Review

take a look at all these components I want to make sure that the RP240 doesn't back power the buck converter and that the power switches to buck converter power when I power through this connector. is the current architecture correct? make a design doc outlining this problem.

flux

0:11

Thought for 5 sec

Thought for a moment

I’ll audit the existing power architecture around the RP2040 Zero, buck converter, and connector power path, then write a project file documenting whether back-powering is prevented and what changes are needed.

flux

4:49

Thought for 2 sec

Created 4 tasks.

1/4 Inspect schematic nets and components around RP2040 Zero, buck converter, connector power input, and power-switching devices

Thought for 2 sec

Completed design checks — found 36 issues.

Read schematic.

Thought for 4 sec

2/4 Check relevant datasheet details for buck converter and RP2040 Zero power behavior

Thought for 5 sec

Read U2 datasheet for LMR14030 EN pin behavior input voltage s.

Read U1 datasheet for RP2040-ZERO module 5V pin 3V3 pin USB po.

Read Q1 datasheet for QM6015D P channel MOSFET pinout body dio.

Read schematic.

Read "[Datasheet for QM6015D] QM6015D P channel MOSFET pinout body diode direction maximum VGS recommended reverse polarity protection orientation" in QM6015D.pdf.

Read QM6015D.pdf.

Thought for 5 sec

Read U3 datasheet for MP6513 VCC supply operating voltage inpu.

Found 10 results for RP2040-Zero WaveShare schematic 5V pin USB diode back power external 5V.

Read schematic.

Thought for 3 sec

Read waveshare.com.

Thought for 16 sec

3/4 Determine whether the existing architecture prevents back-powering and auto-selects buck power correctly

Read 11 knowledge entries.

Thought for 13 sec

Thought for 5 sec

4/4 Create/update a project file documenting the issue, findings, and recommended architecture

Thought for 45 sec

Thought for 3 sec

4/4 tasks completed.

Thought for a moment

I reviewed the power architecture and created Power Backfeed Architecture Review.

Verdict: the current architecture is not correct for preventing RP2040 Zero USB/5 V back-power into the buck output network. The V5 buck output is directly tied to U1:5V, and the RP2040 Zero’s 5 V/VUSB/VSYS node is directly connected internally, so the fix should split V5 into buck-side and RP2040-side rails with a Schottky/ideal-diode power path; I also flagged Q1 source/drain orientation and C11’s likely net/role mismatch.

Recommend ideal diode

Check Q1 orientation

Run ERC/DRC

Propose rail names

Add wiring table

Here is a youtube video on how to manufacture the PCB: https://www.youtube.com/w...

ryanf

Here is a youtube video on how to manufacture the PCB:

11d

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Reviews

Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
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RMCF0805JT47K0
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700.5k

Project Name

Description

Compact RP2040 Zero motor controller with protected 28 V input, 3.3 V reversible motor H-bridge output, USB programming, active-high trigger input, and 3.5 mm screw terminals.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$2.59–$3.38
Digi-Key	$2.34–$2.80
HQonline	$0.90
LCSC	$1.27
Mouser	$7.94
TME	$8.49
Verical	$3.68–$5.05

Controls

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