Schematic Review and Fixes
1:41
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U1
Verifying the TPS259531DSGT usage.
Examining TPS259531DSGT features.
Searching web for: "TPS259531DSGT datasheet reverse current blocking TPS259531 features ILIM dvdt pinout"
Found 1 results.
Advising on TPS259531DSGT connections.
Verifying TPS259531 connections.
Short answer
- TPS259531DSGT is an appropriate eFuse for your 6 V input. Use it at J6 input for inrush control, current limit, and fault protection.
- Keep D1 in series unless the TPS259531 variant you have explicitly specifies reverse-polarity tolerance/reverse blocking at IN. Most TPS25953x parts block reverse current OUT->IN but do not survive a reversed adapter on IN without an external diode.
How to wire and use TPS259531 correctly in your design
- Power path
- J6 tip (+6 V) -> U1 (TPS259531) IN
- U1 OUT -> series Schottky [D1] anode
- D1 cathode -> PiVIN (the 6 V rail feeding the buck and the spotlight loads)
- J6 sleeve -> GND
- Control and set pins (check the datasheet’s pin table for exact names)
- ILIM: add a resistor to GND to set the current limit to your target. For Pi ~3 A + motors up to 2 A, set ILIM ≈ 4.5–5.0 A. Use the datasheet’s ILIM vs RILIM equation to choose the resistor.
- dVdt: add a capacitor from dVdt to GND to slow the U1 OUT slew and tame inrush into your bulk and the buck. Pick CdVdt per the datasheet’s rise-time equation; start with a few nF to tens of nF and adjust as needed.
- EN/UVLO: tie EN so the device turns on at your intended VIN; you can use simple enable or add a divider to set UVLO above brownout if desired.
- FLT/PG (if present): optional; leave NC or pull up to a logic rail for fault indication.
- Exposed pad: tie to GND with ample copper for thermal relief.
- Keep D1 unless the datasheet for your exact TPS259531 device states input reverse polarity protection. If it does, you can remove D1 and wire U1 OUT directly to PiVIN.
Everything else looks consistent with your goals
- Pi 5 V path: Buck set to ~5.2 V -> PTC [F2] (sized for your intended Pi draw; use ~3 A hold if you truly need 3 A) -> H1 Pin 1 and Pin 3 (bottom-mounted header). Good.
- Pi-side TVS: SMF6.0A with K on the fused Pi 5 V, A to GND, placed right at the header with a very short ground via. Good.
- Spotlight loads: JST connectors should be wired VIN (6 V) on one pin and the MOSFET drain on the other; gates driven from GPIO via 100 Ω with 100 kΩ pulldowns, flyback diodes to PiVIN. Good.
- Brownout avoidance
- Set U1 ILIM to ~5 A and add dVdt capacitance.
- Use bulk capacitance:
- At PiVIN (6 V): add 47–100 µF (electrolytic or multiple ceramics) near the buck input caps.
- At the fused Pi 5 V after F2: add 47–100 µF low-ESR bulk to help step loads.
- Keep VIN, BUCK_5V, and PI_5V copper wide (see prior guidance: VIN 2.0–3.0 mm trunk, PI_5V 1.5–2.0 mm) and use via arrays at layer changes.
Action checklist to finalize
- Confirm TPS259531’s datasheet for:
- ILIM resistor equation and set RILIM for ~5 A.
- dVdt rise-time equation and choose CdVdt.
- Whether your exact device supports input reverse polarity; if not, keep D1.
- Ensure D1 is a 5 A class Schottky (e.g., MBRS540) and is placed as: U1 OUT -> D1 A, D1 K -> PiVIN.
- Verify F2’s hold current aligns with your Pi current target (≈3 A hold if you truly want up to 3 A).
- Add/confirm bulk caps as above and re-run ERC/DRC.
If you want, tell me your chosen ILIM and I’ll compute a starting RILIM and CdVdt target from the datasheet equations, plus review the U1 pin wiring against your schematic one-to-one.
27 days
Plan completed.
Show Plan
GND (common)
J2
Hole3
GND
J6
J5
GND
GND (common)
D2
GPIO 17
R1
D1
VIN
D6
GPIO 17
GND
Hole4
GND (common)
GND
R2
J1
VIN
GPIO 10
H1
Manufacturer Part Number
2.54-2*20
GPIO 10
GND
J7
D3
VIN
VIN
VIN
R4
U1
R3
Q2
Q1
D5
Reviews
Electrical Rule Checks
Missing Footprints
Reports parts that have no footprint.
Design Rule Checks
Overlapping Copper
Reports copper elements that are shorting.
Invalid Layer
Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.
Component Overrides • 24
Designator | Ruleset | |
|---|---|---|
Airwires
Reports missing routed traces between pads in a net.
Deprecated Rules
Reports nodes that are using rules that are not supported anymore.
Layers with Multiple Fills
Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.
Floating Copper
Detect any via, trace or copper fill island that is not connected to any net.
Protected Intrusions
Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.
System Checks
Auto-Layout
BetaReports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.
Passive Components
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #genericsjharwinbarrozo15.1k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
Inspect
Stuck Cyan Lightcycle
Controls
Properties
Ω
V
V
Ω
Availability & Pricing
| Distributor | Qty 1 | |
|---|---|---|
| Arrow | $2.73–$3.33 | |
| Digi-Key | $2.22–$3.61 | |
| LCSC | $2.78–$3.40 | |
| Mouser | $3.42–$3.76 | |
| TME | $2.74 | |
| Verical | $1.64–$91.56 | |
Assets
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