Raspberry Pi HAT Design Overview

where you have conbcet on/off pin?

Thought for 12 sec

I don’t see any uploaded-file evidence showing that the LM2596 ON/OFF pin is already connected somewhere in your design. The file search results returned only general guidance files, not a schematic snippet or net listing for that pin, so I can’t point to an existing connection from the uploaded material

So the direct answer is:

If you’re asking “where should I connect it?” → connect ON/OFF to the power-side ground so the regulator stays enabled.
If you’re asking “where did you connect it in the design?” → I did not verify an actual placed connection from the uploaded files; there isn’t enough file evidence to claim it is already wired anywhere

For your board, that means:

LM2596 ON/OFF -> Power_GND
Keep it on the buck / 24 V side
Do not connect it to the isolated Pi ground plane
Do not leave it floating

If you want, I can next help you identify the exact LM2596 pin number for ON/OFF from the datasheet and give you the full pin-by-pin connection map.

Pin map please

Check datasheet pin

Review ground domains

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@copilot how do I use Flux?

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Inductance

33uH

VOUT

+5V

Resistance

1kΩ

+5V

Capacitance

470uF

Resistance

3.0kΩ

Capacitance

1.2nF

Reviews

Generic Inductor
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16.2k
Generic Capacitor
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, 10000uF 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, 220pF, 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 #CommonPartsLibrary
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1.5M
Generic Resistor
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700.5k

Project Name

LM2596 Buck converter 5V

Description

This project is a DC-DC Buck converter based on the LM2596 IC. It is designed to step down the input voltage from 12V to a regulated output of 5V #Buck #LM2596 #project

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Digi-Key	$1.89–$3.76
LCSC	$2.96
Mouser	$3.70

Controls

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vasy_skral / LM2596 Buck converter 5V

Schematic