• Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
  • Ground
    A common return path for electric current. Commonly known as ground.
  • Net Portal
    A net identifier used to create connectivity to other Net Portal with the same designator. #portal
  • Power Net Portal
    Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
  • Generic Resistor
    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 #CommonPartsLibrary
  • Generic Capacitor
    A generic fixed capacitor 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 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 #CommonPartsLibrary
  • Generic Inductor
    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 #generics
  • RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
  • 875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
  • CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
how do I use Flux?

@copilot how do I use Flux?
2mo
To get started with Flux, follow these steps:
  1. Sign Up for an Account: Visit Flux.ai and create an account to start using the platform.
  2. Explore the Workspace: Once you log in, explore the workspace which includes a schematic editor for designing circuits and a PCB layout editor for arranging components.
  3. Import Projects: If you have existing projects from other platforms like KiCad or EasyEDA, you can follow migration tutorials to bring those projects into Flux.
  4. Place Components: Use the library to drag and drop components onto your schematic canvas. Search for parts by name or number.
  5. Connect Components: Create connections by drawing wires between component pins in the schematic editor.
  6. Simulation: Use the simulator to test your designs. Check out the relevant tutorial for using the simulator.
  7. Generate PCB Layouts: Switch to the PCB layout view to arrange your components and create the physical board layout.
  8. Export and Share: Once your design is complete, export the files as needed for manufacturing or share with collaborators.
For a detailed overview and more advanced features, consult the full Flux documentation. If you have any specific questions or need help with your projects, feel free to ask!
2mo
Someone is typing...
list all U1 pins in a table format. For each pin provide its pin number, pin nam...

@copilot list all U1 pins in a table format. For each pin provide its pin number, pin name and function.
2mo
Certainly! Here's a table listing all the pins for the LM2596DSADJR4G IC (U1), along with their pin numbers, names, and functions:

Table


Pin NumberPin NameFunction
1VINPositive input supply for the LM2596 step-down switching regulator.
2OUTOutput pin for the step-down voltage.
3GNDCircuit ground pin.
4FBFeedback pin for connecting the resistor network to program the output voltage.
5ON/OFFAllows the regulator to be shut down using logic level signals (threshold 1.6 V).
6EPADExposed pad, usually connected to ground for heat dissipation and electrical connectivity.
Let me know if you need additional information or further assistance!
2mo
is U1 same as linear regulator?
2mo
No, the LM2596 is not a linear regulator. It is a buck converter, which is a type of DC-DC switching regulator.
Here's a comparison between the two:
  • Linear Regulators:
    • Operate by converting excess voltage into heat, making them less efficient, especially with large differences between input and output voltages.
    • Simpler design with fewer components.
    • Provide very low output noise and ripple.
    • Suitable for low-power applications where efficiency is less critical.
  • Buck Converters (Switching Regulators), like LM2596:
    • Use a switch (typically a transistor) to control the energy transfer from the input to the output, which makes them more efficient than linear regulators.
    • Can handle larger input-output voltage differences with higher efficiency.
    • Require additional components like inductors and diodes.
    • Provide higher output ripple compared to linear regulators but are suitable for applications where power efficiency is important.
If you have specific requirements or further questions about the LM2596, feel free to ask!
2mo
Someone is typing...
6
how do I use Flux?

@copilot how do I use Flux?
2mo
To get started with Flux, you can follow these general steps:
  1. Create a Flux Account: Sign up for an account on Flux.ai.
  2. Migrate Projects: If you have existing projects in tools like EasyEDA or KiCad, you can follow the migration tutorials to bring them into Flux. Here are links to the tutorials for
    [1] and
    [2].
  3. Learn the Features: To get a comprehensive look at Flux’s features and how to integrate them into your workflow, check out the full documentation[3].
  4. Using the Simulator: To learn how to use the simulator within Flux, you can refer to the available tutorials[4].
  5. Hands-On Practice: Start by creating a new project and experimenting with the schematic and PCB layout tools. Add components from the library, connect them, and simulate your designs.
  6. Community and Resources: Engage with community resources, participate in discussions, and stay updated with Flux's news and updates.
Is there a specific aspect of using Flux you want to dive deeper into? Let me know!
2mo
Someone is typing...
4
how do I use Flux?

@copilot how do I use Flux?
1mo
To get started with Flux and bring your electronic design ideas to life, you can follow these steps:
  1. Sign Up: Create an account on Flux[1].
  2. Explore: Once you're in, explore the interface and familiarize yourself with the tools available. Flux provides a variety of components and features to aid in your design process.
  3. Create Schematics: Begin by placing components from the library onto the canvas and connecting them to form your schematic. The components can be dragged and dropped easily[2].
  4. Design PCB Layouts: After completing your schematic, you can move to PCB layout design. Arrange your components and design the pathways for your circuit.
  5. Simulate: Use the simulation features to test your circuit electronically and ensure it behaves as expected[3].
  6. Use Copilot: If you're ever unsure about a feature or need assistance, you can ask Copilot for guidance and even act on specific connection suggestions directly[4].
  7. Access Documentation: For a comprehensive look at Flux’s features and how to integrate them into your workflow, check out the full documentation available on their website[2].
If you're transitioning from other CAD tools like EasyEDA or KiCad, there are specific migration tutorials available to help you move your projects to Flux[5][6].
Feel free to ask if you have more questions or need help with specific tasks!
1mo
Someone is typing...
7
L1
Inductance
33u H
D1
VOUT
+5V
R2
Resistance
1k Ω
+5V
+5V
C3
Capacitance
470u F
U1
R1
Resistance
3.0k Ω
C1
Capacitance
1.2n F
2
Why is this here and what does it do

@copilot Why is this here and what does it do
3mo
It looks like you're working on a project involving a DC-DC Buck converter based on the LM2596 IC. Allow me to break down how this works and what its purpose is:
Purpose of the Project:
  • Voltage Step-Down: The primary function of this buck converter is to step down an input voltage of 12V to a regulated output of 5V. It's useful for applications where you need a stable 5V power supply.
Key Components and Their Roles:
  • LM2596 IC: This integrated circuit is the heart of the buck converter. It regulates the output voltage to 5V.
  • Inductor L1L1 (33uH): This component stores energy in a magnetic field when current flows through it. In a buck converter, it helps smooth the output current, reducing voltage ripples.
  • Schottky Diode D1D1: This provides a path for current when the switch inside the LM2596 turns off. Its fast switching and low forward voltage drop are suitable for high-frequency applications.
  • Capacitors (C1C1, C2C2, C3C3): These components filter the input and output voltages, reducing fluctuations and stabilizing the voltage.
  • Resistors (R1R1, R2R2): They set the voltage feedback to the LM2596, determining the output voltage.
  • Connectors (VINVIN, VOUTVOUT): These provide connection ports for input power and output voltage.
What it Does:
In operation, the circuit takes a 12V input and goes through a switching process controlled by the LM2596. The output voltage is continuously adjusted by feedback from the resistors, ensuring it remains stable at 5V. The inductor and capacitors work together to reduce ripple and noise.
If you have any specific questions or need explanations about particular connections or components, feel free to ask!
3mo
The question is why is there a test point on the ON/OFF pin?
3mo
The test point on the ON/OFF pin of the LM2596 serves a couple of purposes:
Reasons for the Test Point on the ON/OFF Pin:
  1. Debugging and Testing:
    • The test point provides easy access to the ON/OFF pin for debugging during development and testing. You can easily measure or apply a logic level to this pin to test the converter's response without making intrusive connections or modifications to the board.
  2. Controlled Operation:
    • The ON/OFF pin allows you to enable or disable the converter, potentially useful during testing. By accessing this pin through the test point, you can simulate power-on and power-off conditions easily or automate these states in testing environments.
  3. External Control Interface:
    • If you connect the test point to an external circuit or microcontroller, it can be used to enable or disable the converter remotely, based on certain conditions or stimuli.
Functional Role:
In the LM2596, the ON/OFF pin is used to turn the regulator on or off. By grounding the pin, the regulator is turned off, and by floating it—that is, leaving it unconnected or connecting it to a high logic level—the regulator is turned on. This test point can therefore serve numerous purposes, including diagnosis and integration into a larger system or application.
If you'd like more information on how to leverage this pin or set up specific tests, feel free to ask!
3mo
Someone is typing...
5
Can I safely use a 47uH inductor instead of this 33uH?

@copilot Can I safely use a 47uH inductor instead of this 33uH?
2mo
Using a 47µH inductor instead of a 33µH inductor in your LM2596 buck converter circuit may have implications on the performance characteristics of the converter. Here are some considerations:
  • Inductor Value Impact: The inductor value in a buck converter influences the ripple current and the converter’s transient response. Using a higher inductance like 47µH will generally reduce the ripple current, but it might slow down the transient response. This might not be a problem depending on the specifics of your application.
  • Frequency: The LM2596 operates at a switching frequency of about 150 kHz. Using a different inductor value will influence how the converter reacts to this frequency but should still work as long as all other parameters are within acceptable ranges.
  • Current Rating: Ensure that the 47µH inductor can handle the peak currents of your circuit without saturating. This is crucial to avoid performance issues or damage to the inductor.
  • Output Ripple: The change in inductance will affect the ripple voltage on the output. If you need tight regulation and low ripple, you might want to verify if the system still meets your requirements with the new inductor value.
It's a good idea to simulate the circuit with the new inductor value or test it on a prototype to ensure it meets your design requirements. Let me know if you need help with any specific calculations or simulations!
2mo
Someone is typing...

LM2596 Buck converter 5V

LM2596 Buck converter 5V
Description

Created
Last updated by vasy_skral
1 Contributor(s)
vasy_skral

Controls

Properties

Availability & Pricing

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

Assets

Simulation

µs

Simulation Speed

Schematic Analysis and Corrections

Analyze this schematic for potential design issues. Identify electrical, logical, or connectivity flaws, including incorrect net connections, missing or misplaced components, incorrect pin assignments, power distribution issues, and potential signal integrity concerns. Check for compliance with best practices such as proper decoupling capacitor placement, pull-up/pull-down resistor usage, current limiting resistors, and correct net labeling. Provide a direct schematic-level analysis—do not generate hypothetical examples. Focus solely on identifying real issues in the provided schematic and suggest specific corrections or optimizations.
Analyze this schematic for potential design issues. Identify electrical, logical, or connectivity flaws, including incorrect net connections, missing or misplaced components, incorrect pin assignments, power distribution issues, and potential signal integrity concerns. Check for compliance with best practices such as proper decoupling capacitor placement, pull-up/pull-down resistor usage, current limiting resistors, and correct net labeling. Provide a direct schematic-level analysis—do not generate hypothetical examples. Focus solely on identifying real issues in the provided schematic and suggest specific corrections or optimizations.

Using

General
Chat History
Project PCB Layout
Below is a schematic-level analysis based on the actual connections found in your LM2596 buck converter design:
  1. Feedback Network (FB Divider Issues):
    • The voltage divider (using resistors [R1] at 3.0 kΩ and [R2] at 1 kΩ) connects between the output and ground with its junction feeding the FB pin of the regulator. A capacitor ([C1]) is connected between the output (which has the bulk voltage) and the FB node.
    • Issue: Using a capacitor bridging the output and the divider junction instead of grounding the feedback node can alter the divider’s effective ratio and potentially slow the regulator’s transient response.
    • Correction: Remove or reposition [C1] from between the output and FB. If low-pass filtering of the FB node is needed, add a dedicated capacitor from the FB node directly to ground as specified in the LM2596 datasheet.
  2. Input Decoupling and Bypass:
    • The schematic includes a 100 µF electrolytic capacitor ([C2]) between the 12 V supply and ground for bulk decoupling at VIN.
    • Issue: Switching regulators like the LM2596 typically require a small-value (≈100 nF) ceramic capacitor located as near as possible to the VIN pin to filter high‑frequency noise.
    • Correction: Add a 100 nF capacitor very close to U1’s VIN pin in addition to the bulk capacitor to ensure proper high‑frequency decoupling.
  3. Output Stage Layout (Inductor and Output Capacitor):
    • The output filter is implemented with an inductor ([L1]) followed by a 470 µF output capacitor ([C3]).
    • Issue: For optimal performance, these components must be placed very close to the regulator’s output pin and inductor junction to minimize loop area. Long interconnects can introduce voltage spikes, noise, and reduced regulation performance.
    • Correction: In your PCB layout, confirm that [L1] and [C3] are as near to U1’s OUT pin as possible, with short, wide traces to keep parasitic inductance and resistance low.
  4. Diode Orientation and Characteristics:
    • The Schottky diode ([D1]) is used to provide a freewheeling path during switching. It is connected with its cathode to the switching node and its anode to ground.
    • Issue: While the diode’s orientation appears correct, it is critical to verify that its forward drop and reverse recovery meet the regulator’s requirements. An inappropriate diode could degrade efficiency or cause excess voltage overshoot.
    • Correction: Double‑check the diode’s datasheet (available in your schematic) against the LM2596 recommendations, ensuring it is rated for the necessary current and speed.
  5. Net Labeling and Connectivity:
    • The schematic uses clear net labels (e.g., “Net 1,” “Net 3,” “GND”) for the various power and signal paths. The divider is split across “Net 3” (output), “Net 4” (feedback junction), and “GND.”
    • Issue: Although the connectivity is consistent, naming the nets with descriptive labels (such as “+12V_IN,” “+5V_OUT,” and “FB_VOLT”) can help avoid misinterpretation during PCB layout.
    • Correction: Consider renaming key nets for clarity, which can be especially helpful during layout and in future design reviews.
  6. PCB Layout Considerations (Signal Integrity):
    • The feedback trace from the divider to the FB pin is critical. Large loop areas or traces routed near high‑frequency switching nodes can introduce undesired noise pickup.
    • Issue: If the feedback trace is long or routed alongside the high‑dV/dt switching path from the regulator’s output, it can affect the stability and transient response of the regulator.
    • Correction: In the PCB layout, ensure the feedback connection is kept as short as possible and is routed away from the switching node and other noisy traces. Pay special attention to using a continuous ground reference to minimize induced noise.
Summary of Specific Corrections/Optimizations:
  • Feedback Network: Remove or reposition [C1] so that the FB node is not loaded by a capacitor bridging it to the high‑voltage output. If filtering is desired, add a capacitor from the FB node directly to ground.
  • Input Bypass: Add a 100 nF ceramic capacitor at U1’s VIN pin near the regulator to complement the existing 100 µF bulk capacitor.
  • Layout Proximity: Verify that the output filter components ([L1] and [C3]) are placed with minimal PCB trace length from the regulator’s output to reduce parasitics.
  • Diode Verification: Confirm that [D1] meets the performance requirements (low forward drop, fast recovery) as per the LM2596 datasheet.
  • Net Labeling: Consider renaming key nets (e.g., “+12V_IN”, “+5V_OUT”, “FB_VOLT”) for improved clarity during PCB layout review.
  • Routing: Keep the feedback wiring short and isolated from high‑frequency switching traces to avoid signal integrity issues.
Implementing these corrections will improve regulation accuracy, noise immunity, and overall converter performance.
Feedback Network Correction
Input Decoupling Additions
Output and Diode Adjustments
I want to create a buck converter that can take an input of 7,2 V and out 5 V (stable) and 5 A (max). This is suppose to power my raspberry pi

Checks that the power traveling across a given resistor is under its rating with 50% headroom.
Learn more
Checks that IC pins that require pull up or pull down resistors have them.
Learn more
Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.
Checks that all parts have a part number and are available from distributors.
Reports issues with Auto-Layout if Copilot cannot route something or must ignore a configuration.
Reports copper elements that are shorting.
Reports parts that have no footprint.
Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.
Reports terminals that are not connected properly. NOTE: Only connections to the center of pads are considered valid.
Reports nodes that are using rules that are not supported anymore.
Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.
Detect any via, trace or copper fill island that is not connected to any net.