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  1. M

    Trace width calculation for metal clad PCBs

    Yes, I did try Saturn PCB calculator. In fact that was the first thing I tried. Saturn PCB Toolkit does not offer any specific method to calculate trace current for metal clad PCBs.
  2. M

    Trace width calculation for metal clad PCBs

    Is there a standard/calculator available to calculate trace width for designing metal clad PCBs? Many calculators available online can only calculate trace width for FR4 PCBs based on the IPC standard. I understand that due to better thermal performance of metal clad PCB, the temperature rise of...
  3. M

    RMS current through a switched inductor

    I am worried about whether I am providing enough heatsink for the FET or not. Unless I know the exact power, I cannot be sure of that. The inductor is 4.5mH with 4 ohms of resistance. The frequency is 300Hz with a duty cycle varying from 50% to 90%.
  4. M

    RMS current through a switched inductor

    Hi, I am trying to calculate the RMS current through a MOSFET for the sake of calculating its power dissipation. The MOSFET is acting as a low side driver with an inductive load. Now most of the app notes and articles out there model the inductor current as ramp for calculations. This is ok for...
  5. M

    PCB Core Laminate Thickness

    Hi, I am designing a PCB for which I have to mention the stack up and do some impedance calculations. I have a basic question. When I say that I have a core with a thickness of 200 um, does this 200 um include the thickness of copper as well? I mean if i am using 35 um copper, is the cross...
  6. M

    Why Plated PCB Mounting Holes?

    There are three ground planes. One analog ground, one digital ground and one power ground which are ultimately connected as a star connection. They do not overlap with each other.
  7. M

    Why Plated PCB Mounting Holes?

    If I have multiple ground planes on my board, which ground plane should the mounting hole be connected to?
  8. M

    Why Plated PCB Mounting Holes?

    Do you have any idea how it is done in case of a battery operated system, where there is no earth? Like an automotive system?
  9. M

    Why Plated PCB Mounting Holes?

    Hi, I am designing a PCB which will be housed in a metal enclosure. Is it advisable to have plated PCB mounting holes and connect them to ground plane? I have seen some PCBs where the plated mounting hole is connected to the ground plane through an RC network. What's the reason behind this...
  10. M

    Why do automotive led drivers only have 5V fet gate drive outputs?

    I believe that has got something to do with the automotive EMC standards. The way they define performance criteria for the ECUs especially for functions like headlamps, DRL etc. does make it mandatory that the lamp should remain ON even during disturbance. Agreed. But voltages less than 10V...
  11. M

    Why do automotive led drivers only have 5V fet gate drive outputs?

    Not a direct answer to your question, but as per my understanding LED drivers are mostly boost converters which use NMOS. Even Infineon recommends using 5V gate voltage compatible MOSFETs in their application notes. Also, during worst case cold cranking the input voltage can go as low as 4.5V...
  12. M

    MCU pin driving 74HC fanout

    Thanks FvM. For that matter, how much of capacitive load can any regular MCU pin drive? I mean, after how much load should I start thinking of buffers?
  13. M

    MCU pin driving 74HC fanout

    Hi, I am using my MCU to drive select lines of ten 74HC series multiplexers connected in parallel. Each select line presents a maximum capacitance of 10pF as per the datasheet. Which means the MCU pin has to switch a maximum of 100pF. The select lines switch approximately every 250us. In this...
  14. M

    Circuit Copyright: How does it work?

    This means unless the circuit has patented blocks, any product as such cannot be copyrighted. In this case, if I have to copyright my product, how can I do it?
  15. M

    Circuit Copyright: How does it work?

    Hi, If I am designing a new product and want to copyright the circuit, what is the scope of that copyright? Does it include the 'design' part of the circuit or is it just the 'schematic' or 'drawing'? If the copyright holds only for drawing, what are the ways in which I can protect my 'design'?
  16. M

    About j1939 protocol of CAN bus communication

    For details of diagnostics, please refer to SAE J1939-73 standard. Actually, there are a lot of short presentations and help articles on the web which explain the basics of J1939. Some of them can be found here and here.
  17. M

    About j1939 protocol of CAN bus communication

    For a complete list of SPNs, please see if you can lay your hands on a copy of SAE J1939-71 standard. I don't think the full list is available anywhere else.
  18. M

    Alternative for relays

    Semiconductor switches like MOSFETS can be one alternative. However, semiconductor switches dissipate power in the form of heat (due to the channel resistance), which you need to take care of. If you are looking for some diagnostics too, semiconductor switches is a much more suitable option...
  19. M

    Calculating Back EMF of a Solenoid Coil

    I had explored this approach initially. But my loads currents are upwards of 2A, which would cause excessive power dissipation in the resistor across the solenoid. Also, I am using a smart switch. Hence I am equally interested, if not more, in protecting the avalanche clamp inside the switch...
  20. M

    Calculating Back EMF of a Solenoid Coil

    Hi Tunelabguy, as you said, I need the back emf to decay as quickly as possible. Also, the application needs to sustain reverse polarity of supply voltage for certain time duration. Agreed, that my driver MOSFET too will turn on with reverse polarity supply. But the current will be limited by...

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