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Recent content by rohithkrishnan

  1. R

    adapter-12v/60w Design Issues

    Hi , Please check if snubber design is correct. Please share waveform of VDS. Which transformer is used?
  2. R

    running Aleegro 17.2

    That is antipad. Thanks
  3. R

    EMI design for ACDC power supply

    How to design a EMI filter for an ACDC power supply? I don't want any ready made filter. How do I know if a filter is enough or do i need to a change?(I don't have any now) Thanks
  4. R

    SMPS topologies limitations

    Hi, In the below link each topology has the power and current limitation. https://www.smps.us/topologies.html What makes this limitation? Why can't we produce an smps with 150W and current higher than 10A with flyback topology? thanks
  5. R

    Inductors in mains AC filter module?

    L2 and L3 inductors suppress differential mode noise and L1 suppresses common mode noise.
  6. R

    Pic24 to lora communication using uart

    https://ww1.microchip.com/downloads/en/DeviceDoc/LoRa%20Mote%20Users%20Guide.pdf Page 18 Please find the libraries in **broken link removed** https://www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en589115
  7. R

    Fuse selection in flyback converter

    Sorry i dont know much about the making flyback transformer.
  8. R

    Filtering USB input.

    Check the Switching frequency and ripple frequency caused by TPS82084. You should use a filtering of atleast 10times switching frequency. You can also use a TVS in case of a surge appear(ESD).The Raspberry Pi uses a SMBJ5.0A device to suppress transients. You may need to put the ferrite bead to...
  9. R

    Fuse selection in flyback converter

    HI, Short circuit /overcurrent implementation can be done by adding a sense resistor at the source of mosfet and setting the maximum peak current of the transformer. Always choose the current protection 75% of the saturation current of transformer. This also works with short circuit. How are...
  10. R

    Fuse selection in flyback converter

    Fast blow: because in case of spikes appear at input it should not damage the converter. https://www.doityourself.com/stry/slow-blow-fuse-vs-fast-blow-fuse
  11. R

    Fuse selection in flyback converter

    Hi, Is the 1A for 90VAC? If yes you can use 2A fuse or above (Current is maximum drawn at 90Vac). thanks
  12. R

    How to add Logo , date and sheet no in documentation symbol in CADSTAR V8

    Thanks that was helpful. But when i load the dxf the cad star is completely laging. Regards
  13. R

    Questions regarding flyback arrangement. help Needed

    Hi, Schematics 2 a diode is placed inorder to avoid the negative spikes on the base of transistor. how does the diode between collector and gnd act as a snubber? you need to provide a diode between collector(anode of diode ) and red dot of transformer (cathode)...
  14. R

    How to add Logo , date and sheet no in documentation symbol in CADSTAR V8

    Hi, First of all what is documentation symbol? As per my understanding its a format for schematics sheet. Now for a documentation sheet how to add Logo, date and sheet no. in CADSTAR V8 and how can I make rectangle with my dimension. Shape properties shows the following "attachment" Thanks
  15. R

    Questions regarding flyback arrangement. help Needed

    1. 1/3 means there are 3 coils for transformer 1.primary 2. secondary 3.auxiliary. 2. https://www.digikey.com/en/articles/techzone/2014/aug/resistor-capacitor-rc-snubber-design-for-power-switches?WT.srch=1 please find the design in above link. Now when the transistor turn off the the...

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