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  1. Replies
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    Closed: Re: Vin 18V-32V Vout 24V-what can I use?

    It will be 50mA

    How could I combine then?.
  2. Replies
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    Closed: Re: Vin 18V-32V Vout 24V-what can I use?

    Thanks to everyone!

    - - - Updated - - -

    There is nothing bit simpler?
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    383

    Closed: Re: Radiated susceptibility problem-PWM dimming

    No, the PWM is not control feedbacked....
  4. Replies
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    Closed: Vin 18V-32V Vout 24V-what can I use?

    Hi All,

    I need to get a steady voltage of 24V but the Vin can change between 18V and 32V- What could I use?
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    Closed: Re: Radiated susceptibility problem-PWM dimming

    We know the PWM signal is clean when it is at normal conditions, unfortunately we can not test it inside the room where the susceptibility test is carried out.

    I am thinking to get something like...
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    Closed: Re: Best way to shield already fitted cable

    The PWM frequency is 1Khz and yes there long cables leading to a terminal connector which is at the input stage of the lamp.

    Unfortunately it is not possible to measure the flickering frequency...
  7. Replies
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    Closed: Re: Best way to shield already fitted cable

    It is a susceptibility test and the product starts to be affected by the RF at 80Mhz and 300Mhz.We are not sure but we think the cables inside the luminaire are being affected by the RF, though the...
  8. Replies
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    Closed: Best way to shield already fitted cable

    Hi all,

    I need something that I can use to shield a cable that seems to be affected by EMC noise. The cables are already fitted so I would need something that can cover the whole length of the...
  9. Replies
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    Closed: Re: Radiated susceptibility problem-PWM dimming

    Sorry Klaus I know an schematic helps to understand but I cant for commercial reasons....

    The opto was incuded to isolate the PWM from he driver side as it was creating problems in the driver,...
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    Closed: Re: Radiated susceptibility problem-PWM dimming

    I forgot to say it has already got a ferrite clamp, it helped to pass radiated immunity.

    I can't post set up of the test bench but I can explain a bit how it is.

    The unit is on a side of a...
  11. Replies
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    383

    Closed: Radiated susceptibility problem-PWM dimming

    Hi all,

    I have a product which is failing in radiated susceptibility. It is a lamp which is dimmable by a PWM input. When the test is done the flickering is noticeable. I have already shorten...
  12. Closed: Re: Gas Discharge tube-when power up spikes comes out.

    Do you mean that GDTs in general are not suited for mains? or these type specifically are not suited for main applications. If there are some GDT that are suitable could you please point them out?....
  13. Closed: Re: Gas Discharge tube-when power up spikes comes out.

    The GDT has three terminal, it is at the very front of the input voltage. The central pin is connected to earth, the two remaining pins to the Live and Neutral. It is rated 430V, so it shouldn't be...
  14. Closed: Re: Gas Discharge tube-when power up spikes comes out.

    It is intended to be installed in high humidity environments....

    I don't follow you with "arc V >> Gas Avalanche V", I though the arc is how it discharges the energy so the arc voltage should be...
  15. Closed: Re: Gas Discharge tube-when power up spikes comes out.

    Thanks for your answers!.

    The gas discharge tube is at the very front of a line filter and it is next to a common mode choke so any spike voltage theoretically should be mitigated by the common...
  16. Closed: Gas Discharge tube-when power up spikes comes out.

    Hi All,

    I am doing a design using a Gas discharge tube. The Gas discharge tube is the next one:
    ...
  17. Replies
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    Closed: Re: Sustitute LED by resistor ( or anything else)

    The maximum current will be 350mA. The total voltage is up to me really. There is a couple of equation in the data sheet of the LED driver to set the Ton and Toff. The recommendation is to have a...
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    Closed: Re: Sustitute LED by resistor ( or anything else)

    ehehheh, it is true, and it is very simple as LEDs are diode....I understand now you moved this thread to elementary questions, thanks!!
  19. Replies
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    Closed: Sustitute LED by resistor ( or anything else)

    Hi All,

    I am designing a board with a LED driver ( ZLED7730) and I am having a problem. Most of the LED that I could buy are very expensive and I don't have a reflow machine at home to solder them...
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    Closed: Re: Output current op amp-LTspirce simulation

    I think I was missing that the voltage in the graphs is always voltage referenced to the positive or negative rail. It makes sense now, thanks.
  21. Replies
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    Closed: Re: Output current op amp-LTspirce simulation

    Hi All,

    I have got these Op amp as an example: TLV271 type D ( SOIC package).

    https://www.ti.com/lit/ds/symlink/tlv272.pdf

    The maximum Tj is 150°C and we can suppose an ambient temperature...
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    Closed: Re: Output current op amp-LTspirce simulation

    I am sorry but I am a bit confused. Is it possible to burn an op amp by outputting too much current or voltage?. If we short the output of an op amp what would happen?, would it run current until it...
  23. Replies
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    Closed: Re: Output current op amp-LTspirce simulation

    The supply voltage for the op amp will be +/- 15V and the voltage that I need to output to achieve 22.4mA is 1.87V.
  24. Replies
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    Closed: Re: Output current op amp-LTspirce simulation

    Hi Crutschow,

    I have changed he circuit and I just need 1.87V at the op amp output to generated a current of 22.4mA. I am going now to use this op amp (TLV4171) which is a bit cheaper as I...
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    Closed: Re: Output current op amp-LTspirce simulation

    Hi All,

    The current in the load is 22.4mA. I have chosen this op amp that I think it will do the job.

    LM258ADT
    ...
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