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Type: Posts; User: mrinalmani

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  1. Closed: Re: Current transformer waveform severe distortion

    I figured out the solution. Thanks everyone, thanks FvM.

    - If the transformer was ideal then with secondary shorted out (0 burden) there would be no magnetizing current and net flux in core would...
  2. Closed: Re: Current transformer waveform severe distortion

    Thanks for the reply.
    But since this is a current transformer, ∫Vdt concept doesn't quite fit here. Or am I missing something?
    The current is already dictated by the primary current. If the core...
  3. Closed: Current transformer waveform severe distortion

    Hi
    I've wound a simple current transformer with 1:100 turn ratio using a small toroidal nanocrystalline core.
    It more or less works OK, but there are two issues.
    1. The current aligns to voltage...
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    Closed: Re: H-Bridge heating without load

    Hi everyone, thanks for the replies
    There is no shoot through for sure, I increased the dead-band to 400ns to make sure about this.
    As just pointed out by @mtwieg and then again by @FvM, the charge...
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    Closed: Re: H-Bridge heating without load

    Thank you for the valuable replies.
    I do not see any cross conduction, there is also no dip in the bus voltage which would insinuate cross-conduction. I have tested with dead-band as wide as 500ns...
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    Closed: H-Bridge heating without load

    Hi
    I am testing an H-Bridge circuit and it is heating up without load.
    The MOSFET is IPD60R180C7 (600V, 180mOhm Infineon MOSFET). Supply voltage is 250VDC and switching frequency is 100KHz. There's...
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    Closed: Inductor for PFC boost application

    Hi
    I am trying to design an inductor for a 300W PFC. It turns out to be a 470uH inductor with greater than 4A saturation current.
    I figured out that iron powder cores along with its derivatives...
  8. Closed: Re: Lattice of plated over thermal vias are too close together in D2PAK footprint?

    The copper plating thickness of through hole via is minimum 25um for 1oz plating. For 0.25mm diameter via, the area covered by copper plating is 20%. Even if solder is filled in the remaining 80%...
  9. Closed: Re: Lattice of plated over thermal vias are too close together in D2PAK footprint?

    Hi!
    I did not quite understand why the vias need to be plated with copper.
    For several years I've used 0.25mm diameter vias with a pitch of 0.5mm. For DPAK (not D2PAK) there are approximately 100...
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    Closed: Input filter for solar charger

    Hi!
    Is an input LC filter required in a buck topology solar MPPT?
    Without an input filter, the very nature of a buck converter would result in discontinuous current being drawn form the solar...
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    Closed: Re: Suggestions for using high value resistor

    Hi!
    Thanks for the quick reply.
    I very much admire the idea of using multiplexers and single opamp at he output of multiplexer. However is it OK to send a weak signal to multiplexer without...
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    Closed: Suggestions for using high value resistor

    Hi!
    I am designing a battery string stabilization circuit with 20 individual Lithium cells in series. The cells combine together give an output of nearly 80V.
    The voltage of each individual cell...
  13. Closed: Re: Understanding feedback requirement of a switcher IC

    Thank you for the reply...
    It makes sense now that the 2mV is the amplifier input signal and not the absolute error.
    However, I'll have to admit that at this point I am totally out of touch with...
  14. Closed: Re: Understanding feedback requirement of a switcher IC

    Thanks for the reply!
    My concern here is that the maximum guaranteed sink capability of the OTA is 2mA and since it has a gain of 1, just 2mV of error will sweep the full range of the available...
  15. Closed: Understanding feedback requirement of a switcher IC

    Hi!
    I am using NCP4371 which is a flyback converter switcher IC that uses a optocoupler for feedback.
    I need to use this IC for buck topology. The error in output voltage and current is indicated...
  16. [SOLVED]Closed: Re: Cell phone battery charging from 12V DC source

    Hi!
    Yes, the problem seems to be solved. I was confused whether "constant current" needs to be implement in the charger or not.
    It appears that the charger needs only to be a "constant voltage"...
  17. [SOLVED]Closed: Re: Cell phone battery charging from 12V DC source

    Thanks for the reply!
    Yes, new phones do rely on USB-Power Delivery for power negotiation. However, I was referring to a very simple charger without any power delivery control.
    I will proceed with...
  18. [SOLVED]Closed: Cell phone battery charging from 12V DC source

    Hi!
    I am working on a small project which requires charging a cell phone lithium battery from a 12V source. Input comes form a 12V lead acid battery and output goes into the USB port of the cell...
  19. Closed: Optocoupler feedback in flyback converters

    Hi!
    Most flyback controller ICs have a feed-back pin that needs to be connected to the output of an opto coupler. What is the mechanism behind this?
    I mean what is required by the IC at the...
  20. Closed: Re: Gate driver for non inverting buck+boost converter

    I was saying that "ALL" the energy is stored in inverting bubk-boost converter. And in non-inverting buck-boost all the energy need not be stored. So I was wondering whether a non-inverting buck...
  21. Closed: Re: Gate driver for non inverting buck+boost converter

    Thanks for the reply.
    By better performance I meant less noisy.
    Consider a buck-boost converter operating in buck mode. In every cycle, all the energy needed by the load is first stored in the...
  22. Closed: Gate driver for non inverting buck+boost converter

    Hi!
    I am wondering what kind of gate driver is used for a non inverting buck+boost converter. (Not the normal buck-boost).
    I am referring to the circuit attached in the image here.

    My concern is...
  23. [SOLVED]Closed: Re: Acceptable SNR for radio transceiver ICs

    Thanks for the replies.
    I am talking particularly about AX5043 which is a radio transceiver chip by ON Semiconductor intended to for <1GHz radio link. My frequency of interest is around 200MHz....
  24. [SOLVED]Closed: Acceptable SNR for radio transceiver ICs

    Hi!
    Radio transceiver ICs mention their receiver sensitivity and transmitter power level. Example -120db/20db.
    However they do not mention the acceptable SNR. My concern is that if I were to make...
  25. Closed: Re: Feed line for connecting SMA connector on PCB

    Thanks for the reply.
    I'll make the trace around 10mm in length.
    Also, is the tuning circuit ok?
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