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Type: Posts; User: Zak28

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  1. Replies
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    Closed: Re: would iron wire block high frequencies

    Would it also slow down sharp unidirectional di/dt edges?
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    Closed: would iron wire block high frequencies

    Would iron wire become hysteritic and attenuate high frequency AC if it were used as a conductor?
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    [SOLVED]Closed: Re: Diode performance specification

    Most small SMT diodes dont have any charts for recovery time or di/dt.
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    [SOLVED]Closed: Diode performance specification

    Is a fast recovery diodes maximum reverse recovery time the same speed during its max forward current & Repetitive peak reverse voltage or is it much longer than what was specified?
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    Closed: Re: H bridge with IR2110

    There are self oscillating half/full bridge inverters with builtin dead time and can vary frequency with simple components including a potentiometer.
    ...
  6. [SOLVED]Closed: Re: Do The Input And Output Capacitors Effect Efficiency In Switching Regulators

    Wouldn't the ideal method to reduce ESR be to break up the recommended 22uF from switcher datasheet - into 3x 10uF capacitors thereby reducing ESR?
  7. [SOLVED]Closed: Re: Do The Input And Output Capacitors Effect Efficiency In Switching Regulators

    Is this largely due impart MLCCs being leaky?
  8. [SOLVED]Closed: Do The Input And Output Capacitors Effect Efficiency In Switching Regulators

    Would increasing the input and output capacitances were the load is~2mA @ 25v and input is ~8v prolong the battery life?

    For this switcher 155382
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Most datasheets do not mention anything about the material the windings are on. That document isn't of much use for inductors which doesn't have its material specified.
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    Closed: Re: MOSFET instead of planar resistors

    What feedback arrangements are there without high speed opamps?
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    Closed: MOSFET instead of planar resistors

    Is it fine to employ to220/247/3P MOSFETs as resistors inplace of similarly packaged planar resistors for constant loads and for switched loads?

    The NMOS would be biased with a precision pot at...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    There are many ferrite formulations each with their capabilities many ferrites will become very lossy at 1200khz with slight magnetizing current.



    They don't need to estimate, they should take...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    There should be a distinct parameter or table depicting core losses as a function of magnetizing current and frequency.

    Currently most datasheets are insufficient about their material losses.
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Can core losses be mitigated for 1200khz by avoiding shielded or partially shielded inductors and use higher resistance parts instead to avoid core losses, or does winding resistance incur greater...
  15. [SOLVED]Closed: obtaining dielectric constant for of a polymer

    Measured 0.480nF for a 8cm x 5cm area using aluminum foil tape, dielectric thickness 0.2mm.

    Whats the method to find dielectric constant for the polymer?
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Is a 1000uH inductor with Q (from datasheet) of 40 measured at 0.796Mhz very lossy for 1200Khz operation?
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Is the SRF more likely to give issues to a switching regulator than a lossy core material?

    Perhaps a lossy material is fine to use if its not saturated to high losses causing excess heat to the...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Much akin to lambda power supplies in which among other things TDK capacitors are utilized. Also TDK is a well known supplier of a vast variety of ferrites. They appear to have much works with...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Perhaps the manufacturers dont prefer to maintain costly measurement equipment which must be calibrated regularly which must measure a certain quantity from each batch for it to provide some accuracy...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    What are these curve depicting? https://www.digikey.com/product-detail/en/tdk-corporation/SLF12575T-221M1R3-PF/445-174412-1-ND/5880186

    It seems somewhat related to Q and impedance.


    155246
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    [SOLVED]Closed: Inductor quality value for switching regulators

    Does an inductors quality value also mean its ferrite material will have minimal losses at the frequency at which it has highest quality value?
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    Closed: Re: Switching regulator peak current

    The diode in the fabbed board and is PMEG3050EP which is very efficient.

    https://assets.nexperia.com/documents/data-sheet/PMEG3050EP.pdf

    Also the input and output capacitors are a pair of X5R...
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    Closed: Re: Switching regulator peak current

    It wasn't the same frequency rather constant buzzing with periodic higher amplitude peaks however it was very low and simply holding the pcb often caused enough flexture or rigidity to remove the...
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    Closed: Re: Switching regulator peak current

    It infact was a pulsed load ~4.5mA and with a 6.8uH inductor it must have been pulsing large currents regularly.

    Made an openoffice Calc spreadsheet which rapidly computes the 4 equations based on...
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    Closed: Re: Switching regulator peak current

    Does this imply CCM - a state were there is only an average current in the inductor is the least wasteful state of the boost converter?
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