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    Closed: Re: NMOSFET On high side?

    expensive is High side mosfet driver, IRS10752LTRPBF have price about 0,5$ , roughly 2x more than a solution with three transistors.


    It is simple, my load is heating resistance in series with...
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    Closed: Re: NMOSFET On high side?

    Yes, it is possiblem but,
    1xR + 1x zener + 1x C +1x expensive high side mosfet driver
    advantages faster switchung time (switching us only 400Hz)
    disadventage significantly higher price, higher...
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    Closed: Re: NMOSFET On high side?

    Thank you for your suggestions
    1. Use integrted High Side MOSFET driver.
    Why not, but where can I find driver that
    - it suffices with supply voltages +5V or +25V or +50V
    - have price max aroud 1$...
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    Closed: NMOSFET On high side?

    Hello, I need place NMOSFET ON High side and control it with PWM approx. 400Hz.

    Q5 switch 25V to about 8Ohm Load. In device is 50V too.
    My solution
    Becouse Gate to Source volatge on Q2 is...
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    Closed: Re: RF CV to CC Converter?

    OK real not not rounded measurement data
    On 100kHz I on one load measure 2,76uH and her is impedance measurement on frequency 10,5MHz 44,21 Ohm.
    100ms is secondary control and has no effect on...
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    Closed: Re: RF CV to CC Converter?

    I couldn't sleep, and I sketched the part behind the circuit called CVCC
    - sine over 10MHz is input to the CVCC circuit (from LPF)
    - then it is L 400nH torid T68 + C 100pF Silver mica and N...
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    Closed: Re: RF CV to CC Converter?

    It also feels like that, but in documentation is block diagram any as
    154684

    in the description and the detailed scheme then follows
    RF PA - standard PA with two MOSFET
    IMC - impedance...
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    Closed: Re: Built-in SWR bridge and power meter

    You are right on the other side, but it also applies.
    C1/C2 more precise Z1/Z2 is only voltage divider for sampling voltage on line, current is sampled over L1.
    Her is SWR meter where is voltage...
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    Closed: Re: Built-in SWR bridge and power meter

    Yes it uses a capacitive divider.
    It is SWR applicable to the whole band.
    I will do with a single frequency.
    So I dared to replace the lower C for the resistance R=Xc on my frequency.
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    Closed: Built-in SWR bridge and power meter

    I have about 100W PA on fixed frequency under 20MHz this PA works to 50Ohm load.
    Because the load can be disconnected, damaged, dis-tuned I need to track SWR. I need built-in SWR.
    I was looking at...
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    Closed: Re: How drive 200pF load on 15MHz?

    Thank you.
    Unfortunately, I forgot to emphasize one desired feature. I need hi level output voltage over 5,6V. 74HC04 permits Vcc 6V, I use 5,7 - 5,8V and Hi voltage level = Vcc.
    in the picture,...
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    Closed: Re: How drive 200pF load on 15MHz?

    In first version was as clock used 15MHz crystal with one inverter from 74HC04, 5pcs inverter increase current for driving 200pF Load.
    In second version is as clock source used crystal oscillator...
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    Closed: How drive 200pF load on 15MHz?

    I have TTL clock 15MHz and need drive 200pF load
    Now I use 5 inverter from 74HC04, It works fine, but case SOIC14 is to big and i search small solution.
    Can you help me?

    154510
  14. Closed: Re: Multiprocessor comunitacion USART in STM32Fxxx ?

    With communication at first glance nothing, I mention this because of the specification of the environment and sources of interference.In other words on every board is flowing up 20A and is high...
  15. Closed: Re: Multiprocessor comunitacion USART in STM32Fxxx ?

    OK I will specify the details.
    Board is primary synchronous buck converter 1-40V / 0-25A switching frequency is over 220kHz with full ceramics input and output capacitor.
    MCU over DAC set output...
  16. Closed: Multiprocessor comunitacion USART in STM32Fxxx ?

    I looking for an example of use Multiprocessor comunitacion over USART with hw realisation.

    I need to connect 4 MCUs on 4 boards, about 10cm between processors, speed 38400bps.
    It looks simple,...
  17. Closed: Re: Voltage rating for MOSFET in full bridge?

    As capacitor I have 2x 4700uF 450V
    and direct on high side MOSFET I thinking about 0,47uF non inductive or 1uf non inductive capacitors.
  18. Closed: Re: Voltage rating for MOSFET in full bridge?

    I will be more specific.
    I would like to build an induction melting furnace 3.5kW.
    Any as full-bridge LLC resonant inverter, see picture
    Here Lcoil is largely variable depending on the content of...
  19. Closed: Voltage rating for MOSFET in full bridge?

    I think about Resonant LLC Converter with full MOSFET bridge on primary side (3kW on 230V).
    My question is simple.

    What minimum voltage must the transistors have?
    Is 500V good choice or is...
  20. Closed: Re: Concept of a laboratory power source 0-50V 350W?

    Thank you for the types.
    about using full bridge I thought for a while, I liked it STM32F334 and full digital H bridge controll.
    Unfortunately, ST also manufactures a full-bridge power source demo...
  21. Closed: Concept of a laboratory power source 0-50V 350W?

    I'm thinking about designing a laboratory resource.
    Basic requirements

    Output voltage 0-50V
    Output current 0-25A
    Output power 350W max
    Precise voltage, current and power regulation...
  22. Closed: Re: Search engine for transistors / transiotor comparator?

    OK loon on page 7 in datasheet IPW60R125CFD7
    Dagram 1: Power dissipation
    For 25C 92W for 50C 73W, if we look on Diagram 2: Safe operating area VDS=20V Io=1A we are in 10ms area and 92W transistor...
  23. Closed: Re: Search engine for transistors / transiotor comparator?

    If everything is okay for nothing,because the power is consumed in the load.
    Unfortunately in the application unexpected disconnection of the load is a common thing.
    If load is disconnected , power...
  24. Closed: Re: Search engine for transistors / transiotor comparator?

    This MOSFET is in to second stage two transistor Class F amplifier on frequency over 10MHz and is drive from MOSFETm if I'm not mistaken IRF510.

    The colleague suggested first stage for parameters...
  25. Closed: Search engine for transistors / transiotor comparator?

    I need to find a MOSFET transistor according to its switching speed and other parameters
    Or need equivalent MOSFET, again with an emphasis on switching speed.
    There is something like that?

    What...
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