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  1. Replies
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    284

    Closed: Re: STM32F3 built-in opertion amplifier

    The minimum load resistance IS NOT a function of voltage. Yes this is primary function of current and for full resistive load is current function of voltage.
    Because this entry does not contain any...
  2. Replies
    7
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    284

    Closed: Re: STM32F3 built-in opertion amplifier

    With this approach, the min Rload information is slightly obscured.
    Why is Rload min 4K for 2V and not 2k for 1V?

    Look at any datashet even for the cheapest amplifiers for example LM358...
  3. Replies
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    284

    Closed: STM32F3 built-in opertion amplifier

    I look into datasheet STM32F303 page 122 6.3.21 Operational amplifier characteristics and I'm a little confused.

    ILOAD Drive current max 500uA
    RLOAD Resistive load min 4kOhm

    Amplifier is...
  4. Closed: Re: What is the difference between IRF510 and IRF510N?

    Maybe.
    On the other side when you make counterfei why would you change the name?
    IRF510N are commonly found, for example
  5. Closed: What is the difference between IRF510 and IRF510N?

    Is N MOSFET IRF510 the same as IRF510N?
    If not what is difference?

    154505
  6. Closed: Re: Output inverter bridge for welding TIG machine?

    On the bridge it is even 2 * 27W, but I thing it is not problem , yes must be used heatsink and fan.
  7. Closed: Re: Voltage dimensioning MOSFET in Synchronous Buck ?

    Thanks for information. I have nominal voltage 48V, 55V as maximum with +15% and plan use 80V MOSFET.
  8. Closed: Voltage dimensioning MOSFET in Synchronous Buck ?

    I use Ti tools for create Synchronous Buck Converter and this tool suggested 60V mosfet in converter where in max input voltage 48V.

    My question is what is right VDS for Q1 and Q2 in Synchronoust...
  9. Closed: Re: How create negative voltage -700mV - -1000mV 30mA?

    My application not simple and dot low power , I need only small negative for tree CMOS op amp and GND must be GND.

    > What about a SC voltage inverter plus a negative voltage regulator?
    honestly,...
  10. Closed: How create negative voltage -700mV - -1000mV 30mA?

    I need create negative voltage -700 - -1000mV max current 30mA (typical 5mA) from positive +5 or +3,3V and and all that best in simple and small.
    I thing switching capacitor , but small SMD IC have...
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    Closed: High current source?

    I'm looking for a conception for for construction current source ,
    requirements
    - current 0-75A
    - output voltage 0-24V
    - output power 0-1800W
    - programmable current with step 100mA
    - full...
  12. Replies
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    Closed: LM5176 or LM5145 CC/CV mode ?

    I need current source for Electroplating, it is
    power source with adjustable current 0-25A for voltage 1-20V output power 0-250W. in other words PS max 250W with adjustable CC mode and adjustble CV...
  13. Closed: Re: Equivalent curcuits of gate N-mosfet for simulation?

    Manufacturer do not public S parameter and PSPICE model.


    For example I create simulation simple RF PA with 2 NMOSFET
    as second transistro is used IRFP048N with Ciss 1900pF
    in first picture is...
  14. Closed: Equivalent curcuits of gate N-mosfet for simulation?

    I need simulate matching networks for driving RF N-MOSFET, unfortunately for this transisfor t does not exist PSPICE model.
    i it is possible to create an equivalent circuit for the gate from the...
  15. Closed: Re: 2 Stage RF MOSFET PA design book or example / app note

    I will clarify the query

    1. Input impedance of 1 stage transistor
    Is input impedance in this stage resistance R100k Ohm + reluctance of Gate capacitor IRF510 Ciss 180pF ?

    And how calculate...
  16. Closed: 2 Stage RF MOSFET PA design book or example / app note

    Do you advise a book or other source of information to teach me desig 2 stage RF PA for frequence under 30Mhz?

    Any as see pic.

    I know little about it, but
    - I can not determine the input and...
  17. Closed: LC filter for voltage smoothing, choice C and L?

    I propose a 4th order filter for smoothing the voltage for the RF power transistor amplifier.
    See on picture
    Q1 and L1 is RF power amplifier on 10MHz
    C10,C5,C4,C3 is voltage source for this...
  18. Replies
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    2,247

    Closed: Re: WS2812B SMD RGB LED on 3.3V?

    Yes but
    - 3,5V need Adj LDO and these are two extra resistors
    - I worsk with MCU STM32 and unfortunately, for most MCUs, ST did not output a voltage reference input and Vda is VRef too and change...
  19. Replies
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    2,247

    Closed: WS2812B SMD RGB LED on 3.3V?

    I was impressed by the Chinese RGB diode with the controller WS2812B
    I would like to use it as a signal LED to the MCU.
    According to the datasheet requires a supply voltage of +3.5V to 5.3V
    Which...
  20. Replies
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    1,172

    Closed: Re: LM2675 replace with LM76003 ?

    Thank you all for the information.
    I'll try and see.
    Still a question about the use of ceramic condensers in DC / DC converters
    Electrolittics capacitor have some (relatively small lifetime) for...
  21. Replies
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    1,172

    Closed: Re: LM2675 replace with LM76003 ?

    Yes stability of feedback lookp is one of the questions.

    Now is 52kHz
    LM2576HV + 470uH + 1000uF Low ESR as standard output stage of DC/DC Switch converter
    to suppress interference from RF...
  22. Replies
    9
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    1,172

    Closed: LM2675 replace with LM76003 ?

    Hello
    I have an older design in front of me and I'm thinking about modernization and shrinking.
    The original design looks like this.
    DC/DC Stepdown 3A LM2576HV-Adj make output DC voltage for ...
  23. Closed: Re: Low Cost, DC to 50 MHz, 60 dB Logarithmic Amplifier?

    Whether better depends on the angle of view.
    AD8307 has 92dB, but also Slope of 25 mV/dB,
    it would be better for me 60dB and Slope of 50 mV/dB,
    +30dB is for me not usable and 2x higher Slope is...
  24. Closed: Low Cost, DC to 50 MHz, 60 dB Logarithmic Amplifier?

    I need measure power on RF line and search subj.
    My firs choice is AD8307 , on ebay 1$, but ihis is 92bB there may be an equivalent of 60dB.
  25. Replies
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    Closed: Re: Crystal oscilator and load capacitor?

    You have true with HC it is not works and DC is 50:50.
    One more question

    See on pic in my post #8
    Is possible remove all to the left of the resistance R42 and and replace it with active...
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