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Type: Posts; User: malli_1729

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  1. Replies
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    Closed: Re: Buck converter vs buck-boost converter

    If
    Vin > Vout - Use buck
    Vin < Vout - Use Boost
    If vout can be higher or Lower than Vin and automatic buck/boost switchover is required then use Buck-Boost.
    Most of the buck-boost converters...
  2. Closed: Re: TPS54560: Voltage is dropping when load connected

    "isn't there any alternative for breadboard except PCB? because I want to check with different component values.
    And one more qsn. is what big companies are using?"

    -> These converters layout...
  3. Closed: Re: Limit Current Maintain Voltage PSU output

    Use PTC+Zener combination. Better to use PolyZen from little fuse
  4. Closed: Re: Why would a scope suddenly give noisy traces when it never used to?

    I don't see much data on the scope.

    I am just giving general guidelines, i see these will help to distinguish noise is actually coming from board or scope.

    one of the Common thing to note when...
  5. Closed: Re: Square wave generation without Microcontroller

    See TimerBlox tools from Linear.
    https://www.analog.com/en/products/clock-and-timing/timerblox.html

    they are very good simple pulse generators,square wave generators etc.
    LT6990/1/2
  6. Closed: Re: [moved] Calculate the Input/Output Capacitor Value on DCDC converter

    Google search has lots of results.
    on brief,
    Input capacitors are decided based Ripple current handling,Vin ripple, filtering requirements
    Output capacitors are decided based on Vout ripple,...
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    Closed: Re: DDR3 hardware circuit design

    See any design guides for DDR3 design mainly from MICRON or from your controller manufacturer.

    TN-41-08: Design Guide for Two DDR3-1066 UDIMM Systems
    TN-41-13: DDR3 Point-to-Point Design Support...
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    Closed: Re: How long will resistor last at 104 degC?

    You said Power dissipated in resister is 0.5W, ambient is 50C.
    from datasheet, this resister is rated to 3W , actual power is 17% of total power it can withstand. from graphs max temperature rise...
  9. Closed: Re: Design of a PCIe card with USB and Ethernet

    If FPGA is not hard stop, there are many processors from TI,NXP/Freescale, Renesas etc which can support USB 3.1,PCIe and Ethernet. Even some high end controllers from Atmel or equalent will support...
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    [SOLVED]Closed: Re: operating a zener to specified values

    They are very clear i believe, Vz and Izt
  11. Closed: Re: How to Judge Whether IC is Working Correctly in Electronic Circuit or Not

    Make sure your basic inputs to function the IC are given and proper like Supply, Clocks, Resets, default state of IOs etc.
    After that try to measure any response from IC, like Output clocks (which...
  12. Closed: Re: calculating current requirement of LDO and switcher

    1. 12V to 5V @ 1A LDO has source current 1A +Quiescent current(in few mA/uA) of LDO.
    2. I am not expert on this, But you can't calculate input power directly 220*0.118, because it is AC not DC.many...
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    Closed: Re: Operating multichannel mosfets

    The power dissipation specified is for whole package (hence it should be for 2 MOSFET's in total, for single mosfet it will be half).
  14. Replies
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    593

    Closed: Re: Operating multichannel mosfets

    what do u want to do? those mosfets have separate GATE,DRAIN,SOURCE terminals, so, they are independent mosfets.
  15. Replies
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    Closed: Re: MOSFET gate current calculation

    Need a series resistor (e.g. 50 to 100 ohm) to limit the uC port current within maximum ratings.
    --Yes, i agree
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    Closed: Re: MOSFET gate current calculation

    Put the circuit diagram, how you want to handle this.
    Switching frequency - 1 Khz, Time period = 1ms. 2% Duty cycle - ON time = 20 uS.
    Assume 10% of ON time as Rise time and 10% as Fall time(Best...
  17. Closed: Re: obtaining 1206 chip resistor voltage rating

    Got it. I agree with you.

    Klaus, can you tell me is this package specification or every resister has specific voltage value.

    What i want to say is,
    I say it is package specification/family...
  18. Closed: Re: obtaining 1206 chip resistor voltage rating

    As per my understanding, Resisters won't have voltage rating for operational purposes, they will have only Current limt/Wattage limit not the voltage limit. Voltages will be indirectly handled.
    They...
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    Closed: Re: Video Decoder selection guide

    I feel there is nothing like "Best Video decoder" . Select according to specifications. any one from Ti/Analog/Renesas(intersl) etc.
  20. [SOLVED]Closed: Re: Power consumption of TDA8029 USIM controller with 3V/5V cards

    I got current measured from counter parts. max current for 5V card <30mA ( it is similar to other equalent manufacturer parts like SEC1120).
  21. [SOLVED]Closed: Re: Power consumption of TDA8029 USIM controller with 3V/5V cards

    " It should be almost easy to estimate the maximum and typical current consumption for different input supply voltage levels, presumed you know the actual card current."
    I want to confirm board...
  22. [SOLVED]Closed: Re: Power consumption of TDA8029 USIM controller with 3V/5V cards

    We don't have that board(old version of board designed few years back we are modifying that board) with us currently. No measured data even. As i said in 1st msg, TDA8029 current consumption varied...
  23. [SOLVED]Closed: Re: Power consumption of TDA8029 USIM controller with 3V/5V cards

    that's snap from TDA8029 datasheet, i want current consumption for different scenario as mentioned in my question.
  24. [SOLVED]Closed: Power consumption of TDA8029 USIM controller with 3V/5V cards

    we are using TDA8029 in one of our application board. Just a summary of the circuit.

    TDA8029 in our board connects a USIM card and reads the data and sends on UART.

    In our board, 2 supply...
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    Closed: Re: SPI Maximum distance

    do u want to connect master and slave on board or using cables.?
    on PCB you can simulate (general sim) microstrip/stripline to see the signal quality and decide on distance. that should give...
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