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  1. Closed: Re: SMPS circuit showing an oscillation in the output current...current monitor probl

    Yeah just rework to lift the allegro out of the circuit and short around it. Now you’ll only see the result of noise pickup.
  2. Closed: Re: Input LC filter inductor is being shorted out

    0.7V of steady state ripple would surprise me. Run a simulation to see if it’s possible or not. Could get a dual package and put 2 in series if you’re worried. And/or put an R in series too.
    ...
  3. Closed: Re: How to display ASCII state when simulating one-hot encoding FSM ?

    State is declared as logic [3:0], not ASCII. You happened to use parameters with human readable names to define it but that doesn't make it ASCII.

    You'd need to explicitly code your own mux or...
  4. Closed: Re: Need suggestion to select an (1GHz) Oscilloscope (Tek 5 series Vs R&S RTO2000)

    You sure you have the right price? I see a starting price of 14500 for the 5 series with 350Mhz bandwidth.

    I recently added a Tek3 series to our lab and I like it. The UI isn't totally amazing...
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    Closed: Re: MOSFET Driver TLP350

    Yeah and understand that driver current is a peak value that tells you how quick the driver can slew the parasitic capacitance of your mosfet. The average current out of the driver will be tiny. It...
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    Closed: Re: Circuits for P, PI and PID controllers

    Two poles at the origin is stable. You can have 180 degree phase shift so long as it isn't at the crossover unity gain frequency.

    See this thread:...
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    Closed: Re: Single digital I/O circuit

    Digital isolators only go one direction. So you can't use one isolator channel as both an input or output.

    It is possible to multiplex multiple signals into the inputs of the isolator so long as...
  8. Closed: Re: Off-the-shelf tube needed for dummy load bank

    Reduced conduction losses doesn't need to be a priority in a load bank.
  9. Closed: Re: Which type of SMD capacitors are more robust against PCB flexion cracking?

    Yes I'd expect those are basically immune to board flex cracking.

    Personally I try to stay 1206 and below and make sure 1206 and above are flexiterm/automotive/J-lead (you can't avoid bigger...
  10. Closed: Re: Which type of SMD capacitors are more robust against PCB flexion cracking?

    I understand the metal or “J-lead” are better.
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    Closed: Re: Circuits for P, PI and PID controllers

    1) You'd want to choose a compensator topology that has 'enough' poles or zeros.

    TypeI: One pole
    Type II : 2 poles, one zero
    Type III: 3 poles, two zeros

    I: One pole
    PI: One pole, one zero...
  12. [SOLVED]Closed: Re: Different FETs for Top and Bottom FET in synchronous Buck converter

    Sure it makes sense and I've seen it done on large stepdown buck applications like this.

    Practically speaking you could choose a fet family that has multiple Rdson choices in the same package then...
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    [SOLVED]Closed: Re: Stopping a countdown timer from 9-0.

    if (counter == 0) begin
    counter <= 500000000;


    That resets the counter every time it reaches zero. Remove that and it should count once after being reset.
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    Closed: Re: Circuits for P, PI and PID controllers

    Control system 'tuning' may mean tuning the individual coefficients. It may also mean general control design. There is a lot more to control design than just tuning the bode plot of the compensator...
  15. Closed: Re: Adding an LC post filter can make an SMPS unstable....use RC filter instead?

    I highly doubt you can specify a useful RC filter without excessive losses or a gigantic C.

    Second, understand that any phase shift risks stability: a single extra pole and its 90 degree phase...
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    Closed: Re: P-channel Mosfet inverting control

    Yeah it looks generally sound.

    There are IC's that can do this too (load switches) such as FPF2700.
  17. Closed: Re: Adding an LC post filter can make an SMPS unstable....use RC filter instead?

    Well just follow the guidelines in your app note. Also see this one. They both address the problem.
    http://ridleyengineering.com/images/phocadownload/1%20second%20stage%20filter%20design.pdf
    ...
  18. Closed: Re: Using generate and for loop to index signal name

    For what its worth macros can manipulate signal names using ``. See how this creates two signals based on the string passed as "OUT". You could unroll your generate loop and replace it with one line...
  19. Closed: Re: Impedance vs frequency plot of input filter of SMPS?

    Simulate the circuit in figure 2.31a with about 50mOhm for the inductor resistance. Plot voltage at I1 with the Y axis set for log instead of db.

    Voltage at the current source is resistance when...
  20. Closed: Re: Why dooes offtheshelf DCDC module limit the numbr of parallel units?

    Where do you see '8' referenced?

    Regardless I assume its not a hard limit but rather it's based on practical difficulties of implementation - like ensuring that routing is well matched between all...
  21. Closed: Re: Input LC filter inductor is being shorted out

    I suspect the damping is desired for more than start up transients. Simulate their network and see how the bode plot looks.

    To damp transient and fault scenarios I’ve clamped inductors with...
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    Closed: Re: Phase detector with synchronous logic (FPGA)

    I'm familiar with doing phase detection in FPGA's (DFT or 'sin correlation') as suggested. The math is easy (multiply and accumulate versus sin and cos, do some algebra with the accumulator...
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    Closed: Re: Circuits for P, PI and PID controllers

    P is just a gain stage
    I is an 'integrator' google for examples of opamp integrators
    D is a 'differentiator' google for examples of opamp differentiators


    Also understand how PID maps to common...
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    Closed: Re: Fast amplifier using one stage OP AMP

    Great problem to explore in a simulator like LTSpice which has good models for almost all Analog devices (Linear) opamps covering all types and bandwidths.

    There you can see how well they can...
  25. Closed: Re: The "cheap, quick and easy" way to do high power SMPS's?

    Ok then.

    Ideally you’d phase shift them for interleaving.
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