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Related Posts

  • Forum Post: Re: input ripple rejection using a TPS62561

    Michael Day
    Can you post a schematic, including all bypass capacitors on the load. What is the total amount of capacitance on the output of the TPS62560? One potential cause of the ripple you see may be instability caused by too much external capacitance. This is different from noise. If the power supply is unstable...
    on Feb 8, 2011

  • Forum Post: Re: input ripple rejection using a TPS62561

    Michael Day
    I looked at the datasheet's recommended output filter components (inductor and capacitor). The range of LC corner frequencies when using recommended components is between 15.7kHz and 60kHz. If you use and LC filter combination with a double pole above or below this value, you run the risk of the...
    on Feb 8, 2011

  • Forum Post: Re: input ripple rejection using a TPS62561

    Michael Day
    From two posts above, I assume that when you say "bulk" capacitance, you are referring to the output capacitors that are to the right of the output inductor. Yes, TI designed these ICs to work with a minimum of output capacitance to help maximize your circuit's performance with minimal...
    on Feb 8, 2011

  • Forum Post: Re: input ripple rejection using a TPS62561

    Michael Day
    For a well designed board with fairly small trace resistance, the power supply does not distinguish between output capacitance at the power supply and bulk capacitance at the load. All capacitance must be added up and considered as part of the output capacitance for the power supply. Please note that...
    on Feb 8, 2011

  • Forum Post: TPS62561 - Oscillations on output voltage

    colin cook
    Sorry if someone else already covered this, but I did see it. The data sheet shows a low res capture of a single transition on the input, but I am seeing problems with over all noise rejection. My input has noise in the 200mV range at 20 to 30KH, and if the regulator is loaded, this noise passes right...
    on Feb 8, 2011

  • Forum Post: TPS62040 - Output is unstable

    Michael Day
    The TPS62040 output voltage appears to be unstable. The switch node is very noise and there is a lot of jitter. The duty cycle is not constant and changes from a value that is too low to a value that is too high. What can be causing this problem? I used the EVM's recommended components but generated...
    on Apr 6, 2011

  • Forum Post: Re: TPS62040 - Output is unstable

    Daniel Acevedo
    It is important that the layout also match that of the EVM. Poor layout can cause instability, poor line, load, and transient performance, excessive noise and jitter, less than maximum output current along with many other issues. Here are a few examples of rules you have violated in your layout...
    on Apr 6, 2011

  • Forum Post: Re: TPS54620 not stable with different load conditions.

    Nick McMilan
    Hi John, The requirements of my design does not allow me to change components. Can you please recommend one set of compensation values for my 6 conditions? Vout 2V and 5V, at Iout of 0A, 2A and 6A. When using Switcher Pro, it recommends 6 different set of compensation. When I try 2v or 5V...
    on Jun 10, 2011

  • Forum Post: Problem with TPS51315 frequency/output

    Nick Black
    I am using the TPS51315 using the schematic above and have some problems with a reliable output. I started out by depopulating R7 and R8 and using a 5k pot at J9. If I have the wiper all the way to one side where R7 becomes ~0Ohm, it outputs ~0.75V correctly, and then as I turn the pot I can get the...
    on Sep 9, 2011

  • Forum Post: TPS40200 Sensitivity

    123
    Hi, Would like to seek for advise on the sensitivity of the VDD and Isense pin of TPS40200. Tried to use the probe to Isense pin and the TPS40200 just reset. Another test done is the ESD test. Kindly refer as below, Channel 1 as VDD, Channel 2 as Isense. At this transient of ESD, the 3.3Vo dipped...
    on Sep 29, 2011

  • Forum Post: Re: TPS63020

    Daniel Acevedo
    The input and output capacitors need to be immediately next to the TPS63020; same with the capacitor connected to VINA. The feedback divider also needs to be very close to the GND pin. The GND pin should be connected to power ground under the IC. All of this is described and illustrated on page 19 of...
    on Dec 30, 2011

  • Forum Post: Can TPS5450 used for buck-boost topology? Is its internal compensation technology a bottle neck?

    Yanbin Zhao92331
    I applied sample of step down converter TPS5450. I want to use it to build a positive buck-boost converter since its compensation is included inside so that less components will be used. My requirement is Vo=12VDC, max output current is 1A, Vin=9VDC~16VDC. The positive buck-boost converter works...
    on Apr 1, 2012

  • Forum Post: TPS5450 instability & outright failure @ certain Vin voltages

    Grayson King
    I have the following TPS5450 circuit designed into a new product: Design is for Vout of 5.6V at up to 5A over a Vin range of 8V to 30V, and SwitcherPro says it'll work fine. I've checked the datasheet equations too and have found nothing that would indicate that I might have a problem. But...
    on Apr 22, 2013

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