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stability
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  • Forum Post: Re: UCC3837

    Bill Stokes
    Robert, Typically the stability of the LDO is verified by applying a repeated step load, every few milliseconds, from say 25% of full load to 100% of full load to the output of the regulator. The output voltage will experience loading transients as the load steps high and low. The amplitude of the...
    on Sep 3, 2010

  • Forum Post: Re: TPS73501, Feedback Capacitor

    Bill Stokes
    Hello Rhino, Q1 Response: The original test/design engineers decided that under certain load and line conditions that the phase margin was too low, and so they recommend that a zero & pole combination be added to the control loop (accomplished by adding the feedback capacitor, Cfb). Yes, you are...
    on Dec 14, 2010

  • Forum Post: TPS73HD301 RESET function issue.

    Hughie Lu64602
    Hi Sir, I have several issues about TPS73HD301 by our customer. They use this part as voltage regulator and supervisor for TMS320VC5501. But they found the RESET function sustained active when system power on. 1. The output voltage of adjustable regulator is 1.26V, but in terms of the description...
    on Jan 13, 2011

  • Forum Post: TPS76333 stability

    Antonio Lena
    Hello, I am using the TPS76333 to generate a secondary power supply from a 5V stabilized input supply. In the design I contemplated as output capacitors for the TPS76333 a 10uF tantalum plus a 100nF ceramic in parallel; using as main capacitor a tantalum one, I did not contemplate any additional...
    on Mar 23, 2011

  • Forum Post: Re: TPS76333 stability

    Michael Day
    Be sure to always follow the datasheet recommendations for external component selection. You can examine stability by applying a load transient on the output of the TPS76333. If the output voltage waveform as viewed on an oscilloscop rings less than three times, you can consider the design stable. Please...
    on Mar 23, 2011

  • Forum Post: Re: TPS76333 stability

    Antonio Lena
    Hello, thank you for your prompt and detailed answer. I am performing some tests on our boards and they seem to exhibit one or two complete oscillations.. so they seem stable. Nevertheless I still have a doubt : even if I follow the design rules of the datasheet, choosing for example one of the...
    on Mar 28, 2011

  • Forum Post: Question:What type of capacitor should be used with LM317L?

    Toshiya Hiramatsu
    Hi, I'm not sure what type of capacitor is used to stabilize output. LM317L's datasheet(page3) states that "All characteristics are measured with a 0.1uF capacitor across the input and a 1uF capacitor across the output." But it doesn't teach me what type of capacitor I should...
    on Apr 1, 2011

  • Forum Post: tps703xx output in parallel, to make more powerful LDO

    Vitaliy ARSHINNIKOV
    We use tps70302 in our design. Pls., give me answer for the following. Can we connect output pins of some tps70302 in parallel to make more powerful LDO? We use this IC as LDO 3,3V to 1,224V ( internal reference voltage of tps70302 is 1,224V). So we connect out pin directly to FB pin. And if we can connect...
    on Apr 7, 2011

  • Forum Post: Re: TPS71701 Issue

    Bill Stokes
    Hi Frank, A pi-filter at the output of an LDO can cause the LDO to be unstable if the frequency domain double-pole of that filter falls within the control loop bandwidth of the regulator circuit [Fp = 1/ (2*pi * root(L*C) = 1/2*pi*root(10u * 22u) = 10.7kHz]. One solution would be to increase that...
    on Nov 29, 2011

  • Wiki Page: TPS7A7001 Output Capacitor and ESR

    Darwin Fernandez
    Q: For the TPS7A7001, I am concerned about stability. According to Figure 3, a no/light load, there is a minimum ESR required that is not neccesarily in the range of ceramic caps. With that, the use of ceramic capacitors the device is not stable at no load. Even the EVM would not be stable at no load...
    on Mar 21, 2012

  • Forum Post: LP2951 - Stability problems when connecting a load-resisistor between LDO-ground and supply-gnd

    Nico Loeffler
    Hi everyone, I use the LP2951 in a special configuration. A schematically picture is added below. The problem is, that the ground of the LDO lies not on the power-supply-ground. Between power-supply-gnd and LDO-gnd is a resistor that is variable. Because of this the LDO runs NOT stable. It comes...
    on Feb 4, 2013

  • Forum Post: LM2941 Output Capacitor

    Gregory Watkins
    Datasheet for LM2941 specifies minimum of 22uF for the output capacitor in order to maintain stability. Is this reccomendation for nominal capacitance or should measures be taken to ensure Cout is >22uF over temp, frequency, lifetime, etc. Additionally are there any known problems with the output...
    on Feb 4, 2013

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