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TPS54310
Related Posts

  • Forum Post: Re: A likely typo in TPS54310 document (used in EVM6437)

    JohnTucker
    Yes you are correct, that is a typo, Any non-isolated dc-dc converter topic can be posted here. Linear regulator questions should post to "linear regulators"
    on Feb 21, 2011

  • Forum Post: Re: Question on SS/ENA pin of TPS54310

    JohnTucker
    There are 3 possibilities for SS/ENA: These first two use the "slow start" function of the IC: 1. SS/ENA pin is open. The converter will start up at the internal slow start rate. This is the case for the EVM. 2. SS/ENA with capacitor to ground. There is an internal constant current...
    on Mar 3, 2011

  • Forum Post: Re: Question on SS/ENA pin of TPS54310

    JohnTucker
    1. Yes EVM refers to teh official EVM (SLVP201) I do not know what "EVM6437" refers to. It is not an official EVM released by the product line. 1a. J2 is a header used as test points. You can connect SS/ENA to GND with a shunt to disable the IC. 2. It looks that way. There ia a slow start...
    on Mar 3, 2011

  • Forum Post: Re: Question on SS/ENA pin of TPS54310

    JohnTucker
    If you are cascading PWRGD to SS/ENA (one PWRGD output feeds one SS/ENA input) there should be no limit. Bear in mind that the previous voltage will need to complete its slow start sequence and be in regulation before the susbsequent voltage can begin its slow start sequence. If using one PWRGD output...
    on Mar 3, 2011

  • Forum Post: Re: Question on SS/ENA pin of TPS54310

    JohnTucker
    The PWRGD pin is open drain. To actually have it go high you will have to pull it up to an external rail
    on Mar 3, 2011

  • Forum Post: Re: Question on SS/ENA pin of TPS54310

    JohnTucker
    For these parts, when PWRGD is not good, te internel FET is ON. When the voltage goes into regulation, the PWRGD FET is turned OFF. If it is connected directly to the TPS54310 SS/ENA pin, no additional pullup is required.
    on Mar 3, 2011

  • Forum Post: Re: Question on TVP54310 thermal pad

    JohnTucker
    Tat is requiring a minimum of 3.3 square inches of copper area connected to the exposed powerpad under the device. For pest results, that copper should be on teh back side and conneted to the powerpad area on the top side with thermal vias. BTW, you keep referencing EVM6437. What is that design? Where...
    on Mar 3, 2011

  • Forum Post: Re: Do I need thermal treatment on tracks?

    JohnTucker
    Almost all of the power is dissipated in the high and low side FET switches. these are internal to the TPS54310. There is also some significant amount of power dissipated in the output inductor. The power in the input and output cpacitors due to RMS ripple currents is quite small and can be ignored so...
    on Mar 11, 2011

  • Forum Post: Re: Question on 54310 compensation network

    JohnTucker
    Unfortunately, there is no "easy solution". The TPS54310 uses voltage mode control with external compensation. This makes for a very versatile control function that can accommodate most any type of output filter. With voltage mode control, the output voltage can be set using just the lower...
    on Apr 19, 2011

  • Forum Post: Re: Low-ESR capacitor for TPS54310

    JohnTucker
    That looks to be a non-polarized ceramic capacitor. Even though the ESR is not specified it is probably low. However I do not recommend using Y5V dielectric in this application. You should use X5R or X7R.
    on Apr 22, 2011

  • Forum Post: Re: Question on TPS54310 output inductor

    JohnTucker
    I do not know the source of your schematic. i can tell you that it is not an officially supported "EVM". To answer your general question: The inductor minimum value is typically calculated by: L = (Vout/Vin) * ((Vin-Vout)/(Iout*Fsw*Kind)) where Kind is the percentage of ripple current relative...
    on May 1, 2011

  • Forum Post: Re: “ripple” in TPS54310 voltage output

    JohnTucker
    What you are trying to trigger on is not "ripple" but rather "switching noise". The amount od observed switching noise is very dependent on measuring technique. To accurately measure ripple, You need to use "tip and ring" or probe with very short (< 1 cm) ground lead...
    on Jul 22, 2011

  • Forum Post: Re: TPS54310 failures

    JohnTucker
    The second waveform looks good to me, the first as you noted is marginally stable. If the design is completely unstable it may not start up properly, but should not damage the device. usually you will see "bursts" of switching pulses on PH, not a steady dc level. You can submit failed...
    on Aug 8, 2011

  • Forum Post: Re: TPS54310 failures

    JohnTucker
    It looks like this is going to go to FA. We will need to see your schematic, layout, any waveforms you may have and a detailed description of the observed failure and the test conditions under which it occurred. If you can provide this information up front it will speed up the analysis.
    on Aug 8, 2011

  • Forum Post: Re: How to select component values for TPS54310 according to current value?

    JohnTucker
    There are many possible "correct designs" for a given set of input conditions. The design algorithms may differ slightly to choose the output filter components and compensation network. You can use switcherpro or if you prefer manual calculations you can use the methods outlined here; http...
    on Sep 30, 2011

  • Forum Post: Re: How to select component values for TPS54310 according to current value?

    JohnTucker
    That schematic was most likely designed by someone in the DSP group. I have no direct knowledge of it. If you can provide a copy, I may be able to give you some advice. I may also be able to provide a copy of the old SWIFT designer software. If I can it will be "use at your own discretion"...
    on Oct 3, 2011

  • Forum Post: Re: TPS54310 and TPS54610 - ESD HBM and MM

    JohnTucker
    HBM = 2 kV MM= 150 V
    on Oct 25, 2011

  • Forum Post: Re: TPS54310: Are Phase input/output pins voltage output pins?

    Anthony Fagnani
    Hi Zheng, Yes, the PH pin is the switching node and is connected to the inductor of your output filter for the buck converter. The reason this is labeled as an input in addition to an output is if the condition occurs where the VSENSE voltage is higher than the reference voltage, the PH pin will sink...
    on Oct 27, 2011

  • Forum Post: Re: TPS54310: Are Phase input/output pins voltage output pins?

    JohnTucker
    The PH node is not the output in the sense that it is the regulated output, rather it is the "switching node". the regulated output voltage is the average voltage of the PH voltage . Also this is a synchronous buck. So when the output current is low, the PH pin will sink current during the...
    on Oct 27, 2011

  • Forum Post: Re: TPS54310 Package

    JohnTucker
    The TPS54310 only comes in one package, 20 pin PWP. I think you may be referring to the power dissipation rating, which shows for both powerpad soldered to the PCB and not soldered. I would ignore the "not soldered". I highly recommend that you solder the powerpad to the PCB for optimum performance...
    on Jan 9, 2012

  • Forum Post: Re: TPS54310 Package

    JohnTucker
    Cout is the output capacitance, C2 in figure 1. It can be (and often is) more than one physical capacitor. So the terms Nc x Cout represent the total output capacitance. If you are using ceramic output capacitors make sure to derate the capacitance due to dc bias effects (see the mfg. datasheet).
    on Jan 10, 2012

  • Forum Post: Re: TPS54310 Package

    JohnTucker
    The SS/ENA pin can be used to extend the slow start time. There is an internal slow start of 3.35 msec typical. That is the slow start time with SS/ENA open. You can add a capacitor to SS/ENA that will be charged with a constant current of 5 uA typical at start up to allow the start up time to be longer...
    on Jan 23, 2012

  • Forum Post: Re: TPS54310 Package

    JohnTucker
    1. Slow start controls the rate at which the output voltage ramps up from 0 V to the regulated output. If it is not controlled by such a mechanism it may have non-monotonic start up or over-shoot and ringing at start up. Additionally it serves to limit the inrush currents and allows the output capacitors...
    on Jan 24, 2012

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