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TPS5450
Related Posts

  • Forum Post: Re: TPS40055-EP TEMP RANGE

    Peter Miller13277
    Lou, Both devices have passed temperature cycle -65C to 150C, so both can support a storage temperature of -65C. Both devices have been characterized to -55C, so both can operate at -55C, but cold temperature start-up can not be guarenteed at to -65C.
    on Mar 9, 2010

  • Forum Post: Re: TPS5450 Current-limit

    JohnTucker
    The TPS5450 is a voltage mode control device. It is internally compensated and is expecting to regulate voltage rather than current. The current limit is a minimum 6 A over voltage and temperature. So I doubt that you are hitting teh current limit unless you are using a small value inductor (the current...
    on Sep 14, 2010

  • Forum Post: Re: TPS5450 Current-limit

    JohnTucker
    The EP parts may have different specifications. I don't support those, so I don't keep track of teh exact differences. I can tell you also, that the placement of the input decoupling capacitor is fairly critical for correct operation. Also, the thermal capabilities of teh TPS5450 are at the limit...
    on Sep 14, 2010

  • Forum Post: TPS5450 output overvoltage under light load

    Kevin Spahr
    Is Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 ...
    on Jan 25, 2011

  • Forum Post: Re: TPS5450 output overvoltage under light load

    JohnTucker
    I would have to see your schematics and waveforms before I could nmake any assessment.
    on Jan 25, 2011

  • Forum Post: Re: TPS5450 output overvoltage under light load

    Kevin Spahr
    I recognize that, in principle, this behavior could be explained by the behavior of a Buck in DCM operation where the conversion ration is non-linear with duty-cycle (DC). In DCM operation with light load, small inductance, or low switching-frequency, at low DC, the conversion ratio (M(d)) tends to be...
    on Jan 26, 2011

  • Forum Post: Re: Question about TPS5450-EP

    JohnTucker
    Yes, the internal reference is fixed. The output voltage will regulate so that 1.221 V appears at VSNS.. So if there is 1 V between the bottom of R2 and GND the output voltage will be 0.95 V. If there is 1 V between R2 and GND, the output voltage will be smaller as above. Vo = (Vref-Vdac) x (R1...
    on Mar 11, 2011

  • Forum Post: Re: Do I need damping circuit for TPS5450

    JohnTucker
    The TPS5450 uses inernal compensation. The output filter should be chosen so the LC corner and ESR zero align with the internal compensation poles and zeros. Adding a series resistor is one way to accomplish that but is not generally required. Another option is to use http://focus.ti.com/analog/docs...
    on Mar 17, 2011

  • Forum Post: TPS5450

    razn2
    I want to use TPS5450 DC-DC converter and I'm wondering whether unshielded inductor is enough to be used beside it or shielded one is required. Shielded inductors in (33-47)uH, (6-8)A range are pretty expensive and unshielded ones are more reasonable. Thanks
    on Apr 7, 2011

  • Forum Post: Re: TPS5450

    JohnTucker
    The TPS5450 will work equally well with shielded or unshielded inductors as far as teh dc/dc conversion process is concerned. From a system level, you may find that there is quite a bit more radiated emissions. If you can live with that then unshielded nductor is not a problem.
    on Apr 7, 2011

  • Forum Post: Re: TPS5450: Circuit changes to support long output cable?

    JohnTucker
    The TPS5450 is an internally compensated device. Your input voltage, output voltage and current will constrain the output filter as selected by switcherpro. So your performance will be predetermined. You will of course have to deal with the losses on your cable, but in general, that should not cause...
    on Apr 11, 2011

  • Forum Post: Re: TPS5450 PCB layout question

    JohnTucker
    There are different techniques you can use for grounding, but basically, there are two main approaches as you have noted. You can force the current flow by isolating traces and fill areas then connecting them together at one place "star ground" or tightly coupling all ground areas with multiple...
    on May 2, 2011

  • Forum Post: Re: a question about TPS5450's ENA

    Billy Shang
    Maybe the next question is a little stupid ,what's the meaning of the floating,I search the dictionary and can't find peoper meaning to explain it .English is not my first language.
    on May 6, 2011

  • Forum Post: Re: a question about TPS5450's ENA

    Billy Shang
    Thank you I just got it
    on May 6, 2011

  • Forum Post: Re: a question about TPS5450's ENA

    Billy Shang
    after the turn on ,if I still leave it unconnect will it go on working
    on May 6, 2011

  • Forum Post: Re: the output voltages of TPS5450 and PTN78020W/PTN78020H

    JohnTucker
    More correctly, when the TPS5450 is disabled, switching is inhibited. There s no internal discharge path in the IC to pull the output to zero volts. It will naturally decay to zero thru the feed back resistors, but is you have leakage paths to other active voltage rails in your circuit, you may observe...
    on Jul 22, 2011

  • Forum Post: Re: Question regarding to TPS5450 output inductor

    JohnTucker
    the maximum current limit for TPS5450 is 9 A. If you are concerned about absolute protection during all possible conditions such as a direct short on the output, then that inductor is not an optimum choice. For a typical 2 A output is is good. The saturation curve for that inductor is not particualrly...
    on Aug 25, 2011

  • Forum Post: Re: Question regarding to TPS5450 output inductor

    JohnTucker
    That is your call. If you want absolute protection for worst case short circuit conditions, then you neet to rate your inductor for that. If you want a smaller size, then you can select for maximum normal current rating. One advantage to picking a higher current rating inductor is that you will also...
    on Aug 30, 2011

  • Forum Post: Re: Need information regarding thermal impedance analysis...

    JohnTucker
    The TPS5450 and TPS54332 probably only have theta JA based on teh EVM board. I can request thermal data from our packaging group. It may take a couple weeks to ge the data.
    on Sep 19, 2011

  • Forum Post: Re: mounting hole of TPS5450EVM-254

    JohnTucker
    What holes are you referring to? The PCB does not have mounting holes and teh IC is surface mount...
    on Oct 4, 2011

  • Forum Post: Re: mounting hole of TPS5450EVM-254

    JohnTucker
    they are fiducials. They are just dots used to align the PCB for pick'n'place at the assy fab shop.
    on Oct 4, 2011

  • Forum Post: Re: mounting hole of TPS5450EVM-254

    Anthony Fagnani
    Please find attached the gerbers for the EVM and the Altium PCAD 2004 pcb file for the layout. If you don't have PCAD you can download a viewer from their website. (Please visit the site to view this file) (Please visit the site to view this file) Regards, Anthony
    on Oct 6, 2011

  • Forum Post: Re: LM25085 COT Frequency Independence

    Vijay Choudhary86929
    LM25085 still seems like a good way to go at those current levels to avoid compensation trouble. However as you are changing VOUT very infrequently, it should be possible to go with PWM converters, e.g., LM2678 or TPS5450. Both of them have internal compensation and integrated FET. You may have to test...
    on Nov 22, 2011

  • Forum Post: Re: TPS5450 capacitor at the output side

    JohnTucker
    The TPS5450 is internally compensated. Switcherpro will chose an output capacitor based on that compensation. It will usually require some ESR in the output cap for stability. You can possibly use this method to add some external components to compensate your design: http://www.ti.com/general/docs...
    on Jan 14, 2012

  • Forum Post: Re: TPS5450 capacitor at the output side

    JohnTucker
    Ripple current will be determined by the inductor value. It is typically 20 to 30 % of I out max. When you choose your inductor value, that will be the "Kind" factor in the inductor design equation (EQ 4). Make sure the capacitor you meets teh RMS current requirements of EQ 11. The ESR of the...
    on Jan 18, 2012
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