LF33 - prekmit napajeni?

Marek Sembol hwm.land na gmail.com
Pátek Únor 21 11:05:03 CET 2014


Jj, proto je pak tak super, kdyz clovek nakoupi u prodejce, kt. to
nerozlisuje:)
Takze jen pro poradek ja citoval z DS od National Semiconductor datovany
unor 1999 (takovy se mi vali na disku)
V DS od LT1117 (Linear Technology (presnejsi urceni ani rok tam neni) taky
pisou "max 0.5 ohm".

Marek


On Fri, Feb 21, 2014 at 10:48 AM, Jan Waclawek <konfera na efton.sk> wrote:

> Neviem, ktory LM1117 presne pozerate, ale v
>
> http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=lm1117-n&fileType=pdf
> sa pise:
>
>  The ESR of the output capacitor should range between 0.3 OHM - 22 OHM.
>
> Takze pozor na to, aj xx1117 je "jak ktery".
>
> wek
>
>
> ----- Original Message ---------------
>
> Subject: Re: LF33 - prekmit napajeni?
>    From: Marek Sembol <hwm.land na gmail.com>
>    Date: Fri, 21 Feb 2014 10:34:50 +0100
>      To: HW-news <hw-list na list.hw.cz>
>
> >No ja hned letel koukat do DS od LM1117, kterou mam pouzitou na nekolika
> >mistech a tam ohledne vystupniho kondenzatoru pisou:
> ><citat>
> >The output capacitor is critical in maintaining regulator stability,
> >and must meet the required conditions for both minimum
> >amount of capacitance and ESR (Equivalent Series Resistance).
> >The minimum output capacitance required by the
> >LM1117 is 10µF, if a tantalum capacitor is used. Any increase
> >of the output capacitance will merely improve the loop stability
> >and transient response. The ESR of the output capacitor
> >should be less than 0.5ohm. In the case of the adjustable regulator,
> >when the CADJ is used, a larger output capacitance
> >(22µf tantalum) is required.
> ></citat>
> >, takze je tam jen maximalni hodnota, ze by mela mensi hodnota ESR vadit
> >nezminuji.
> >
> >Takze i s temi LDO je to asi "jak-ktery". Teda doufam, ze 1117 mohu
> pocitat
> >mezi LDO...
> >Marek
> >
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