Linear: LM2940 LDO

About switching, if you coud minimize the spikes less than 30mV,
consider yourself a happy man.

best,
guy Vasile

On 6/9/05, Rodrigo Real <rodrigo@freedom.ind.br> wrote:
> 
> Hi guys
> 
> I've been working for some time using the 78XX series as regulators,
> but I was never very satisfied, specially because of the heat
> generation and poor quality of the regulated voltage.
> 
> I am now testing the LM2575/76 series, which seems to performance
> better. It is switched and uses an internal frequency of 50KHz, we can
> see in the output voltage some spikes (the ouput voltage varies in
>  +-10%) in this frequency. I reduced the spikes using an
> inductor/capacitor filter, but I could never eliminate it when I
> have load.
> 
> So, my question is, considering that I will power a PIC and some other
> circuits (mostly discrete) should I be worried with those spikes? I am
> worried if the pic could get lost, or something like it. I also
> control another board, which is a power system for a dc motor, and it
> has a different power supply.
> 
> Do you have any other suggestions of regulators?
> 
> Best regards,
> Rodrigo
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