+5v regulator

[yves]

Are there stability problems with increasing the
15u oscon value to 100u or 470u?
What about a large (say, 47u) cap at the 1k at
the adj node of the 431?

TIA
yv

[ThorstenL]

Koinichiwa,

Originally posted by yves
Are there stability problems with increasing the
15u oscon value to 100u or 470u?
What about a large (say, 47u) cap at the 1k at
the adj node of the 431?

Yes, both can be done. BTW, the 47uF Cap needs to go from Adj to positive side of the reg, not the negative side as it would be for 3-Pin adjustable.

The reason for the specified Os-Con and the omiting the bypass is to match the various (parasitic) resistances to avoid nasty resonances. All Cap's have broadly the same ESR and the Reg has a similar internal impedance.

Sayonara

[Terry Demol]

Originally posted by Elso Kwak


Hi Bricolo,
Organic Semiconductor Capacitor made by Sanyo, not to confuse with "Sayonara"

Hi Elso,

Vishay also make Oscon, haven't tried them though.

http://www.vishay.com/capacitors/aluminum/

See 94 series

Terry

[Andersonix]

Have the recommendations changed in 7 years?

I have similar requirements as the OP: Replace a '7805' 5V 3-pin regulator for a CS4361 DAC (~100mA) in an Oppo 980 DVDP. (And also replace a 7909 and 7809)