LM317 high voltage

[tubbytwo]

I know the max for the ML317 is 37VDC, but is there a way to boost that  to 90VDC at about 30mA? I'm looking for an alternative to four 22V Zeners. The arguement was that IF a Zener shorted, the rest could also go.

 

[indulis]

If you look at the LM317HV spec, you will see that the max input to output voltage is 60V. That does not mean 60V is it!!! You could have 120VDC in and 100V out which is fine because you haven't violated the 60V max differential.

 

[on1aag]

There is a high voltage version of the LM317,  it's the TL783.  ;D

on1aag.

View attachment 39942

 

[Ughadoo]

I'm looking for an alternative to four 22V Zeners. The arguement was that IF a Zener shorted, the rest could also go.

That's not a good argument;

 

[ante1]

Hi tubbytwo,

Just curious, is this a replacement for an old 90V anode battery?