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σ25 and σ26 dual rail supply +/- 92 VDC

sigma25, sigma26, sigma24

σ25 and σ26 dual rail supply +/- 92 VDC

Postby Rinman77 » November 5th, 2019, 1:11 pm

Hi,
I want a regulated dual rail supply at +/- 92VDC. Is it possible to add a Zener diode to the base of the σ78/σ79 in order to up the control voltage?
Thanks,
Ron
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Re: σ25 and σ26 dual rail supply +/- 92 VDC

Postby amb » November 5th, 2019, 11:19 pm

No, that is not advisable. The voltage regulator chips were not designed to be used in this way.

P.S. I deleted your other post in the σ78/σ79 subforum because the question there is redundant to this one.
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Re: σ25 and σ26 dual rail supply +/- 92 VDC

Postby Rinman77 » November 6th, 2019, 9:57 am

Thanks for the response.
Are there then any options for regulation of higher voltage rails?
Ron
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Re: σ25 and σ26 dual rail supply +/- 92 VDC

Postby amb » November 6th, 2019, 12:04 pm

Without doing a parametric search I am not aware of any monolithic IC voltage regulators that could handle that much voltage. You'll probably need to implement a discrete voltage regulator circuit using high voltage parts. Something like a high voltage version of σ22, but it's not trivial to do.
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Re: σ25 and σ26 dual rail supply +/- 92 VDC

Postby amb » November 7th, 2019, 3:36 am

What application is this for anyway? Power amplifier?
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