UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Series connected stabilizer valves: questions

turretslug · 17th Mar 2019, 8:28 pm

I think of the TL431 as an extension of the TAA550-type principle, i.e. a very stable low-voltage internal reference with associated circuitry to make it act like an excellent Zener of a different chosen voltage- the TAA550 being fixed at a nominal 33V, the TL431 having a third pin for variability. The latter is so cheap and widely available- not to mention the very low operating current- as to almost displace conventional Zeners for many PSU reference applications, there must be umpteen millions at the heart of SMPSUs worldwide.

17th Mar 2019, 8:28 pm	#25
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,395	Re: Series connected stabilizer valves: questions I think of the TL431 as an extension of the TAA550-type principle, i.e. a very stable low-voltage internal reference with associated circuitry to make it act like an excellent Zener of a different chosen voltage- the TAA550 being fixed at a nominal 33V, the TL431 having a third pin for variability. The latter is so cheap and widely available- not to mention the very low operating current- as to almost displace conventional Zeners for many PSU reference applications, there must be umpteen millions at the heart of SMPSUs worldwide.