TLVH431 adj referance voltage

168

01:18:55

TLVH431 (or TL431) is a transconductance device. The current gain is enabled when the Op-amp input is above the reference voltage 1.24V (TL431 has 2.5V). 

The need to bias the bandgap reference requires a voltage drop which I show with a Vb-e multiplier, and a 80uA current source. The reference input will not work unless the bandgap has bias. 

These voltage reference circuits are common and I tinker with a fair range of them, so this circuit gets lots of changes. 

published 11 years ago

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