This circuit is a circuit designed by a colleague before. "LVCC" is a 32V power supply, MC34072 is an operational amplifier, and BZX84C12LT1G is a 12V Zener tube.
I didn't understand the role of op-in-circuit in the circuit;
Please help analyze it.
Thank you.
Katarina Posted on November 3, 2020
Vref = Vz * (R311 + R339) / R311 = 12 * (22 + 7.5) / 22 = 16.09 (V)
Valentino Posted on November 3, 2020
22K above is 12V, then calculate how many V above 7.5K.
Vref=12V+12*7.5/22=16.09V
Vref=12(22+7.5)/22=16.09V
Amos Posted on November 3, 2020
Unstable, the principle phase is different. The first picture shows that the number of correct positive feedback is 0, and the remaining feedback phase is wrong.
Blaise Posted on November 3, 2020
Are there any advantages to this circuit? What are the advantages and disadvantages compared with the benchmark made with TL431?
Does the diode current change with the power supply voltage?
Will the power consumption be lower or the reference voltage will be more stable?