TL431 Programmable Precision Reference
3
The dynamic impedance ZKA is defined as:
|
ZKA
|
=
∆VKA
∆IK
When the device is programmed with two external resistors, R1 and r2, (refer to Figure 2)
the total dynamic impedance of the circuit is defined as:
| ZKA’| ≈ | ZKA | (1+ R1 )
R2
5
2001-05-A