SLVS543R August 2004 – October 2023 TL431 , TL432
PRODUCTION DATA
The dynamic impedance is defined as . When the device is operating with two external resistors (see Figure 7-13), the total dynamic impedance of the circuit is given by , which is approximately equal to .
The VKA of the device can be affected by the dynamic impedance. The device test current Itest for VKA is specified in the Electrical Characteristics. Any deviation from Itest can cause deviation on the output VKA. Figure 8-4 shows the effect of the dynamic impedance on the VKA.