10.2.2.2.2 Total Accuracy
When programming the output above unity gain (VKA=VREF), TL43xx is susceptible to other errors that may effect
the overall accuracy beyond VREF. These errors include:
• R1 and R2 accuracies
• V
I(dev) - Change in reference voltage over temperature
• ΔVREF / ΔVKA - Change in reference voltage to the change in cathode voltage
• |zKA| - Dynamic impedance, causing a change in cathode voltage with cathode current
Worst case cathode voltage can be determined taking all of the variables in to account. Application note
SLVA445 assists designers in setting the shunt voltage to achieve optimum accuracy for this device.