TL431ACDBVR datasheet(26/83 Pages) TI

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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

• VI(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 Setting

the Shunt Voltage on an Adjustable Shunt Regulator (SLVA445) assists designers in setting the shunt voltage to

achieve optimum accuracy for this device.

10.2.2.2.3 Stability

Though TL43xx is stable with no capacitive load, the device that receives the shunt regulator's output voltage

could present a capacitive load that is within the TL43xx region of stability, shown inFigure 7-16 and Figure 7-18.

Also, designers may use capacitive loads to improve the transient response or for power supply decoupling.

When using additional capacitance between Cathode and Anode, refer to Figure 7-16 and Figure 7-18. Also,

application note Understanding Stability Boundary Conditions Charts in TL431, TL432 Data Sheet (SLVA482)

will provide a deeper understanding of this devices stability characteristics and aid the user in making the right

choices when choosing a load capacitor.

10.2.2.2.4 Start-Up Time

As shown in Figure 10-4, TL43xx has a fast response up to ~2 V and then slowly charges to it's programmed

value. This is due to the compensation capacitance (shown in Figure 9-2) the TL43xx has to meet it's stability

criteria. Despite the secondary delay, TL43xx still has a fast response suitable for many clamp applications.

10.2.2.3 Application Curve

Time (s)

-5E-6

-3E-6

-1E-6

1E-6

3E-6

5E-6

-6

-3

D001

Vsup

Vka=Vref

R1=10k: & R2=10k:

R1=38k: & R2=10k:

Figure 10-4. TL43xx Start-Up Response

TL431, TL432

SLVS543Q – AUGUST 2004 – REVISED JULY 2022

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