TL431BCDBVT datasheet(17/85 Pages) TI2

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0.1

1 k

10 k

100 k

1 M

10 M

f − Frequency − Hz

100

IKA = 10 mA

TA = 25°C

Figure 6-12. Reference Impedance vs Frequency

1 kΩ

50 Ω

GND

Output

IKA

−

Figure 6-13. Test Circuit for Reference Impedance

−1

Input

Output

TA = 25°C

t − Time − µs

Figure 6-14. Pulse Response

220 Ω

50 Ω

GND

Output

Pulse

Generator

f = 100 kHz

Figure 6-15. Test Circuit for Pulse Response

0.001

0.01

0.1

100

TA = 25°C

Stable

A V KA = Vref

B VKA = 5 V

C VKA = 10 V

D VKA = 15 Vf

CL − Load Capacitance − µF

The areas under the curves represent conditions that can

cause the device to oscillate. For curves B, C, and D, R2 and

V+ are adjusted to establish the initial VKA and IKA conditions,

with CL = 0. VBATT and CL then are adjusted to determine the

ranges of stability.

Figure 6-16. Stability Boundary Conditions for All

TL431 and TL431A Devices (Except for SOT23-3,

SC-70, and Q-Temp Devices)

150 Ω

IKA

R1 = 10 kΩ

VBATT

IKA

VBATT

150 Ω

TEST CIRCUIT FOR CURVE A

TEST CIRCUIT FOR CURVES B, C, AND D

−

Figure 6-17. Test Circuits for Stability Boundary

Conditions

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TL431, TL432

SLVS543S – AUGUST 2004 – REVISED MAY 2024

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