TL431BQLPR datasheet(16/77 Pages) TI1

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150 Ω

IKA

R1 = 10 kΩ

VBATT

IKA

VBATT

150 Ω

TEST CIRCUIT FOR CURVE A

TEST CIRCUIT FOR CURVES B, C, AND D

−

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

−1

Input

Output

TA = 25°C

t − Time − µs

220 Ω

50 Ω

GND

Output

Pulse

Generator

f = 100 kHz

0.1

1 k

10 k

100 k

1 M

10 M

f − Frequency − Hz

100

IKA = 10 mA

TA = 25°C

1 kΩ

50 Ω

GND

Output

IKA

−

TL431, TL431A, TL431B

TL432, TL432A, TL432B

SLVS543O – AUGUST 2004 – REVISED JANUARY 2015

www.ti.com

Typical Characteristics (continued)

Figure 13. Test Circuit for Reference Impedance

Figure 12. Reference Impedance vs Frequency

Figure 15. Test Circuit for Pulse Response

Figure 14. Pulse Response

The areas under the curves represent conditions that may 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 16. Stability Boundary Conditions for All TL431 and

TL431A Devices

Figure 17. Test Circuits for Stability Boundary Conditions

(Except for SOT23-3, SC-70, and Q-Temp Devices)

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Product Folder Links: TL431 TL431A TL431B TL432 TL432A TL432B

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