TL431 datasheet(23/41 Pages) TI

23 / 41 page

TL431, TL431A, TL431B

TL432, TL432A, TL432B

ADJUSTABLE PRECISION SHUNT REGULATORS

SLVS543H − AUGUST 2004 − REVISED JANUARY 2005

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

0.001

0.01

0.1

STABILITY BOUNDARY CONDITIONS†

FOR ALL TL431 AND TL431A DEVICES

(EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES)

100

TA = 25°C

Stable

A VKA = Vref

B VKA = 5 V

C VKA = 10 V

D VKA = 15 Vf

CL − Load Capacitance − µF

150

Ω

IKA

R1 = 10 k

Ω

VBATT

IKA

VBATT

150

Ω

TEST CIRCUIT FOR CURVE A

TEST CIRCUIT FOR CURVES B, C, AND D

−

0.001

0.01

0.1

STABILITY BOUNDARY CONDITIONS†

FOR ALL TL431B, TL432, SOT-23, SC-70, AND Q-TEMP DEVICES

100

Stable

A VKA = Vref

B VKA = 5 V

C VKA = 10 V

D VKA = 15 Vf

CL − Load Capacitance − µF

150

Ω

IKA

R1 = 10 k

Ω

VBATT

IKA

VBATT

150

Ω

TEST CIRCUIT FOR CURVE A

TEST CIRCUIT FOR CURVES B, C, AND D

† The areas under the curves represent conditions that may cause the

device to oscillate. For curves B, C, and D, R2 and V+ were adjusted

to establish the initial VKA and IKA conditions with CL = 0. VBATT and

CL then were adjusted to determine the ranges of stability.

−

TA = 25°C

Stable

Figure 16

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