TL431-Q1

ADJUSTABLE PRECISION SHUNT REGULATOR

SGLS302C − MARCH 2005 − REVISED APRIL 2008

7

POST OFFICE BOX 655303

‡ Data is for devices having the indicated value of Vref at IKA = 10 mA,

TA = 25°C.

Figure 5

2500

2480

2420

2400

−75

−50

−25

0

25

50

75

2540

2580

REFERENCE VOLTAGE

vs

FREE-AIR TEMPERATURE

2600

100

125

2460

2560

2520

2440

TA − Free-Air Temperature − °C

Vref = 2495 mV‡

Vref = 2440 mV‡

VKA = Vref

IKA = 10 mA

Vref = 2550 mV‡

3

2

1

0

−75

−25

0

50

4

REFERENCE CURRENT

vs

FREE-AIR TEMPERATURE

5

100

125

−50

25

75

TA − Free-Air Temperature − °C

R1 = 10 k

Ω

R2 =

∞

IKA = 10 mA

Figure 6

Figure 7

25

0

−50

−75

−100

125

−25

−2

−1

0

1

75

50

100

CATHODE CURRENT

vs

CATHODE VOLTAGE

150

23

VKA − Cathode Voltage − V

VKA = Vref

TA = 25°C

Figure 8

400

200

0

−200

−1

0

1

600

CATHODE CURRENT

vs

CATHODE VOLTAGE

800

23

VKA = Vref

TA = 25°C

VKA − Cathode Voltage − V

Imin

† Data at high and low temperatures is applicable only within the recommended operating free-air temperature ranges of the various devices.