TL431, A, B Series

3

MOTOROLA ANALOG IC DEVICE DATA

Ch

i i

Sb l

TL431I

TL431C

Characteristic

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Reference Input Voltage (Figure 1)

Vref

V

VKA = Vref, IK = 10 mA

TA = 25°C

2.44

2.495

2.55

2.44

2.495

2.55

TA = Tlow to Thigh (Note 1)

2.41

–

2.58

2.423

–

2.567

Reference Input Voltage Deviation Over

∆Vref

–

7.0

–

–

3.0

–

mV

Temperature Range (Figure 1, Notes 1, 2)

VKA= Vref, IK = 10 mA

Ratio of Change in Reference Input Voltage

DV

ref

mV/V

to Change in Cathode to Anode Voltage

ref

DV

KA

IK = 10 mA (Figure 2),

DV

KA

∆VKA = 10 V to Vref

–

–1.4

–2.7

–

–1.4

–2.7

∆VKA = 36 V to 10 V

–

–1.0

–2.0

–

–1.0

–2.0

Reference Input Current (Figure 2)

Iref

µA

IK = 10 mA, R1 = 10 k, R2 = ∞

TA = 25°C

–

1.8

4.0

–

1.8

4.0

TA = Tlow to Thigh (Note 1)

–

–

6.5

–

–

5.2

Reference Input Current Deviation Over

∆Iref

–

0.8

2.5

–

0.4

1.2

µA

Temperature Range (Figure 2, Note 1, 4)

IK = 10 mA, R1 = 10 k, R2 = ∞

Minimum Cathode Current For Regulation

Imin

–

0.5

1.0

–

0.5

1.0

mA

VKA = Vref (Figure 1)

Off–State Cathode Current (Figure 3)

Ioff

–

260

1000

–

2.6

1000

nA

VKA = 36 V, Vref = 0 V

Dynamic Impedance (Figure 1, Note 3)

|ZKA|

–

0.22

0.5

–

0.22

0.5

Ω

VKA = Vref, ∆IK = 1.0 mA to 100 mA

f

≤ 1.0 kHz

NOTES: 1. Tlow = –40°C for TL431AIP TL431AILP, TL431IP, TL431ILP, TL431BID, TL431BIP, TL431BILP, TL431AIDM, TL431IDM, TL431BIDM

=0

°C for TL431ACP, TL431ACLP, TL431CP, TL431CLP, TL431CD, TL431ACD, TL431BCD, TL431BCP, TL431BCLP, TL431CDM,

TL431ACDM, TL431BCDM

Thigh= +85°C for TL431AIP, TL431AILP, TL431IP, TL431ILP, TL431BID, TL431BIP, TL431BILP, TL431IDM, TL431AIDM, TL431BIDM

= +70

°C for TL431ACP, TL431ACLP, TL431CP, TL431ACD, TL431BCD, TL431BCP, TL431BCLP, TL431CDM, TL431ACDM, TL431BCDM

2. The deviation parameter

∆Vref is defined as the difference between the maximum and minimum values obtained over the full operating ambient

temperature range that applies.

∆Vref = Vref max

–Vref min

∆TA = T2 – T1

T2

Ambient Temperature

T1

Vref min

Vref max

The average temperature coefficient of the reference input voltage,

αVref is defined as:

V

ref

ppm

_C

+

D V

ref

V

ref

@25

_C

X106

D T

A

+

D V

ref

x106

D T

A

(V

ref

@25

_C)

αVref can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature. (Refer to Figure 6.)

Example :

DV

ref +

8.0 mV and slope is positive,

V

ref

@25

_C + 2.495 V, DT

A +

70

_C

a V

ref +

0.008 x 106

70 (2.495)

+ 45.8 ppm _C

3. The dynamic impedance ZKA is defined as |ZKA| +

D V

KA

D I

K

When the device is programmed with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is defined as:

|Z

KA

|

[ |Z

KA

|

1

) R1

R2