TL431 datasheet(19/79 Pages) TI

19 / 79 page

∆I

∆V

|z | =

∆I

∆V

|z'| =

|z |

(1 +

(

(2)

The dynamic impedance is defined as:

When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:

which is approximately equal to

TL431, TL431A, TL431B

TL432, TL432A, TL432B

www.ti.com

SLVS543L

– AUGUST 2004 – REVISED FEBRUARY 2011

ELECTRICAL CHARACTERISTICS

over recommended operating conditions, TA = 25°C (unless otherwise noted)

TL431BQ, TL432BQ

PARAMETER

TEST CIRCUIT

TEST CONDITIONS

UNIT

MIN

TYP

MAX

Vref

Reference voltage

Figure 1

VKA = Vref, IKA = 10 mA

2483

2495

2507

Deviation of reference input

VI(dev)

voltage over full temperature

Figure 1

VKA = Vref, IKA = 10 mA

range(1)

Ratio of change in reference

ΔVKA = 10 V − Vref

-1.4

-2.7

ΔVref /

voltage to the change in

Figure 2

IKA = 10 mA

mV/V

ΔVKA

ΔVKA = 36 V − 10 V

-1

-2

cathode voltage

Iref

Reference input current

Figure 2

IKA = 10 mA, R1 = 10 kΩ, R2 = ∞

µA

Deviation of reference input

II(dev)

current over full temperature

Figure 2

IKA = 10 mA, R1 = 10 kΩ, R2 = ∞

0.8

2.5

µA

range(1)

Minimum cathode current for

Imin

Figure 1

VKA = Vref

0.4

0.7

regulation

Ioff

Off-state cathode current

Figure 3

VKA = 36 V, Vref = 0

0.1

0.5

µA

|zKA|

Dynamic impedance(2)

Figure 1

VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA

0.2

0.5

Ω

(1)

The deviation parameters Vref(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over

the rated temperature range. The average full-range temperature coefficient of the reference input voltage

αVref is defined as:

αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature.

Submit Documentation Feedback

Product Folder Link(s): TL431 TL431A TL431B TL432 TL432A TL432B

TL431 Datasheet(PDF) 19 Page - Texas Instruments

TL431 Datasheet(HTML) 19 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

Datasheet Download

Link URL