TS431 datasheet, PDF - EEWORLD Datasheet

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TS431: DescriptionAdjustable Precision Shunt Regulator; Categorysemiconductor Discrete semiconductor; File Size214KB，8 Pages; ManufacturerTaiwan Semiconductor; Websitehttp://www.taiwansemi.com/

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TS431 Overview

Adjustable Precision Shunt Regulator

TS431 Preview

TS431/431A/431B

Adjustable Precision Shunt Regulator

Sink Current Capability up to 100mA

General Description

The TS431/431A/431B integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC

voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two

external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic

impedance of 0.22Ω. The characteristics of these references make them excellent replacements for zener diodes in many

applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5volt reference makes it convenient to

obtain a stable reference from 5.0volt logic supplies, and since The TS431/431A/431B operates as a shunt regulator, it

can be used as either a positive or negative stage reference.

This series is offered in 3-pin TO-92, SOT-89, SOT-23 and SOP-8 package.

Features

Precision Reference Voltage

TS431

2.495V±2%

TS431A 2.495V±1%

TS431B 2.495V±0.5%

Equivalent Full Range Temp. Coefficient: 50ppm/ C

Programmable Output Voltage up to 36V

Fast Turn-On Response

Sink Current Capability of 1.0 to 100 mA

Low Dynamic Output Impedance: 0.22Ω

Low Output Noise

Standard Application

Ordering Information

Part No.

TS431xCT

TS431xCY

TS431xCX

TS431xCS

Note: Where

denotes voltage tolerance.

Blank: ±2%

A: ±1%

B: ±0.5%

-20 ~ +85 C

Block Diagram

Operating Temp.

(Ambient)

Package

TO-92

SOT-89

SOT-23

SOP-8

Pin Assignment

Pin No.

TS431/A/BCT

TS431/A/BCY

TS431/A/BCX

TS431/A/BCS

2,3,6,7

4,5

Description

Reference

Anode

Cathode

Non connect

TS431/A/B

1-8

2003/12 rev. B

Absolute Maximum Rating

Cathode Voltage (Note 1)

Continuous Cathode Current Range

Reference Input Current Range

Power Dissipation (Note 2, 3)

TO-92

SOT-89 / SOP-8

SOT-23

Operating Junction Temperature Range

Storage Temperature Range

Note 2: Tj Max = 150 C

Note 3: Rating apply to ambient temperature at 25 C

Vka

Iref

-100 ~ +150

-0.05 ~ +10

0.625

0.5

0.3

STG

+125

-65 ~ +150

Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.

Recommend Operating Condition

Cathode Voltage Range

Cathode Current Range (for regulation)

Vka

Ref ~ 36

1 ~ 100

Electrical Characteristics

(Ta=25 C, unless otherwise specified.)

Parameter

Reference

voltage

TS431

TS431A

TS431B

Deviation of reference input

voltage, over temp. (Note 4)

Reference Input current

Radio of change in Vref to

change in cathode Voltage

Deviation of reference input

current, over temp.

Minimum operating cathode

current

Off-state Cathode Current

Dynamic Output Impedance

∆Vref

Ta = full range

Vka =Vref, Ik=10mA (Figure 1)

R1=10KΩ, R2=

∞

, Ika=10mA

(Figure 2)

Ika=10mA, Vka = 10V to Vref,

Vka = 36V to 10V (Figure 2)

Ta= full range

Iref(DEV)

R1=10KΩ, R2=

∞

, Ika=10mA

(Figure 2)

Ika(min)

Ioff

|Zka|

Vka=Vref (Figure 1)

Vref=0V (Figure 3)

f<1KHz, Vka=Vref

Ika=1mA to 100mA (Figure 1)

Vka=36V

0.4

0.22

0.6

1.0

0.5

Ω

0.4

1.2

Vref

Vka =Vref, Ik=10mA (Figure 1)

Symbo

Test Conditions

Min

2.450

2.475

2.487

2.495

Typ

Max

2.550

2.525

2.513

Unit

Iref

∆Vref

∆Vka

0.7

-1.4

- 1.0

4.0

-2.7

- 2.0

mV/V

TS431/A/B

2-8

2003/12 rev. B

Electrical Characteristics (continued)

(Ta=25

C, unless otherwise specified.)

Note 4. Deviation of reference input voltage, VDEV, is defined as the maximum deviation of the reference over the full

temperature range.

The average temperature coefficient of the reference input voltage

αVref

is defined as:

αVref

| = [ V

DEV

/ Vref(25

) ] * 10

/ T2 – T1

…………………….. (PPM/

Where:

T2-T1

= full temperature change.

αVref

can be positive or negative depending on whether the slope is positive or negative.

αVref

| = [ 4mV / 2495mV ] * 10

/ 70

≈

23ppm/

Note 5. The dynamic output impedance, Rz, is defined as:

Example: Maximum Vref=2.496V at 30

C, minimum Vref=2.492V at 0

C, Vref=2.495V at 25

∆T=70

| Zka | =

∆Vka

∆Ika

When the device is programmed with two external resistors R1and R2 (see Figure 2). The dynamic output

impedance of the overall circuit, is defined as :

| Zka | =

∆v

∆i

≈

Zka | * ( 1 + R1 / R2)

Test Circuits

TS431/A/B

3-8

2003/12 rev. B

Application Examples

TS431/A/B

4-8

2003/12 rev. B

Application Examples

TS431/A/B

5-8

2003/12 rev. B

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TS431 Related Products

	TS431	TS431A	TS431B
Description	Adjustable Precision Shunt Regulator	Adjustable Precision Shunt Regulator	Adjustable Precision Shunt Regulator

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