TL431A [UTC]

PROGRAMMABLE PRECISION REFERENCE; 可编程精密基准


型号：	TL431A
厂家：	Unisonic Technologies
描述：	PROGRAMMABLE PRECISION REFERENCE 可编程精密基准
文件：	总5页 (文件大小：159K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UTC TL431A LINEAR INTEGRATED CIRCUIT

PROGRAMMABLE PRECISION

REFERENCE

DESCRIPTION

The UTC TL431A is a three-terminal adjustable regulator

SOT-89

TO-92

with

guaranteed thermal stability over applicable

temperature ranges. The output voltage may be set to any

value between Vref(approximately 2.5V) and 36V with two

external resistors. It provides very wide applications,

including shunt regulator, series regulator, switching

regulator, voltage reference and others.

FEATURES

*Programmable output Voltage to 36V.

*Low dynamic output impedance 0.2Ω.

SOT-23

SOP-8

*Sink current capability of 1 to 100mA.

*Equivalent full-range temperature coefficient of 50ppm/ °C

typical for operation over full rated operating temperature

range.

SOP-8 1: Cathode

4,5: N.C.

2,3,6,7: Anode 8: Ref.

TO-92 1: Ref ; 2: Anode; 3: Cathode

SOT-89 1: Ref ; 2: Anode; 3: Cathode

SOT-23 1: Cathode; 2: Ref; 3: Anode

*Pb-free plating product number: TL431AK

BLOCK DIAGRAM

CATHODE

REFERENCE

CATHODE

(K)

REFERENCE

(R)

ANODE(A)

2.5V Vref

ANODE

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R103-007,D

UTC TL431A LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATINGS ^{(Operating temperature range applies unless otherwise specified))}

PARAMETER

Cathode Voltage

SYMBOL

VKA

VALUE

UNIT

Cathode Current Range(Continuous)

Reference Input Current Range

Operating Junction Temperature

Operating Ambient Temperature

Storage Temperature Temperature

IKA

Iref

Topr

Tstg

-100 ~ +150

-0.05 ~ +10

150

-40 ~ +85

-65 ~ +150

°C

RECOMMENDED OPERATING CONDITIONS

PARAMETER

Cathode Voltage

Cathode Current

SYMBOL

VKA

MIN

VREF

TYP

MAX

UNIT

IKA

100

ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise specified)

PARAMETER

SYMBOL

Vref

TEST CONDITIONS

MIN TYP MAX UNIT

Reference Input Voltage

VKA=VREF,IKA=10mA

2.483 2.495 2.507

Deviation of reference Input Voltage ∆Vref/∆T

Over temperature(note 1)

VKA=VREF,IKA=10mA

TMIN<=TA<=TMAX

4.5

Ratio of Change in Reference Input

∆VKA=10V~VREF

∆VKA=36V~10V

-1.0

-0.5

-2.7 mV/V

-2.0

Voltage to the Change in Cathode

Voltage

∆Vref /∆VKA IKA=10mA

Reference Input Current

Deviation of Reference Input Current ∆Iref/∆T

Over Full Temperature Range

Minimum Cathode Current for

Regulation

Iref

IKA=10mA,R1=10kΩ, R2=∞

TA=full Temperature

VKA=VREF

1.5

0.4

1.2

µA

IKA(min)

0.45

1.0

Off-State Cathode Current

Dynamic Impedance

IKA(OFF)

ZKA

VKA=36V,VREF=0

VKA=VREF, IKA=1 to 100mA

f≤1.0kHz

0.05

0.15

1.0

0.5

µA

Ω

Note:TMIN=0°C,TMAX=+70°C

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R103-007,D

UTC TL431A LINEAR INTEGRATED CIRCUIT

TYPICAL PERFORMANCE CHARACTERISTICS

Fig 2 Cathode Current Vs Cathode Voltage

Fig 1 Cathode Current Vs Cathode Voltage

800

Ta=25℃

125

100

VKA=VREF

600

400

IKA(min)

200

-25

-50

-75

-100

-2

-200

-1

-2

-1

Cathode Voltage (V)

Fig 3 Change in Reference Input Voltage

Vs Cathode voltage

Fig 4 Pulse Response

Ta=25℃

-5

IKA=100mA

Ta=25℃

-10

-15

-20

-25

-30

-35

-40

Cathode Voltage (V)

Time (µ s)

Fig 5 Dynamic Impedance

Vs Frequency

Fig 6 Small Signal Voltage Amplification Vs Frequency

10²

10¹

Ta=25℃

IKA=10mA

Ta=25℃

I^KA=0mA to 100mA

10⁰

10^-1

-10

10³

10⁴

10⁵

10⁶

10⁷

10³

10⁴

10⁵

10⁶

10⁷

Frequency (Hz)

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R103-007,D

UTC TL431A LINEAR INTEGRATED CIRCUIT

TEST CIRCUIT

VKA

INPUT

VKA

INPUT

KA(OFF)

REF

UTC TL431A

VREF

VKA=VREF*(1+R1/R2)+IREF*R1

Fig 7 Test Circuit For VKA=VREF

Fig 8 Test Circuit for VKA >= VREF

Fig 9 Test Circuit For IKA(OFF)

APPLICATION CIRCUIT

OUT

UTC7805

COMMON

REF

UTC TL431A

Vo=(1+R1/R2)*VREF

Fig 10 Shutdown Regulator

Fig 11 Output Control of a Three

-Terminal Fixed Regulator

Fig 12 Higher-current Shunt Regulator

RCL

UTC TL431A

IO=VREF/RS

RS=VREF/RCL

UTC TL431A

Fig 13 Constant-current Sink

Fig 14 Current Limiting or Current Source

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R103-007,D

UTC TL431A LINEAR INTEGRATED CIRCUIT

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R103-007,D

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