LM431 datasheet(5/16 Pages) PHILIPS

номер детали	LM431

подробное описание детали	Adjustable precision shunt regulators

PDF	16 Pages

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производитель	PHILIPS [NXP Semiconductors]

домашняя страница	http://www.nxp.com

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Philips Semiconductors

Product specification

TL431C, TL431AC, TL431I,

TL431AI, LM431AC

Adjustable precision shunt regulators

1997 Feb 25

αVREF can be positive or negative depending on whether minimum VREF of maximum VREF, respectively, occurs at the lower temperature.

Example: Max VREF = 2496mV at 30°C, Min VREF = 2492mV at 0°C, VREF = 2495mV at 25°C, DTA = 70°C for TL431C.

REF | +

4mV

2495mV @

106

70oC

+ 23ppm oC

Because minimum VREF occurs at the lower temperature, the coefficient is positive.

4. The dynamic impedance is defined as: |Z

KA | +

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

|Z |

+ DV

DI [

KA |

) R1

PARAMETER MEASUREMENT INFORMATION

INPUT

Vref

VKA

SL01177

Figure 3.

Test Circuit for VKA = Vref

INPUT

Vref

VKA

Iref

KA +

ref

)

) I

ref

SL01178

Figure 4.

Test Circuit for VKA > Vref

INPUT

VKA

Ioff

SL01179

Figure 5.

Test Circuit for IOFF

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