TLVH431ACLP datasheet(13/54 Pages) TI

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7 Detailed Description

7.1 Overview

TLVH431 is a low power counterpart to TL431, having lower reference voltage (1.24V versus 2.5V) for lower

voltage adjustability and lower minimum cathode current (Ik(min)= 100µA versus 1mA). Like TL431, TLVH431 is

used in conjunction with the key components to behave as a single voltage reference, error amplifier, voltage

clamp or comparator with integrated reference.

TLVH431 is also a higher voltage counterpart to TLV431, with cathode voltage adjustability from 1.24V to 18V,

making this part optimum for a wide range of end equipments in industrial, auto, telecom and computing. For this

device to behave as a shunt regulator or error amplifier, >100µA (Imin(max)) must be supplied in to the cathode

pin. Under this condition, feedback can be applied from the Cathode and Ref pins to create a replica of the

internal reference voltage.

Various reference voltage options can be purchased with initial tolerances (at 25°C) of 0.5%, 1%, and 1.5%.

These reference options are denoted by B (0.5%), A (1.0%) and blank (1.5%) after the TLVH431.

The TLVH431xC devices are characterized for operation from 0°C to 70°C, the TLVH431xI devices are

characterized for operation from –40°C to +85°C, and the TLVH431xQ devices are characterized for operation

from –40°C to +125°C.

7.2 Functional Block Diagram

CATHODE

REF

ANODE

VREF = 1.24 V

−

Figure 7-1. Equivalent Schematic

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TLVH431, TLVH431A, TLVH431B, TLVH432, TLVH432A, TLVH432B

SLVS555N – NOVEMBER 2004 – REVISED JUNE 2024

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TLVH431ACLP 数据表(PDF) 13 Page - Texas Instruments