描述 Description

The TL431, A, B 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 V with two external resistors. These devices exhibit a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 W. 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 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the TL431, A, B operates as a shunt regulator, it can be used as either a positive or negative voltage reference.

特性 Features

? Programmable Output Voltage to 36 V
? Voltage Reference Tolerance:+/- 0.4%, Typ @ 25°C (TL431B)
? Low Dynamic Output Impedance, 0.22 W Typical
? Sink Current Capability of 1.0 mA to 100 mA
? Equivalent Full-Range Temperature Coefficient of 50 ppm/ °C Typical
? Temperature Compensated for Operation over Full Rated Operating Temperature Range
? Low Output Noise Voltage
? Pb-Free Packages are Available

簡(jiǎn)介

TL431A屬于集成電路（IC）的電壓基準(zhǔn)。由制造生產(chǎn)的TL431A電壓基準(zhǔn)產(chǎn)品屬于基準(zhǔn)電壓源系列，可通過(guò)相對(duì)較不穩(wěn)定的電源提供穩(wěn)定的電勢(shì)，電壓值始終保持恒定，以便在測(cè)量、控制和類似應(yīng)用中用作比較的標(biāo)準(zhǔn)。其功能行為可能與用于大功率調(diào)節(jié)的線性穩(wěn)壓器相似，但基準(zhǔn)電壓源器件卻不適合用于此類用途。用作比較標(biāo)準(zhǔn)時(shí)，若輸出電流容量或?qū)嶋H負(fù)載電流增大，其性能通常會(huì)降低。