1 Features

? Reference voltage tolerance at 25°C

– 0.5 (B grade)

– 1 (A grade)

– 2 (Standard grade)

? Adjustable output voltage: Vref to 36 V

? Operation from ?40°C to 125°C

? Typical temperature drift (TL43xB)

– 6 mV (C temp)

– 14 mV (I temp, Q temp)

? Low Output Noise

? 0.2-Ω Typical output impedance

? Sink-current capability: 1 mA to 100 mA

2 Applications

? Adjustable voltage and current referencing

? Secondary side regulation in flyback SMPSs

? Zener replacement

? Voltage monitoring

? Comparator with integrated reference

3 Description

The TL431LI / TL432LI are pin-to-pin alternatives

to TL431 / TL432. TL43xLI offers better stability,

lower temperature drift (VI(dev)), and lower

reference current (Iref) for improved system

accuracy.

The TL431 and TL432 devices are three-terminal

adjustable shunt regulators, with specified thermal

stability over applicable automotive, commercial, and

military temperature ranges. The output voltage can

be set to any value between Vref (approximately

2.5 V) and 36 V, with two external resistors.

These devices have a typical output impedance

of 0.2 Ω. Active output circuitry provides a very

sharp turn-on characteristic, making these devices

excellent replacements for Zener diodes in many

applications, such as onboard regulation, adjustable

power supplies, and switching power supplies. The

TL432 device has exactly the same functionality and

electrical specifications as the TL431 device, but has

different pinouts for the DBV, DBZ, and PK packages.

Both the TL431 and TL432 devices are offered in

three grades, with initial tolerances (at 25°C) of

0.5, 1, and 2, for the B, A, and standard

grade, respectively. In addition, low output drift versus

temperature ensures good stability over the entire

temperature range.

The TL43xxC devices are characterized for operation

from 0°C to 70°C, the TL43xxI devices are

characterized for operation from –40°C to 85°C, and

the TL43xxQ devices are characterized for operation

from –40°C to 125°C.

TL431ACDG4屬于集成電路（IC） > 電壓基準(zhǔn)。美國德州儀器公司制造生產(chǎn)的TL431ACDG4電壓基準(zhǔn)產(chǎn)品屬于基準(zhǔn)電壓源系列，可通過相對(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。