TLVH431B-EP中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

1 Features

? Low-voltage operation: down to 1.24V

? Reference voltage tolerances at 25°C

– 0.5% for B grade

– 1% for A grade

– 1.5% for standard grade

? Adjustable output voltage, VO = VREF to 18V

? Wide operating cathode current range:

100μA to 70mA

? 0.25Ω typical output impedance

? –40°C to +125°C specifications

? TLVH432 provides alternative pinouts for

SOT-23-3 and SOT-89 packages

? Ultra-small SC-70 package offers 40%

smaller footprint than SOT-23-3

2 Applications

? Adjustable voltage reference for data Converters

? Secondary side regulation in flyback SMPSs

? Zener replacement with low leakage current

? Voltage monitoring for power rails

? Comparator with integrated reference

3 Description

The TLVH431 and TLVH432 devices are lowvoltage

3-terminal adjustable voltage references, with

specified thermal stability over applicable industrial

and commercial temperature ranges. Output voltage

can be set to any value between VREF (1.24V)

and 18V with two external resistors (see Figure

6-2). These devices operate from a lower voltage

(1.24V) than the widely used TL431 and TL1431

shunt-regulator references.

When used with an optocoupler, the TLVH431

and TLVH432 devices are an excellent choice for

voltage references in isolated feedback circuits for

3V to 3.3V switching-mode power supplies. The

devices have a typical output impedance of 0.25Ω.

Active output circuitry provides a very sharp turn-on

characteristic, making the TLVH431 and TLVH432

devices excellent replacements for low-voltage Zener

diodes in many applications, including on-board

regulation and adjustable power supplies.

The TLVH432 device is identical to the TLVH431

device, but is offered with different pinouts for the

3-pin SOT-23 and SOT-89 packages.