TLVH431AQDBZT集成电路（IC）的电压基准规格书PDF中文资料

TLVH431AQDBZT属于集成电路（IC）的电压基准。由德州仪器制造生产的TLVH431AQDBZT电压基准产品属于基准电压源系列，可通过相对较不稳定的电源提供稳定的电势，电压值始终保持恒定，以便在测量、控制和类似应用中用作比较的标准。其功能行为可能与用于大功率调节的线性稳压器相似，但基准电压源器件却不适合用于此类用途。用作比较标准时，若输出电流容量或实际负载电流增大，其性能通常会降低。

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.