描述 Description

The TLVH431B-EP device is a low-voltage, 3-terminal, adjustable voltage reference with specified thermal stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF (1.24 V) and 18 V with two external resistors (see Figure 24). This device operates from a lower voltage (1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.

When used with an optocoupler, the TLVH431B-EP device is ideal for voltage references in isolated feedback circuits designed for 3-V to 3.3-V switching-mode power supplies. It has a typical output impedance of 0.25 ?. Active output circuitry provides a very sharp turn-on characteristic, making the TLVH431B-EP device an excellent replacement for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

特性 Features

? Low-voltage operation: down to 1.24 V
? Reference voltage tolerances 0.5% at 25°C
? Adjustable output voltage, VO = VREF to 18 V
? Wide operating cathode current range: 200 μA to 70 mA
? 0.25-? typical output impedance
? Supports defense and aerospace applications:
? Controlled baseline
? Available in extended (–55°C to 125°C) temperature range
? Extended product life cycle
? Extended product-change notification
? Product traceability