描述 Description

The UTC ULVH431 is a low-voltage 3-terminal programmableshunt regulator with guaranteed thermal stability over full applicable industrial and commercial temperature ranges. The output voltage of UTC ULVH431 can be set to any value between VREF (1.24V) and the corresponding maximum cathodevoltage (18V) with two external resistors. The device operates from a lower voltage (1.24V) than the widely used TL431 and TL1431 shunt-regulator references. The UTC? ULVH431 is an ideal voltage reference in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplieswhen it is used with an opto-coupler. It has a typical output impedance of 0.25?. Active output circuitry supplies a very sharp turn-on characteristic, which makes the UTC ULVH431 very goodsubstitute for low-voltage Zener diode in many applications such as adjustable power supplies and on-board regulation.

特性 Features

Adjustable output voltage, VO=VREF to 18 VLow-Voltage operation: VREF= 1.24 VWide operating cathode current range: 100μA to 50mAReference voltage tolerances at 25°C0.25-? typical output impedance? -40°C ~ 125°C specifications