50Hz Powerline Fault Indicators IEC60439 TLVH431AQDBZT Texas Instruments

Features for the TLVH431A

• Low-Voltage Operation: Down to 1.24 V
• 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 18 V
• Wide Operating Cathode Current Range: 100 µA to 70 mA
• 0.25-Ω 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

Description for the TLVH431A

The TLVH431 and TLVH432 devices are low-voltage 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 (1.24 V) and 18 V with two external resistors (see ). These devices operate from a lower voltage (1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.

When used with an optocoupler, the TLVH431 and TLVH432 devices are ideal voltage references in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. They have a typical output impedance of 0.25 Ω. 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.