Overview
The TL1431IZT, produced by STMicroelectronics, is an adjustable shunt voltage reference known for its guaranteed temperature stability across the entire operating temperature range. This device allows for the output voltage to be set to any value between 2.5 V and 36 V using two external resistors. It operates with a wide current range from 1 to 100 mA and features a typical dynamic impedance of 0.2 Ω, ensuring stable voltage referencing in various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Adjustable Output Voltage | 2.5 V to 36 V | V |
| Sink Current Capability | 1 to 100 mA | mA |
| Typical Output Impedance | 0.22 Ω | Ω |
| Voltage Precision | 0.4% and 0.25% | % |
| Operating Temperature Range | -40 °C to +125 °C | °C |
| Cathode-to-Anode Voltage | 37 V | V |
| Continuous Cathode Current Range | -100 to +150 mA | mA |
| Junction Temperature | +150 °C | °C |
| Power Dissipation (TO92 package) | 625 mW | mW |
Key Features
- Adjustable output voltage from 2.5 V to 36 V using two external resistors.
- Sink current capability from 1 to 100 mA.
- Typical output impedance of 0.22 Ω.
- Voltage precision of 0.4% and 0.25%.
- Guaranteed temperature stability over the automotive temperature range (-40 °C to +125 °C).
- Fast turn-on time (approximately 500 ns).
- Low reference current.
- Internally compensated for stability without an output capacitor.
Applications
- Adjustable voltage and current referencing.
- Secondary side regulation in flyback SMPSs (Switch-Mode Power Supplies).
- Zener replacement.
- Voltage monitoring.
- Comparator with integrated reference.
Q & A
- What is the adjustable output voltage range of the TL1431IZT?
The output voltage can be set to any value between 2.5 V and 36 V using two external resistors.
- What is the sink current capability of the TL1431IZT?
The device can sink current from 1 to 100 mA.
- What is the typical output impedance of the TL1431IZT?
The typical output impedance is 0.22 Ω.
- What is the operating temperature range of the TL1431IZT?
The operating temperature range is -40 °C to +125 °C.
- Does the TL1431IZT require an external capacitor for stability?
No, the TL1431IZT is internally compensated and does not require an external capacitor for stability, although one can be used if desired.
- What are some common applications of the TL1431IZT?
Common applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and as a comparator with an integrated reference.
- What is the junction temperature limit of the TL1431IZT?
The junction temperature limit is +150 °C.
- What is the power dissipation limit for the TO92 package of the TL1431IZT?
The power dissipation limit for the TO92 package is 625 mW.
- How does the TL1431IZT achieve its voltage regulation?
The device achieves voltage regulation through an internal reference and amplifier that outputs a sink current based on the difference between the reference pin and the virtual internal pin.
- Can the TL1431IZT be used in automotive applications?
