Overview
The TL431ACDR2, produced by onsemi, is a programmable precision reference voltage regulator. This device is part of the TL431 series, known for its adjustable output voltage and high thermal stability. It is a three-terminal adjustable shunt regulator, making it versatile for various applications requiring stable reference voltages.
The TL431ACDR2 is particularly useful in replacing Zener diodes in many circuits due to its sharp turn-on characteristic and low dynamic output impedance. It operates over a wide temperature range and is suitable for automotive, commercial, and military applications.
Key Specifications
| Characteristic | Symbol | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Cathode to Anode Voltage | VKA | V | - | - | 37 |
| Cathode Current Range, Continuous | IK | mA | -100 | - | 150 |
| Reference Input Current Range, Continuous | Iref | mA | -0.05 | - | 10 |
| Operating Junction Temperature | TJ | °C | - | - | 150 |
| Operating Ambient Temperature Range | TA | °C | -40 | - | 125 |
| Reference Input Voltage (at 25°C) | Vref | V | 2.44 | 2.495 | 2.55 |
| Dynamic Impedance (at 25°C, f ≤ 1 kHz) | |ZKA| | Ω | 0.22 | - | 0.5 |
Key Features
- Programmable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V using two external resistors.
- Low Dynamic Output Impedance: Typical dynamic impedance of 0.22 Ω, making it suitable for applications requiring stable voltage references.
- Sink Current Capability: Can sink currents from 1 mA to 100 mA, providing flexibility in various circuit designs.
- Thermal Stability: Operates over a wide temperature range from -40°C to 125°C, ensuring stable performance in diverse environments.
- Low Output Noise: Features low output noise, which is beneficial in noise-sensitive applications.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes).
Applications
- Digital Voltmeters: Used as a stable reference voltage source in digital voltmeters).
- Power Supplies: Utilized in adjustable power supplies and switching power supplies for on-board regulation).
- Op Amp Circuitry: Employed in operational amplifier circuits requiring stable reference voltages).
- Rack Server Power: Used in rack server power supplies and industrial AC/DC power systems).
- AC Inverter & VF Drives: Applied in AC inverter and variable frequency drive systems).
- Notebook PC Power Adapters: Incorporated in notebook PC power adapter designs for stable voltage regulation).
Q & A
- What is the typical dynamic impedance of the TL431ACDR2?
The typical dynamic impedance is 0.22 Ω).
- What is the operating temperature range of the TL431ACDR2?
The operating temperature range is from -40°C to 125°C).
- What is the maximum cathode to anode voltage for the TL431ACDR2?
The maximum cathode to anode voltage is 37 V).
- Can the TL431ACDR2 replace Zener diodes in circuits?
Yes, it can replace Zener diodes due to its sharp turn-on characteristic and low dynamic output impedance).
- What is the range of the sink current capability of the TL431ACDR2?
The sink current capability ranges from 1 mA to 100 mA).
- How is the output voltage of the TL431ACDR2 programmed?
The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V using two external resistors).
- What are some common applications of the TL431ACDR2?
Common applications include digital voltmeters, power supplies, op amp circuitry, rack server power, AC inverter & VF drives, and notebook PC power adapters).
- What is the reference input voltage tolerance at 25°C for the TL431AC grade?
The reference input voltage tolerance at 25°C for the TL431AC grade is ±0.5%).
- What is the maximum operating junction temperature of the TL431ACDR2?
The maximum operating junction temperature is 150°C).
- Does the TL431ACDR2 have low output noise?
Yes, the TL431ACDR2 features low output noise, which is beneficial in noise-sensitive applications).
