Overview
The TL431ACLPM is a precision programmable reference voltage regulator produced by Texas Instruments. It is part of the TL431 series, which are three-terminal adjustable shunt regulators known for their thermal stability across various temperature ranges. These devices are highly versatile and can be used in a wide range of applications, including on-board regulation, adjustable power supplies, and switching power supplies.
The TL431ACLPM offers adjustable output voltage from the reference voltage (approximately 2.5V) up to 36V, using two external resistors. This adjustability, combined with its low output impedance and sharp turn-on characteristic, makes it an excellent replacement for Zener diodes in many circuits.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (Vref) | 2.44 | 2.495 | 2.55 | mV |
| Reference Voltage Tolerance at 25°C | - | 1% (A grade) | - | % |
| Adjustable Output Voltage | Vref | - | 36 | V |
| Cathode Voltage (VKA) | - | - | 37 | V |
| Cathode Current Range | -100 | - | 150 | mA |
| Reference Input Current Range | -0.05 | - | 10 | mA |
| Operating Junction Temperature Range | -40 | - | 125 | °C |
| Typical Output Impedance | - | 0.2 | - | Ω |
| Sink-Current Capability | 1 | - | 100 | mA |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- Thermal Stability: Specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- Low Output Noise: The device features low output noise, making it suitable for 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.
- Low Output Impedance: Typical output impedance of 0.2Ω.
- Sink-Current Capability: Capable of sinking currents from 1 mA to 100 mA.
- Temperature Drift: Low temperature drift, with typical values of 6 mV (C temp) and 14 mV (I temp, Q temp).
Applications
- Rack Server Power: Used in power supply designs for rack servers.
- Industrial AC/DC: Suitable for industrial AC/DC power supplies.
- AC Inverter & VF Drives: Applied in AC inverter and variable frequency drive systems.
- Servo Drive Control Module: Used in servo drive control modules.
- Notebook PC Power Adapter Design: Utilized in power adapter designs for notebook PCs.
- On-Board Regulation: Ideal for on-board voltage regulation.
- Adjustable Power Supplies: Used in adjustable power supply designs.
- Switching Power Supplies: Applied in switching power supply circuits.
Q & A
- What is the TL431ACLPM?
The TL431ACLPM is a precision programmable reference voltage regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431ACLPM?
The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- What are the temperature ranges for the TL431ACLPM?
The device operates from -40°C to 125°C, depending on the specific grade (C, I, Q).
- What is the typical output impedance of the TL431ACLPM?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431ACLPM?
The device can sink currents from 1 mA to 100 mA.
- What are some common applications of the TL431ACLPM?
Common applications include rack server power, industrial AC/DC, AC inverter & VF drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431ACLPM compare to Zener diodes?
The TL431ACLPM has a sharp turn-on characteristic and low output impedance, making it an excellent replacement for Zener diodes in many applications.
- What is the reference voltage tolerance of the TL431ACLPM at 25°C?
The reference voltage tolerance at 25°C is 1% for the A grade.
- What is the maximum cathode voltage for the TL431ACLPM?
The maximum cathode voltage is 37V.
- How does the TL431ACLPM handle temperature drift?
The device has low temperature drift, with typical values of 6 mV (C temp) and 14 mV (I temp, Q temp).
