Overview
The TL431CDRG4 is a precision programmable reference voltage regulator produced by Texas Instruments. It is part of the TL431 family, which includes 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 TL431CDRG4 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 noise and sharp turn-on characteristic, makes it an excellent replacement for Zener diodes in many circuits.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref to 36V | V |
| Operating Temperature Range | −40°C to 125°C (Q grade) | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2 Ω (typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Cathode Voltage | Up to 37 V | V |
| Reference Input Current | −0.05 to 10 mA | 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: Operates over a wide temperature range with specified thermal stability, making it suitable for automotive, commercial, and military applications.
- Low Output Noise: Features low output noise, enhancing the overall performance of the circuit.
- 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 0.2 Ω.
- Sink-Current Capability: Can sink currents from 1 mA to 100 mA.
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 circuits.
- Switching Power Supplies: Applied in switching power supply designs.
Q & A
- What is the TL431CDRG4?
The TL431CDRG4 is a precision programmable reference voltage regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431CDRG4?
The output voltage can be adjusted from the reference voltage (approximately 2.5V) up to 36V using two external resistors.
- What are the temperature ranges for the TL431CDRG4?
The device operates from −40°C to 125°C (Q grade).
- What is the typical output impedance of the TL431CDRG4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431CDRG4?
The device can sink currents from 1 mA to 100 mA.
- What are some common applications of the TL431CDRG4?
Common applications include rack server power, industrial AC/DC power supplies, AC inverter and variable frequency drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431CDRG4 compare to Zener diodes?
The TL431CDRG4 has a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431CDRG4 based on reference voltage tolerance?
The device is available in three grades: B grade (0.5% tolerance), A grade (1% tolerance), and Standard grade (2% tolerance) at 25°C.
- What is the typical temperature drift of the TL431CDRG4?
The typical temperature drift is 6 mV (C temp) and 14 mV (I temp, Q temp).
- How can I set the output voltage of the TL431CDRG4?
The output voltage can be set using two external resistors connected to the reference and cathode pins.
