Overview
The TL431BCDRG4 is a precision programmable reference voltage regulator produced by Texas Instruments. It is part of the TL431 and TL432 series, which are three-terminal adjustable shunt regulators known for their thermal stability across various temperature ranges, including automotive, commercial, and military environments. These devices are highly versatile and can be used to set output voltages between approximately 2.5 V and 36 V using two external resistors. The TL431BCDRG4 is particularly noted for its sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
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 36 V | V |
| Operating Temperature Range | −40°C to 125°C | °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 |
| Minimum Cathode Current for Regulation | 0.4 mA to 0.6 mA | mA |
| Off-State Cathode Current | 0.1 µA to 0.5 µA | µA |
| Dynamic Impedance | 0.2 Ω to 0.5 Ω | Ω |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V using two external resistors.
- Thermal Stability: Specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes.
- Low Output Noise: These devices exhibit low output noise, enhancing their performance in various applications.
- Low Output Impedance: Typical output impedance of 0.2 Ω.
- Sink-Current Capability: Capable of sinking 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.
- Onboard Regulation: Excellent for onboard voltage regulation.
- Adjustable Power Supplies: Used in adjustable power supply designs.
- Switching Power Supplies: Suitable for switching power supply applications.
Q & A
- What is the TL431BCDRG4 used for?
The TL431BCDRG4 is used as a precision programmable reference voltage regulator, often replacing Zener diodes in various applications such as onboard regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431BCDRG4?
The output voltage can be set to any value between approximately 2.5 V and 36 V using two external resistors.
- What are the operating temperature ranges for the TL431BCDRG4?
The device operates from −40°C to 125°C.
- What is the typical output impedance of the TL431BCDRG4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BCDRG4?
The device can sink currents from 1 mA to 100 mA.
- What are the reference voltage tolerances for the TL431BCDRG4 at 25°C?
The reference voltage tolerances are 0.5% (B Grade), 1% (A Grade), and 2% (Standard Grade).
- What is the typical temperature drift for the TL431BCDRG4?
The typical temperature drift is 6 mV (C Temp) and 14 mV (I Temp, Q Temp).
- What are some common applications of the TL431BCDRG4?
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 TL431BCDRG4 compare to Zener diodes?
The TL431BCDRG4 has a sharp turn-on characteristic and lower output noise, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431 and TL432 devices?
The devices are offered in three grades: B Grade (0.5% tolerance), A Grade (1% tolerance), and Standard Grade (2% tolerance).
