Overview
The TLV431IDBVRG4 is a low-voltage adjustable precision shunt regulator produced by Texas Instruments. It is part of the TLV431 family, which is known for its low power consumption and versatility in various applications. This device operates with a reference voltage of 1.24V and can be adjusted to output voltages ranging from 1.24V to 6V using external resistors. The TLV431IDBVRG4 is particularly useful in applications requiring low-voltage regulation, such as in isolated feedback circuits for switching-mode power supplies, voltage monitoring, and as a replacement for low-voltage Zener diodes.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Reference Voltage (VREF) at 25°C | 1.224 | 1.24 | 1.259 | V |
| Reference Voltage Deviation over Full Temperature Range | 6 | - | 20 | mV |
| Minimum Cathode Current for Regulation (IK(min)) | 55 | - | 100 | µA |
| Off-State Cathode Current (IK(off)) | 0.001 | - | 0.1 | µA |
| Dynamic Impedance (|zKA|) | 0.25 | - | 0.4 | Ω |
| Reference Terminal Current (Iref) | 0.1 | - | 0.5 | µA |
| Operating Temperature Range | -40 | - | 85 | °C |
Key Features
- Low-voltage operation with a reference voltage of 1.24V.
- Adjustable output voltage from 1.24V to 6V using external resistors.
- High accuracy with reference voltage tolerances of 0.5% for the TLV431B version.
- Low minimum cathode current for regulation (IK(min) = 55µA to 100µA).
- Low off-state cathode current (IK(off) = 0.001µA to 0.1µA).
- Low dynamic impedance (|zKA| = 0.25Ω to 0.4Ω).
- No need for an output capacitor for stability.
- Can be used as a shunt regulator, error amplifier, voltage clamp, or comparator with integrated reference.
Applications
- Secondary side regulation in flyback switching-mode power supplies (SMPSs).
- Voltage monitoring and regulation in industrial, automotive, telecommunications, and computing equipment.
- Replacement for low-voltage Zener diodes.
- Isolated feedback circuits for 3V to 3.3V switching-mode power supplies.
- Error amplifiers and voltage clamps in various power supply designs.
Q & A
- What is the reference voltage of the TLV431IDBVRG4?
The reference voltage (VREF) is 1.24V. - What is the adjustable output voltage range of the TLV431IDBVRG4?
The output voltage can be adjusted from 1.24V to 6V using external resistors. - What is the minimum cathode current required for regulation?
The minimum cathode current (IK(min)) is 55µA to 100µA. - What is the dynamic impedance of the TLV431IDBVRG4?
The dynamic impedance (|zKA|) is 0.25Ω to 0.4Ω. - Does the TLV431IDBVRG4 require an output capacitor for stability?
No, the TLV431IDBVRG4 is internally compensated and does not require an output capacitor for stability. - What are some common applications of the TLV431IDBVRG4?
Common applications include secondary side regulation in flyback SMPSs, voltage monitoring, replacement for low-voltage Zener diodes, and isolated feedback circuits. - What is the operating temperature range of the TLV431IDBVRG4?
The operating temperature range is -40°C to 85°C. - How accurate is the reference voltage of the TLV431B version?
The reference voltage tolerance for the TLV431B version is 0.5% at 25°C. - Can the TLV431IDBVRG4 be used as a comparator?
Yes, the TLV431IDBVRG4 can be used as a comparator with integrated reference. - What is the off-state cathode current of the TLV431IDBVRG4?
The off-state cathode current (IK(off)) is 0.001µA to 0.1µA.
