Overview
The TLV431AILPR is a low-voltage adjustable precision shunt regulator produced by Texas Instruments. This device is a 3-terminal adjustable voltage reference that operates with a lower voltage than traditional shunt regulators like the TL431. It features a reference voltage of 1.24V and can be adjusted to output voltages between 1.24V and 6V using two external resistors. The TLV431AILPR is ideal for applications requiring low-voltage operation and high precision, making it suitable for industrial, automotive, telecommunications, and computing equipment.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (VREF) | 1.215 | 1.24 | 1.265 | V |
| VREF Deviation over Full Temperature Range | 6 | - | 20 | mV |
| Minimum Cathode Current for Regulation (IK(min)) | 55 | - | 80 | µA |
| Off-State Cathode Current (IK(off)) | 0.001 | - | 0.1 | µA |
| Dynamic Impedance (|zKA|) | 0.25 | - | 0.4 | Ω |
| 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 two external resistors
- High precision with reference voltage tolerances as low as 0.5% (TLV431B)
- Low minimum cathode current for regulation (IK(min) = 55µA to 80µA)
- Low off-state cathode current (IK(off) = 0.001µA to 0.1µA)
- Low dynamic impedance (|zKA| = 0.25Ω to 0.4Ω)
- Internal amplifier and reference, making it suitable for use as a comparator or error amplifier
- No need for an output capacitor for stability, though one can be used if desired
Applications
- Secondary side regulation in flyback switching-mode power supplies (SMPS)
- Zener diode replacement
- Voltage monitoring and regulation
- Comparator with integrated reference
- On-board regulation and adjustable power supplies
- Industrial, automotive, telecommunications, and computing equipment
Q & A
- What is the reference voltage of the TLV431AILPR?
The reference voltage (VREF) of the TLV431AILPR is 1.24V.
- How can the output voltage of the TLV431AILPR be adjusted?
The output voltage can be adjusted between 1.24V and 6V using two external resistors.
- What is the minimum cathode current required for regulation?
The minimum cathode current (IK(min)) required for regulation is between 55µA and 80µA.
- What is the operating temperature range of the TLV431AILPR?
The operating temperature range is from -40°C to 85°C.
- Can the TLV431AILPR be used as a comparator?
- Does the TLV431AILPR require an output capacitor for stability?
No, the TLV431AILPR does not require an output capacitor for stability, though one can be used if desired.
- What are some common applications of the TLV431AILPR?
Common applications include secondary side regulation in SMPS, Zener diode replacement, voltage monitoring, and on-board regulation.
- How does the TLV431AILPR handle temperature variations?
The TLV431AILPR has specified thermal stability over its operating temperature range, with defined deviations for VREF and Iref over the full temperature range.
- What is the dynamic impedance of the TLV431AILPR?
The dynamic impedance (|zKA|) is between 0.25Ω and 0.4Ω.
- Can the TLV431AILPR be used in isolated feedback circuits?
