Overview
The TLV431BLPRAG is a precision low-voltage adjustable shunt regulator produced by onsemi. This device is part of the TLV431 series, which is known for its programmable output voltage range of 1.24 V to 16 V. The TLV431B series, specifically, offers a high reference accuracy of ±0.5% at 25°C and ±1.0% over the industrial temperature range of -40°C to 85°C. These regulators are designed to provide a sharp low current turn-on characteristic and a low dynamic impedance, making them excellent replacements for zener diodes in various applications.
Key Specifications
| Characteristic | Symbol | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Reference Voltage | Vref | V | 1.234 | 1.24 | 1.246 |
| Cathode to Anode Voltage | VKA | V | - | - | 18 |
| Cathode Current Range, Continuous | IK | mA | -20 | - | 25 |
| Reference Input Current Range, Continuous | Iref | mA | 0.05 | - | 10 |
| Thermal Resistance, Junction-to-Ambient | RJA | °C/W | 178 | - | - |
| Operating Junction Temperature | TJ | °C | -40 | - | 125 |
Key Features
- Programmable output voltage range of 1.24 V to 16 V
- High reference accuracy: ±0.5% at 25°C and ±1.0% over the industrial temperature range for the TLV431B series
- Sharp low current turn-on characteristic
- Low dynamic impedance of 0.20 Ω over an operating current range of 100 μA to 20 mA
- Available in TO-92, TSOP-5, and SOT-23-3 packages
- Pb-free package options available
- Internally compensated for stability without an output capacitor
Applications
- Adjustable voltage and current referencing in linear and switching power supplies
- Secondary side regulation in flyback switching-mode power supplies (SMPSs)
- Zener diode replacements in various circuits requiring precise reference voltages
- Voltage monitoring and comparator circuits
- Analog and digital circuits requiring precision references
- Low output voltage (3.0 V to 3.3 V) switching power supply error amplifiers
- Smart phone chargers and adapters
Q & A
- What is the reference voltage range of the TLV431BLPRAG?
The reference voltage range is 1.24 V to 16 V.
- What is the reference accuracy of the TLV431B series at 25°C?
The reference accuracy is ±0.5% at 25°C.
- What is the operating current range of the TLV431BLPRAG?
The operating current range is from 100 μA to 20 mA.
- What are the typical package options for the TLV431BLPRAG?
The device is available in TO-92, TSOP-5, and SOT-23-3 packages.
- Does the TLV431BLPRAG require an output capacitor for stability?
No, the device is internally compensated and does not require an output capacitor for stability.
- What are some common applications of the TLV431BLPRAG?
Common applications include adjustable voltage and current referencing, zener diode replacements, voltage monitoring, and error amplifiers in switching power supplies.
- What is the thermal resistance of the TLV431BLPRAG in a TO-92 package?
The thermal resistance (RJA) is approximately 178 °C/W.
- Is the TLV431BLPRAG suitable for high-temperature environments?
Yes, it operates over an industrial temperature range of -40°C to 125°C.
- Can the TLV431BLPRAG be used in isolated feedback circuits?
Yes, when combined with an optocoupler, it can be used as an error amplifier in isolated feedback circuits for low output voltage switching power supplies.
- What is the dynamic impedance of the TLV431BLPRAG?
The dynamic impedance is 0.20 Ω over the operating current range.
