Overview
The TLVH431BQPKG3, produced by Texas Instruments, is a low-voltage adjustable precision shunt regulator. This device is part of the TLVH431 series, which offers enhanced features compared to the TLV431 series. It is designed for applications requiring high precision and stability over a wide range of temperatures.
The TLVH431BQPKG3 operates with a reference voltage (VREF) of 1.24V and can be adjusted to output voltages between 1.24V and 18V using external resistors. This makes it highly versatile for various voltage regulation needs.
This component is particularly useful in isolated feedback circuits for switching-mode power supplies, especially in the 3V to 3.3V range, and is an excellent replacement for low-voltage Zener diodes due to its sharp turn-on characteristic and low output impedance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (VREF) | 1.221 | 1.24 | 1.265 | V |
| Reference Voltage Tolerance at 25°C | - | 0.5% | - | % |
| Temperature Drift | - | 4mV (0°C to 70°C) | 11mV (–40°C to 125°C) | mV |
| Minimum Cathode Current for Regulation | 55 | 100 | - | µA |
| Off-State Cathode Current | 0.001 | - | 0.1 | µA |
| Dynamic Impedance | 0.25 | - | 0.4 | Ω |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- Low-Voltage Operation: Reference voltage of 1.24V, adjustable output voltage from 1.24V to 18V.
- High Precision: Reference voltage tolerances as low as 0.5% at 25°C.
- Low Operational Cathode Current: Typical 80µA, with a minimum of 55µA for regulation.
- Low Output Impedance: Typical 0.25Ω.
- Compact Packaging: Available in SOT-89 and other compact packages, offering a smaller footprint.
- Thermal Stability: Specified thermal stability over industrial and commercial temperature ranges.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on, making it an excellent replacement for low-voltage Zener diodes.
Applications
- Adjustable Voltage and Current Referencing: Suitable for applications requiring precise voltage or current references.
- Secondary Side Regulation in Flyback SMPSs: Ideal for isolated feedback circuits in switching-mode power supplies.
- Zener Replacement: Excellent replacement for low-voltage Zener diodes due to its sharp turn-on characteristic and low output impedance.
- Voltage Monitoring: Can be used in voltage monitoring circuits due to its high precision and stability.
- Comparator with Integrated Reference: Can be configured to operate as a comparator with an integrated reference voltage.
Q & A
- What is the reference voltage of the TLVH431BQPKG3?
The reference voltage (VREF) is 1.24V.
- What is the adjustable output voltage range of the TLVH431BQPKG3?
The output voltage can be adjusted from 1.24V to 18V using external resistors.
- What is the typical operational cathode current of the TLVH431BQPKG3?
The typical operational cathode current is 80µA, with a minimum of 55µA for regulation.
- What is the dynamic impedance of the TLVH431BQPKG3?
The dynamic impedance is typically 0.25Ω.
- What are the common applications of the TLVH431BQPKG3?
Common applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and as a comparator with an integrated reference.
- What is the operating temperature range of the TLVH431BQPKG3?
The operating temperature range is from –40°C to 125°C.
- How does the TLVH431BQPKG3 compare to traditional Zener diodes?
The TLVH431BQPKG3 offers a sharper turn-on characteristic and lower output impedance, making it an excellent replacement for low-voltage Zener diodes.
- Can the TLVH431BQPKG3 be used in isolated feedback circuits?
Yes, it is ideal for isolated feedback circuits in switching-mode power supplies, especially in the 3V to 3.3V range.
- What are the available package options for the TLVH431BQPKG3?
It is available in SOT-89 and other compact packages.
- Does the TLVH431BQPKG3 require an output capacitor for stability?
No, the TLVH431BQPKG3 is internally compensated and does not require an output capacitor for stability.
