Overview
The TL431BCPSR, produced by Texas Instruments, is a precision programmable reference voltage regulator. This device is part of the TL431 family, which are three-terminal adjustable shunt regulators known for their thermal stability and versatility across various temperature ranges. The TL431BCPSR is particularly suited for applications requiring adjustable output voltages and high precision voltage references.
Introduced in 1978, the TL431 series has become a standard component in many electronic designs due to its reliability and performance. The TL431BCPSR is compliant with industry standards such as EU RoHS and is available in an 8-pin PDIP package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (Vref) | 2.495 | V |
| Adjustable Output Voltage Range | 2.495 V to 36 V | V |
| Cathode to Anode Voltage (VKA) | 37 | V |
| Cathode Current Range | -100 to +150 | mA |
| Reference Input Current Range | -0.05 to +10 | mA |
| Operating Junction Temperature (TJ) | 150 | °C |
| Operating Ambient Temperature Range (TA) | 0 to +70 | °C |
| Storage Temperature Range (Tstg) | -65 to +150 | °C |
| Total Power Dissipation @ TA = 25°C (PD) | 0.70 (D, LP Suffix), 1.10 (P Suffix), 0.52 (DM Suffix) | W |
| Thermal Resistance, Junction-to-Ambient (RJA) | 178 (D, LP Suffix), 114 (P Suffix), 240 (DM Suffix) | °C/W |
| Thermal Resistance, Junction-to-Case (RJC) | 83 (D, LP Suffix), 41 (P Suffix) | °C/W |
| Output Impedance | 0.2 | Ω |
| Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
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: Operates over a wide temperature range, including -40°C to 125°C, depending on the device grade.
- Low Output Noise: Features low output noise, making it suitable for applications requiring high signal integrity.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- High Precision: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Low Output Impedance: Typical output impedance of 0.2 Ω.
- Sink-Current Capability: Can sink currents from 1 mA to 100 mA.
Applications
- On-Board Regulation: Used in onboard voltage regulation due to its adjustable output voltage and high precision.
- Adjustable Power Supplies: Suitable for adjustable power supplies where the output voltage needs to be precisely controlled.
- Switching Power Supplies: Employed in switching power supplies for its stability and low output noise.
- Automotive, Commercial, and Military: Used in various applications across automotive, commercial, and military sectors due to its wide temperature range and reliability.
Q & A
- What is the TL431BCPSR?
The TL431BCPSR is a precision programmable reference voltage regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BCPSR?
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 TL431BCPSR?
The device operates from 0°C to 70°C, depending on the specific grade (C grade in this case).
- What is the typical output impedance of the TL431BCPSR?
The typical output impedance is 0.2 Ω.
- What are the key applications of the TL431BCPSR?
Key applications include onboard regulation, adjustable power supplies, and switching power supplies.
- How does the TL431BCPSR compare to Zener diodes?
The TL431BCPSR provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431 series?
The TL431 series is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What is the sink-current capability of the TL431BCPSR?
The device can sink currents from 1 mA to 100 mA.
- Is the TL431BCPSR compliant with EU RoHS regulations?
Yes, the TL431BCPSR is compliant with EU RoHS regulations.
- What is the storage temperature range for the TL431BCPSR?
The storage temperature range is -65°C to +150°C.
