Overview
The TL431IDRE4, produced by Texas Instruments, is a three-terminal adjustable shunt regulator known for its stable performance across a wide range of temperatures. This device is part of the TL431 family, which is renowned for its thermal stability in automotive, commercial, and military environments. The TL431IDRE4 allows users to set the output voltage to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors. It features active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (Vref) | 2.495 | 2.5 | 2.52 | V |
| Output Voltage Range | Vref | - | 36 | V |
| Reference Voltage Tolerance at 25°C | - | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | - | % |
| Operating Temperature Range | -40 | - | 125 | °C |
| Typical Output Impedance | - | 0.2 | 0.5 | Ω |
| Sink-Current Capability | 1 | - | 100 | mA |
| Total Power Dissipation | - | - | 350 (Tamb ≤ 25 °C), 580 (Tamb ≤ 70 °C), 950 (Tamb ≤ 85 °C) | mW |
| Junction Temperature | - | - | 150 | °C |
Key Features
- Adjustable output voltage from the reference voltage (approximately 2.5V) up to 36V using two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Operation from -40°C to 125°C, ensuring stability across various temperature ranges.
- Typical temperature drift: 6mV for C temperature grade, 14mV for I and Q temperature grades.
- Low output noise and minimal dynamic output impedance (typically 0.2Ω).
- Sink-current capability ranging from 1mA to 100mA.
- Active output circuitry with a sharp turn-on characteristic, making it a suitable replacement for Zener diodes.
Applications
- On-board regulation and voltage monitoring.
- Adjustable power supplies and switching power supplies.
- Comparator with integrated reference in various power supply designs.
- Secondary side regulation in flyback SMPSs.
- Precision voltage regulation and monitoring in applications such as power supplies, battery chargers, consumer electronics, and automotive systems.
Q & A
- What is the TL431IDRE4 used for?
The TL431IDRE4 is used as a three-terminal adjustable shunt regulator, often replacing Zener diodes in applications such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431IDRE4?
The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- What are the reference voltage tolerances for the TL431IDRE4?
The reference voltage tolerances are 0.5% for B grade, 1% for A grade, and 2% for the standard grade at 25°C.
- What is the operating temperature range of the TL431IDRE4?
The device operates from -40°C to 125°C.
- What is the typical output impedance of the TL431IDRE4?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431IDRE4?
The sink-current capability ranges from 1mA to 100mA.
- How does the TL431IDRE4 handle temperature drift?
The device exhibits low temperature drift, with typical values of 6mV for C temperature grade and 14mV for I and Q temperature grades.
- What are some common applications of the TL431IDRE4?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, and precision voltage regulation in various electronic systems.
- How does the TL431IDRE4 compare to Zener diodes?
The TL431IDRE4 has active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What is the total power dissipation of the TL431IDRE4?
The total power dissipation is up to 350mW at Tamb ≤ 25°C, up to 580mW at Tamb ≤ 70°C, and up to 950mW at Tamb ≤ 85°C.
- What is the junction temperature limit of the TL431IDRE4?
The junction temperature limit is 150°C.
