The recommended operating temperature range for TL431ASDT is -40°C to 125°C. However, it's essential to note that the device's accuracy and stability may degrade at extreme temperatures.
To ensure stability, it's crucial to follow proper PCB layout practices, such as keeping the input and output capacitors close to the device, using a low-ESR capacitor for the output, and minimizing the length of the feedback loop. Additionally, a 1-10 nF capacitor between the REF and ADJ pins can help improve stability.
The maximum allowed voltage on the REF pin is 36V. Exceeding this voltage can damage the device. It's essential to ensure that the voltage on the REF pin is within the recommended range to maintain the device's accuracy and reliability.
While the TL431ASDT can be used as a voltage regulator, it's not recommended for high-current applications. The device is primarily designed as a shunt regulator, and its current-handling capability is limited. For high-current applications, a dedicated voltage regulator IC is recommended.
The output voltage of the TL431ASDT can be calculated using the formula: Vout = Vref * (1 + R1/R2), where Vref is the reference voltage (2.495V typical), R1 is the resistance between the OUT and ADJ pins, and R2 is the resistance between the ADJ and GND pins.
TL431ASDT datasheet
by NXP Semiconductors
