LM317MDT/NOPB datasheet by Texas Instruments

LM317MDT/NOPB Frequently Asked Questions (FAQs)

• What is the maximum input voltage that the LM317MDT/NOPB can handle?
  The maximum input voltage is 40V, but it's recommended to keep it below 35V for reliable operation.
• How do I adjust the output voltage of the LM317MDT/NOPB?
  The output voltage can be adjusted by using a resistive divider network between the output and adjustment pins. The formula to calculate the output voltage is Vout = 1.25 x (1 + R2/R1).
• What is the minimum load current required for the LM317MDT/NOPB to regulate properly?
  The minimum load current required is 3.5mA to ensure proper regulation. If the load current is less than this, an additional resistor can be added to the output to ensure regulation.
• How do I protect the LM317MDT/NOPB from overheating?
  To protect the device from overheating, ensure good thermal design, use a heat sink if necessary, and keep the junction temperature below 125°C. Also, avoid exceeding the maximum power dissipation of 20W.
• Can I use the LM317MDT/NOPB as a negative voltage regulator?
  No, the LM317MDT/NOPB is designed to regulate positive voltages only. For negative voltage regulation, consider using a negative voltage regulator like the LM337.