L78M09CDT datasheet by STMicroelectronics

L78M09CDT Frequently Asked Questions (FAQs)

• What is the maximum input voltage that can be applied to the L78M09CDT?
  The maximum input voltage that can be applied to the L78M09CDT is 35V, although it's recommended to keep it below 30V for reliable operation.
• How do I ensure the L78M09CDT is stable and doesn't oscillate?
  To ensure stability, make sure to use a minimum output capacitance of 2.2uF, and a minimum ESR (Equivalent Series Resistance) of 0.5 ohms. Also, keep the input and output capacitors close to the regulator.
• What is the minimum input voltage required for the L78M09CDT to regulate properly?
  The minimum input voltage required for the L78M09CDT to regulate properly is around 10V, although it's recommended to keep it above 11V for reliable operation.
• Can I use the L78M09CDT in a high-temperature environment?
  The L78M09CDT is rated for operation up to 150°C, but it's recommended to derate the output current and input voltage as the temperature increases to ensure reliable operation.
• How do I protect the L78M09CDT from input voltage transients?
  To protect the L78M09CDT from input voltage transients, use a TVS (Transient Voltage Suppressor) diode or a varistor in parallel with the input capacitor to clamp the voltage.