L7987 datasheet by STMicroelectronics

L7987 Frequently Asked Questions (FAQs)

• What is the maximum input voltage that the L7987 can handle?
  The L7987 can handle input voltages up to 45V, but it's recommended to keep it below 40V for reliable operation.
• How do I choose the right output capacitor for the L7987?
  Choose an output capacitor with a minimum capacitance of 10uF and an ESR (Equivalent Series Resistance) of less than 1 ohm. X5R or X7R ceramic capacitors are recommended.
• What is the minimum input capacitance required for the L7987?
  A minimum input capacitance of 1uF is recommended to ensure stable operation, but a larger capacitance (e.g., 4.7uF) is recommended for high-input-voltage applications.
• Can I use the L7987 in a high-temperature environment?
  The L7987 is rated for operation up to 150°C, but its performance may degrade at high temperatures. Ensure proper thermal design and heat sinking to maintain reliable operation.
• How do I calculate the power dissipation of the L7987?
  Calculate the power dissipation using the formula: Pd = (Vin - Vout) x Iout. Ensure the calculated power dissipation is within the device's rating (typically 1.5W).