LM2578AM datasheet by Texas Instruments

LM2578AM Frequently Asked Questions (FAQs)

• What is the maximum input voltage that can be applied to the LM2578AM?
  The maximum input voltage that can be applied to the LM2578AM is 40V, but it's recommended to keep it below 35V for reliable operation.
• Can I use the LM2578AM in a high-temperature environment?
  The LM2578AM is rated for operation up to 125°C, but the maximum junction temperature (TJ) should not exceed 150°C. Ensure proper heat sinking and thermal management to prevent overheating.
• How do I choose the correct inductor value for my application?
  The inductor value depends on the output voltage, output current, and switching frequency. A good starting point is to use the inductor value recommended in the datasheet (e.g., 330uH for the LM2578AM-5.0). You can also use online inductor selection tools or consult with a TI engineer for specific guidance.
• What is the minimum input capacitance required for stable operation?
  The minimum input capacitance required for stable operation is 10uF, but it's recommended to use a higher value (e.g., 22uF) to ensure stable operation and reduce input voltage ripple.
• Can I use the LM2578AM in a low-dropout (LDO) configuration?
  No, the LM2578AM is a switching regulator and not designed for LDO operation. It requires a minimum input-to-output voltage differential (VIN - VOUT) of around 2.5V to maintain regulation.