L6569AD datasheet by STMicroelectronics

L6569AD Frequently Asked Questions (FAQs)

• What is the maximum input voltage that the L6569AD can handle?
  The L6569AD can handle input voltages up to 40V, but it's recommended to keep it below 35V for reliable operation.
• How do I choose the right 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 calculation formula provided in the datasheet, and then adjust based on the specific application requirements.
• What is the purpose of the bootstrap capacitor (CBOOT) and how do I choose its value?
  The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage. The recommended value is 10nF to 22nF, but it may need to be adjusted based on the specific application requirements and the value of the high-side MOSFET.
• How do I ensure the L6569AD is stable and doesn't oscillate?
  To ensure stability, make sure to follow the recommended PCB layout guidelines, use a low-ESR output capacitor, and add a small ceramic capacitor (e.g., 10nF) between the VCC pin and GND. Additionally, adjust the compensation components (R1, R2, C1, and C2) according to the application requirements.
• What is the maximum output current that the L6569AD can deliver?
  The L6569AD can deliver up to 3A of output current, but it's recommended to derate the output current based on the ambient temperature and the specific application requirements.