L6219 datasheet by STMicroelectronics

L6219 Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the L6219?
  The maximum operating frequency of the L6219 is 100 kHz, but it can be adjusted up to 500 kHz with an external resistor.
• How do I choose the right inductor value for my application?
  The inductor value depends on the output voltage, input voltage, 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) in the L6219?
  The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage for the internal power MOSFET. It is charged through the internal diode and discharged through the high-side MOSFET during the switching cycle.
• How do I ensure the L6219 is stable and does not oscillate?
  To ensure stability, make sure to follow the recommended PCB layout guidelines, use a stable input voltage, and add a compensation network (e.g., a resistor and capacitor) to the feedback loop if necessary.
• What is the maximum output current of the L6219?
  The maximum output current of the L6219 is 3.5 A, but it can be limited by the external components, such as the inductor and output capacitor, and the thermal design of the PCB.