MC33063APE4 datasheet by Texas Instruments

MC33063APE4 Frequently Asked Questions (FAQs)

• What is the maximum input voltage that can be applied to the MC33063APE4?
  The maximum input voltage that can be applied to the MC33063APE4 is 40V, but it's recommended to keep it below 35V for reliable operation.
• How do I ensure the MC33063APE4 operates in continuous conduction mode (CCM)?
  To ensure CCM operation, the inductor value should be chosen such that the inductor current ripple is less than 30% of the output current. Additionally, the switching frequency should be set above 50 kHz.
• What is the purpose of the bootstrap capacitor (CBOOT) in the MC33063APE4?
  The bootstrap capacitor (CBOOT) is used to generate the gate drive voltage for the internal power MOSFET. It's essential for proper operation and should be chosen according to the datasheet recommendations.
• How do I calculate the output voltage ripple of the MC33063APE4?
  The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ESL is the inductor's equivalent series inductance, Cout is the output capacitor value, and fsw is the switching frequency.
• What is the recommended layout and thermal management for the MC33063APE4?
  A good layout practice is to keep the high-current paths short and wide, and to use a solid ground plane to reduce EMI. Thermal management is crucial, and the device should be mounted on a heat sink or a PCB with good thermal conductivity.