MC33063ADE4 datasheet by Texas Instruments

MC33063ADE4 Frequently Asked Questions (FAQs)

• What is the maximum input voltage that can be applied to the MC33063ADE4?
  The maximum input voltage that can be applied to the MC33063ADE4 is 40V, but it's recommended to keep it below 35V for reliable operation.
• How do I ensure the MC33063ADE4 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 output capacitor should be large enough to filter the output voltage ripple.
• What is the purpose of the bootstrap capacitor (CBOOT) in the MC33063ADE4?
  The bootstrap capacitor (CBOOT) is used to generate the gate drive voltage for the internal power MOSFET. It's essential to choose a capacitor with a high voltage rating and low ESR to ensure reliable operation.
• How do I calculate the minimum input capacitance required for the MC33063ADE4?
  The minimum input capacitance can be calculated using the formula: Cin(min) = (Iout x Vout) / (fsw x ΔV). Where Iout is the output current, Vout is the output voltage, fsw is the switching frequency, and ΔV is the input voltage ripple.
• What is the recommended layout and placement for the MC33063ADE4?
  The recommended layout and placement for the MC33063ADE4 involves keeping the power components (inductor, capacitor, and MOSFET) close together, using a solid ground plane, and minimizing the length of the high-current paths. Additionally, the input and output capacitors should be placed close to the IC.