BD6222HFP-TR - ROHM Semiconductor

BD6222HFP-TR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  A recommended PCB layout for optimal thermal performance would be to have a large copper area on the bottom layer connected to the thermal pad of the IC, and to use thermal vias to dissipate heat to the top layer. Additionally, keeping the thermal pad away from other components and traces can help reduce thermal resistance.
• How do I ensure stable operation with a high-ESR output capacitor?
  To ensure stable operation with a high-ESR output capacitor, it's recommended to add a small ceramic capacitor (e.g. 1uF) in parallel with the main output capacitor to improve the overall ESR and reduce the risk of oscillation.
• What is the maximum allowed voltage on the EN pin?
  The maximum allowed voltage on the EN pin is 6V, exceeding which may cause damage to the IC. It's recommended to use a voltage divider or a level shifter if the enable signal is coming from a higher voltage domain.
• Can I use a lower value for the bootstrap capacitor (CBST) than recommended?
  While it's technically possible to use a lower value for the bootstrap capacitor (CBST), it's not recommended as it may affect the stability and reliability of the converter. The recommended value is chosen to ensure proper operation and minimize the risk of oscillation.
• How do I calculate the power dissipation of the IC?
  The power dissipation of the IC can be calculated using the formula: Pd = (Vin * Iin) + (Vout * Iout) + (Switching losses). The datasheet provides guidance on how to estimate the switching losses, and the other parameters can be measured or calculated based on the application.