IR2155 datasheet by International Rectifier

IR2155 Frequently Asked Questions (FAQs)

• What is the maximum voltage that can be applied to the VCC pin?
  The maximum voltage that can be applied to the VCC pin is 20V, but it's recommended to keep it below 18V for reliable operation.
• How do I calculate the minimum bootstrap capacitor value?
  The minimum bootstrap capacitor value can be calculated using the formula: CBOOT ≥ (VCC x IPEAK) / (fSW x VBOOT), where IPEAK is the peak current, fSW is the switching frequency, and VBOOT is the bootstrap voltage.
• What is the purpose of the SD pin, and how do I use it?
  The SD (Shutdown) pin is used to disable the IC and reduce power consumption. To use it, connect the SD pin to a logic low signal to shut down the IC, and connect it to a logic high signal or leave it open to enable the IC.
• How do I choose the right gate resistor value for my application?
  The gate resistor value depends on the gate drive current, switching frequency, and power MOSFET characteristics. A good starting point is to use a value between 10Ω to 50Ω, and then adjust it based on the actual circuit performance.
• What is the maximum switching frequency supported by the IR2155?
  The IR2155 can support switching frequencies up to 500 kHz, but the actual frequency limit depends on the specific application, power MOSFET, and layout.