IR2151 datasheet by International Rectifier

IR2151 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 18V, but it's recommended to keep it below 15V for reliable operation.
• How do I calculate the bootstrap capacitor value?
  The bootstrap capacitor value depends on the switching frequency, output voltage, and current. A general rule of thumb is to use a capacitor with a value of 10nF to 100nF, but it's recommended to consult the application note AN-978 for a detailed calculation.
• 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 (typically 0V) to shut down the IC, and connect it to a logic high signal (typically VCC) to enable the IC.
• How do I choose the right gate resistor value for my application?
  The gate resistor value depends on the switching frequency, gate capacitance, and desired rise and fall times. A general rule of thumb is to use a resistor value between 10Ω and 100Ω, but it's recommended to consult the application note AN-978 for a detailed calculation.
• What is the maximum current that the IR2151 can handle?
  The IR2151 can handle a maximum current of 1A, but it's recommended to derate the current based on the ambient temperature and PCB layout to ensure reliable operation.