IR2101S datasheet by International Rectifier

IR2101S Frequently Asked Questions (FAQs)

• What is the maximum voltage rating of the bootstrap capacitor?
  The maximum voltage rating of the bootstrap capacitor should be at least 2x the maximum voltage of the VCC supply, typically 15V to 20V.
• How do I ensure proper bootstrap capacitor selection?
  Select a bootstrap capacitor with a voltage rating as mentioned above, and a capacitance value between 100nF to 1uF. The capacitor should also have a low ESR (Equivalent Series Resistance) to minimize voltage drops.
• What is the purpose of the SD pin, and how do I use it?
  The SD (Shutdown) pin is an active-low input that disables the IC when pulled low. It can be used to shut down the IC during power-up or power-down sequences, or to implement a fault protection mechanism. Connect the SD pin to a logic low signal to disable the IC.
• How do I handle the dead time between the high-side and low-side switches?
  The IR2101S has a built-in dead time generator that ensures a minimum dead time of 100ns between the high-side and low-side switches. However, you can adjust the dead time by adding an external resistor and capacitor between the DT (Dead Time) pin and ground.
• What is the recommended layout and routing for the IR2101S?
  Keep the high-frequency switching nodes (e.g., VCC, VIN, and bootstrap capacitor) away from sensitive analog nodes. Use a solid ground plane, and route the high-current paths (e.g., VCC and VIN) with wide, low-impedance traces. Minimize the loop area of the high-frequency current paths to reduce EMI.