The maximum voltage rating of the bootstrap capacitor is typically 15V to 20V, but it's recommended to use a capacitor with a voltage rating of at least 25V to ensure reliable operation.
To ensure proper bootstrap capacitor charging, make sure the capacitor is connected between the VB pin and the VCC pin, and that the VCC pin is connected to a stable voltage source. Also, ensure that the capacitor value is within the recommended range (typically 10nF to 100nF) and that the capacitor is rated for high-frequency operation.
The SD (Shutdown) pin is an active-low input that allows the user to shut down the IC when pulled low. To use it, connect the SD pin to a logic low signal (typically 0V) to disable the IC, and connect it to a logic high signal (typically VCC) to enable the IC.
The IR2117S has a built-in dead time generator that ensures a minimum dead time of 540ns between the high-side and low-side switches. However, if you need to adjust the dead time, you can use external resistors and capacitors to modify the dead time. Consult the datasheet and application notes for more information.
To ensure reliable operation and minimize electromagnetic interference (EMI), follow these layout and PCB design guidelines: keep the high-frequency nodes (e.g., the bootstrap capacitor and the high-side switch) away from the low-frequency nodes (e.g., the low-side switch and the output), use a solid ground plane, and use short, wide traces for the high-current paths.
IR2117S datasheet
by International Rectifier
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