The maximum voltage rating of the bootstrap capacitor should be at least 2x the maximum voltage of the high-side supply (VCC) plus the maximum voltage of the low-side supply (VIN). Typically, a 50V or 63V rated capacitor is recommended.
To ensure proper bootstrap capacitor charging, make sure the high-side FET is turned off before the low-side FET is turned on, and vice versa. This can be achieved by introducing a dead time between the high-side and low-side gate signals.
The recommended value of the bootstrap capacitor is typically in the range of 10nF to 100nF. A larger value can provide more energy storage, but may also increase the turn-on time of the high-side FET.
The UVLO feature is designed to prevent the driver from operating when the VCC supply voltage is too low. To handle UVLO, ensure that the VCC supply voltage is above the UVLO threshold (typically 10.5V) before enabling the driver. You can also use an external voltage monitor or supervisor IC to reset the system if the VCC supply voltage falls below the UVLO threshold.
The maximum frequency of operation for the IR2103S is typically limited by the switching frequency of the FETs and the propagation delay of the driver. The datasheet recommends a maximum frequency of 500kHz, but this can be extended to 1MHz or higher with proper design and layout considerations.
IR2103S datasheet
by International Rectifier
