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UCC27284: Can only use high-side of half-bridge driver?
Thank you for your question. Yes, you can use a half-bridge driver such as the UCC27284 as a high-side driver. But, in order to switch the high-side driver, the bootstrap capacitor needs to be charged which is typically handled when the low-side output is on in the typical half-bridge configuration. Because you are not using the low-side drive, the bootstrap capacitor would not get charged and would not have enough charge for use as a high-side driver. You can check out this Link to an article on using a half-bridge driver to perform high-side switching. You would have to switch the low-side output to charge the bootstrap capacitor or you could choose an external circuit such as a charge pump or an isolated floating bias (such as the SN6505 or UCC14240) to keep the bootstrap circuit charged.
