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How should I calculate the lower limit for the capacitance of the bootstrap capacitor of a synchronous rectification DC/DC converter with an upper/lower Nch MOSFET configuration?
Recommended values for the bootstrap capacitor vary with the IC; at ROHM, we use evaluations to confirm operation down to one-half the recommended value. However, thorough checking with actual equipment is ultimately necessary. Please check with the data sheet in each case.