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In setting the dead time length, there is a trade-off: if set too long, the risk of a through-current is reduced, but efficiency is lower. In ROHM ICs, the dead time set in each model is optimized according to differences in the switching rise and fall times for the model. In the case of controller ICs with external switching transistors, the switching rise/fall times must be adjusted so that through-currents do not occur over the entire range of operating conditions.
