Abstract
A novel over-current protection scheme for stepping down DC–DC converter with emulated current mode control is introduced. The proposed over-current protection scheme overcomes an inherent lack of emulated current mode control, and can realise fast response and smooth control to over-current events. The sample–hold technique is employed to generate adaptive reference for predictive current limit threshold. The scheme is verified by simulation and fabricated in 0.18 µm bipolar-CMOS-double-diffused metal-oxide-semiconductor (DMOS) process.
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