An on-chip current sensing technique for hysteresis current-controlled boost converters

A novel on-chip current sensing technique suitable for hysteresis-current-controlled (HCC) boost converters is presented. The proposed circuit senses low-side current information and charge/discharge a capacitor to generate the hysteresis band for the current mode controller. The proposed circuit does not need an operational amplifier; thus, it is simple and does not reduce the power efficiency. Simulation results verified the design and showed a good sensing accuracy. The chip is implemented with TSMC 0.25-µm CMOS HV processes.

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