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Load-Independent Control of Switching DC-DC Converters With Freewheeling Current Feedback

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5 Author(s)
Young-Jin Woo ; Div. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon ; Hanh-Phuc Le ; Gyu-Ha Cho ; Gyu-Hyeong Cho
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A new control scheme of freewheeling current control is proposed for switching DC-DC converters. The output voltage is regulated by a comparator operation, and in the main current loop, the freewheeling current is feedback-controlled to a reference level in average. The converter control loop is no longer dependent on the values of the inductor, output capacitor, or the load equivalent resistance. The design of a loop compensator is therefore greatly simplified and the loop response can be very fast approaching that of a hysteresis converter. As an example, a single-inductor bipolar-output DC-DC converter with the proposed freewheeling current control is implemented in a 0.5 mum BiCMOS process. The converter has one positive output of 4 V and one negative output of -4.8 V. A maximum efficiency of 81% is achieved at a total output power of 250 mW with a switching frequency of 800 kHz.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:43 ,  Issue: 12 )