公开(公告)号：US20180234063A1

公开(公告)日：2018-08-16

申请号：US15887657

申请日：2018-02-02

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric J. KING ,  Emmanuel MARCHAIS

IPC: H03G3/00 ,  H02M3/07 ,  H03F1/02

Abstract: A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage, a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, and a controller configured to, in a current-limiting mode of the controller, control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit, control the power amplifier by placing the power amplifier into a high-impedance mode during the current-limiting mode, and control state variables of a loop filter of the current mode control loop during the current-limiting mode.