Patent ID: 11942866
Assignee: CYPRESS SEMICONDUCTOR CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 18:
19. A method of operating an error amplifier that comprises an output pin coupled to a pulse width modulation (PWM) comparator of a buck-boost converter, a first transconductance amplifier that operates in a constant voltage mode, a second transconductance amplifier that operates in a constant current mode, wherein the method of operating the error amplifier comprises:
receiving, at a first positive input of the first transconductance amplifier, a first voltage reference;
receiving, at a first negative input of the first transconductance amplifier, a voltage from a tap point of a voltage divider coupled between a voltage bus and a ground of the buck-boost converter;
adjusting, at the output pin, an output current based on a voltage difference between the first positive input and the first negative input;
receiving, at a second positive input of the second transconductance amplifier, a second voltage reference;
receiving, at a second negative input of the second transconductance amplifier, a voltage of a current sense amplifier, the current sense amplifier being coupled to a sense resistor positioned inline along the voltage bus; and
adjusting, at the output pin, the output current based on a voltage difference between the second positive input and the second negative input.