US 11,886,264 B2
Load transient detection circuit and method
Ravi Konduru, Bengaluru (IN)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Sep. 8, 2021, as Appl. No. 17/469,620.
Claims priority of provisional application 63/078,660, filed on Sep. 15, 2020.
Prior Publication US 2022/0083112 A1, Mar. 17, 2022
Int. Cl. G06F 1/26 (2006.01); G06F 13/42 (2006.01); H02M 1/00 (2006.01); H02M 3/156 (2006.01); H02M 3/158 (2006.01)
CPC G06F 1/266 (2013.01) [G06F 13/4282 (2013.01); H02M 1/0009 (2021.05); H02M 1/0019 (2021.05); H02M 3/1566 (2021.05); H02M 3/1582 (2013.01); G06F 2213/0042 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A Universal Serial Bus (USB)-Power Delivery (PD) integrated circuit (IC) controller, the USB-PD IC controller comprising:
a driver circuit configured to control operation of a buck-boost converter electrically coupled to a USB voltage bus power line;
a gate driver controller configured to control the driver circuit in a first mode, wherein changes in duty cycle are limited to a predetermined number of cycles in the first mode;
a sense circuit configured to generate a sense signal proportional to current flowing in the USB voltage bus power line; and
an analog detection circuit configured to detect whether a slew rate of the sense signal exceeds a reference slew rate,
wherein the gate driver controller is configured to override the limit placed on the changes in duty cycle in the first mode responsive to the analog detection circuit indicating that the slew rate of the sense signal exceeds the reference slew rate.