US 12,278,558 B2
Power stage adaptive deadtime and drive strength
Chun Cheung, Bridgewater, NJ (US); Ankit Sharma, Raritan, NJ (US); and Bo Wang, Easton, PA (US)
Assigned to Renesas Electronics America Inc., Milpitas, CA (US)
Filed by Renesas Electronics America Inc., Milpitas, CA (US)
Filed on Oct. 13, 2022, as Appl. No. 17/965,206.
Prior Publication US 2024/0128858 A1, Apr. 18, 2024
Int. Cl. H02M 1/38 (2007.01); H02M 1/08 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/385 (2021.05) [H02M 1/08 (2013.01); H02M 3/158 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a controller in a power stage; and
an integrated circuit in the power stage configured to:
initialize a deadtime parameter of the power stage;
adjust a drive strength parameter based on an input voltage being provided to the power stage;
in response to adjusting the drive strength parameter, determine whether to maintain the initialized deadtime parameter or to adjust the initialized deadtime parameter based on at least one of:
a switch node voltage of the power stage, and
an output current of the power stage; and
latch the adjusted drive strength parameter and one of the maintained initialized deadtime parameter and the adjusted initialized deadtime parameter in storage elements;
generate a periodic update signal;
wait for a rising edge of the periodic update signal;
in response to an occurrence of the rising edge of the periodic update signal, output the latched deadtime parameter and the latched drive strength parameter to a controller in the power stage;
the controller in the power stage being configured to:
adjust a deadtime of the power stage using one of the maintained initialized deadtime parameter and the adjusted initialized deadtime parameter latched in the storage elements; and
adjust a drive strength of drivers in the power stage using the adjusted drive strength parameter latched in the storage elements.