US 12,451,798 B2
Managing over-current condition in a switching converter
Arnold J D'Souza, Bangalore (IN); and Shyam Somayajula, Bangalore (IN)
Assigned to Shaoxing Yuanfang Semiconductor Co., Ltd., Zhejiang (CN)
Filed by Shaoxing Yuanfang Semiconductor Co., Ltd., Shaoxing (CN)
Filed on Feb. 15, 2023, as Appl. No. 18/169,233.
Claims priority of application No. 202241058831 (IN), filed on Oct. 14, 2022.
Prior Publication US 2024/0128854 A1, Apr. 18, 2024
Int. Cl. H02M 1/32 (2007.01); H02M 1/08 (2006.01); H02M 3/155 (2006.01)
CPC H02M 1/32 (2013.01) [H02M 1/08 (2013.01); H02M 3/155 (2013.01)] 20 Claims
OG exemplary drawing
 
11. A switching converter comprising:
a high-side switch coupled in series with a low-side switch at a node, wherein said high-side switch and said low-side switch are driven in an ON state or an OFF state according to a first internal clock and a second internal clock;
a gate driver operable to provide said first internal clock and said second internal clock based on an external clock having a sequence of cycles, with each cycle having a high level and a low level, duration of said high level being a first magnitude,
wherein said first internal clock, in a normal operation, is at said high level in durations said external clock is at said high level and at said low level in durations said external clock is at said low level such that said high-side switch is in said ON state with duration equaling said first magnitude in said normal operation,
wherein said second internal clock, in said normal operation, is at said low level in durations said external clock is at said high level and at said high level in durations said external clock is at said low level; and
an over-current management block operable to:
check whether a potential over-current condition is present during said normal operation;
in response to a presence of said potential over-current condition, cause said gate driver to increase duration of said high level of said first internal clock to a second magnitude such that said high-side switch is driven in said ON state for duration of said second magnitude; and
examine a magnitude of current through the high-side switch with the ON duration of said second magnitude to determine whether an actual over-current condition is present.