US 12,074,592 B2
Overcurrent protection circuit
Toru Takuma, Kyoto (JP)
Assigned to ROHM Co., LTD., Kyoto (JP)
Filed by ROHM Co., LTD., Kyoto (JP)
Filed on Jan. 13, 2023, as Appl. No. 18/154,138.
Application 18/154,138 is a continuation of application No. 17/197,312, filed on Mar. 10, 2021, granted, now 11,581,887.
Claims priority of application No. 2020-045498 (JP), filed on Mar. 16, 2020.
Prior Publication US 2023/0170893 A1, Jun. 1, 2023
Int. Cl. H03K 17/082 (2006.01); H02H 9/02 (2006.01); B60R 16/02 (2006.01)
CPC H03K 17/0822 (2013.01) [H02H 9/025 (2013.01); B60R 16/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An overcurrent protection circuit, comprising:
an overcurrent detection section configured to:
detect whether an output current that flows through a switch element is reaching a first overcurrent limit value; and
reduce a rate of rise of the output current, during a transition of the switch element from an OFF state to an ON state, from a first rate of rise to a second rate of rise based on the detection of the output current reaching the first overcurrent limit value, wherein the second rate of rise is lower than the first rate of rise; and
an overcurrent protection section configured to:
reduce an overcurrent limit value for the output current from the first overcurrent limit value to a second overcurrent limit value smaller than the first overcurrent limit value based on the detection of the output current reaching the first overcurrent limit value; and
increase the overcurrent limit value for the output current from the second overcurrent limit value to the first overcurrent limit value based on determination that the output current is less than the second overcurrent limit value for a specific period of time.