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1. (WO2017187785) OVERCURRENT PROTECTION CIRCUIT

Pub. No.:    WO/2017/187785    International Application No.:    PCT/JP2017/008536
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Sat Mar 04 00:59:59 CET 2017
IPC: H02H 3/087
B60R 16/02
H02H 3/093
H02H 7/20
Applicants: ROHM CO., LTD.
ローム株式会社
Inventors: TAKUMA Toru
宅間 徹
TAKAHASHI Naoki
▲高▼橋 直樹
TAKAHASHI Shuntaro
高橋 俊太郎
Title: OVERCURRENT PROTECTION CIRCUIT
Abstract:
In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit 71 has: a threshold value generation unit 130 that, in accordance with a threshold value control signal S170, switches between setting an overcurrent detection threshold value Vth to a first set value (∝Iref) and a second set value (∝Iset) lower than the first set value; an overcurrent detection unit 140 that compares a sense signal Vs in accordance with the current being monitored and the overcurrent detection value Vth, and generates an overcurrent protection signal S71; a reference value generation unit 150 that generates a reference value VIset (∝Iset) in accordance with the seconds set value; a comparison unit 160 that compares the sense signal Vs and the reference value VIset, and generates a comparison signal VCMP; and a threshold value control unit 170 that monitors the comparison signal VCMP, and generates a threshold value control signal S170.