SWITCHING CIRCUIT WITH SHORT CIRCUIT PROTECTION FUNCTION AND SEMICONDUCTOR RELAY

摘要

PROBLEM TO BE SOLVED: To provide a switching circuit provided with a short circuit protection function and capable of preventing an element from being damaged even when a short circuit state is continued. SOLUTION: An output shunt MOSFET 13 is connected in parallel to an overcurrent detecting resistor 2 connected in series to an output MOSFET 3 through a current shunt ratio adjusting resistor 7, and constituted so as to divert a current allowed to flow into the resistor 2 in a normal state and turns off an overcurrent detecting MOSFET 1 when the MOSFET 1 is turned on to interrupt a current shunt route.