Transistor circuit for monitoring switching state of MOSFET installed as low-side switch receives square-wave control signal and includes drive switch, current monitor and evaluation circuit

摘要

A square-wave is fed to the first terminal (IN) of the circuit. The input is fed to a drive switching circuit (10) which is connected to earth (GND) and the source (S) of the MOSFET (T). The drive switching circuit is also connected to a current monitor circuit (20) which in turn is sends a current (Ig) to the gate (G) of the MOSFET. The drive switching circuit also sends a current measurement signal (S1) to the evaluation circuit (30) which produces a transistor state signal (ST). The drain (D) of the MOSFET is connected to a power supply voltage (Vcc) via a load resistor (Last).