Load current monitor for electronically switched load - compares voltage drop across series measuring resistance with voltage drop across reference resistance

摘要

The load current monitor uses a measuring resistance (RS) in series with the MOSFET switching transistor (TS) and the switched load (L) across the voltage source. The voltage drop across the measuring resistance (RS) is compared with the voltage drop across a further resistance (R1), via a current reflection circuit. An output signal is supplied when the voltage drop across the measuring resistance (RS) is greater than the reference value, which can be used for control of the load current (IDS), via the control circuit for the switching transistor (TS). USE - For vehicle electrical appts..