Circuit and procedure for detecting an electric current flow in a MOS-transistor.

摘要

The invention concerns a device for detecting the flow of a current smaller than a given threshold current in a load (L) in series with an MOS power transistor (M1). The free terminal of the MOS transistor is connected to the first terminal (1) of a power supply whose second terminal (2) is connected to the free terminal of the load (L). The gate (G1) of the MOS transistor is connected to a control source (3). A means (11) for detecting a voltage drop is connected to the terminals of the MOS transistor. A feedback loop (12) applies an appropriate gate voltage to the MOS transistor as soon as the voltage drop at its terminals tends to fall below a predetermined level.
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