Patent ID: 6072678
Filing Date: 2000-06-06
Classification: H01L,H02H,H03K

Abstract:
Short-circuit protection circuit for a switching output having a non-self-protected semiconductor switch with a control electrode for receipt of a control voltage from an input terminal of the circuit, the protection circuit comprising a series circuit connecting with the control electrode;wherein the series circuit comprises a timer, a switch-off release stage connecting to an output of the timer, and a switch-off stage connecting between an output of the switch-off release stage and the control electrode of the non-self-protected semiconductor switch;the non-self-protected semiconductor switch is a field effect transistor;the timer comprises a transistor (T1) having an emitter receiving potential of the source electrode of the field-effect transistor;the timer further comprises a series circuit of capacitor (C1) and resistor (R1) wherein a junction of the resistor (R1) and the capacitor (C1) is connected to a base of the transistor (T1), and a terminal of the resistor (R1) opposite the junction connects with the control electrode of the field effect transistor;the timer further comprises a capacitor (C2), a resistor (R2), and a collector of the transistor (T1) connected to the switch-off release stage, the capacitor (C2) connects between the collector of the transistor (T1) and the emitter of the transistor (T1), and the resistor (R2) connects between the collector of the transistor (T1) and an operating voltage.