Circuit arrangement for connecting an electronic assembly to an operating voltage

摘要

The connection of the assembly (B) to the operating voltage (+5V) is produced via a start-up device in the form of a switching transistor (T) whose control electrode (GATE) is connected to an auxiliary voltage via a delay element (Rt, Ct). In addition, an electronic protection device is implemented with the aid of a comparator (K), a memory element (storage element) (KST) and a logic element (G) connected downstream from it. This electronic protection device always responds by switching the switching transistor (T) off, whenever an unacceptably high voltage is dropped across the switching transistor, after said switching transistor has completed its start-up phase, as a result of an overcurrent. <IMAGE>