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OVERVOLTAGE_PROTECTION_FOR_LOGIC

2016-09-15 09:09  
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OVERVOLTAGE_PROTECTION_FOR_LOGIC
Zener diode ZD1 senses the supply, and the should the supply rise above 6 V, Q1 will turn on. In turn, Q2 conducts clamping the rail. Subsequent events depend on the source supply. It will either shut down, go into current limit or blow its supply fuse. None of these will damage TTL chips. The rating of Q2 depends on the source supply, and whether it will be required to operate continuously in the event of failure. Its current rating has to be in excess of the source supply.