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_5V_WITH_PROTECTION_

2016-09-11 12:28  
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_5V_WITH_PROTECTION_
Switching- type short-circuit protection network uses R7 connected to Schmitt trigger Q6-Q7. Ground is provided by Q7 which is normally conducting. ff out-put of regulator is short-circuited, current through Q1 increases; at predetermined limit, a6 conducts and cuts off Q7 breaking ground connection of R7 and thus cutting off Q3 Power transistorQ1 is also cut of, and output current begins to decrease. When load current drops below another predetermined level, Q6 again goes off and Q7 turns on to begin another ON/OFF cycle, with switching process continuing until short-circuit is removed.-H. S, Raina and R. K. Misra, Novel Circuit Provides Short Circuit Protection, EDN Magazine, June 5, 1974, p 84.