CPC G05F 1/571 (2013.01) [G05F 1/59 (2013.01); G05F 3/24 (2013.01)] | 9 Claims |
1. A circuit comprising:
a control sub-circuit including a transistor;
a first transistor having a first control terminal and first and second current terminals;
a second transistor having a second control terminal and third and fourth current terminals, wherein the second control terminal is coupled to the second current terminal;
a third transistor having a third control terminal and fifth and sixth current terminals; and
a fourth transistor having a fourth control terminal and seventh and eighth current terminals, wherein the fourth control terminal is coupled to the fifth current terminal, the seventh current terminal is coupled to the fourth current terminal, and the eighth current terminal is coupled to the sixth current terminal;
a turn-off sub-circuit coupled to the seventh current terminal, wherein the turn-off sub-circuit is configured to turn off the first transistor responsive to an increase in an input voltage; and
a turn-on sub-circuit coupled to the third and fourth control terminals, wherein the turn-on sub-circuit is configured to turn on the first transistor responsive to a decrease in the input voltage.
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