| 摘要 |
A method and circuit for compensating offset errors caused by propagation delays in hysteretic control loops. An overshoot voltage V<SUB>OS</SUB>, caused mainly by an inductor current overshoot, is tracked and held when a switch is to be turned off, and again when the switch actually turns off. A timing logic circuit provides control signals to a sample and hold circuit based on switch signals SW and OUT. A difference between the two sampled voltages is applied to a reference voltage in a hysteretic voltage regulator. By monitoring the overshoot voltage and automatically compensating for it in real-time, a knowledge of a value of the propagation delay is not needed. Thus, significantly improved accuracy may be achieved despite variable factors such as propagation delay variations, temperature changes, component tolerances, and the like.
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