An RT current generating circuit with clamping

Abstract

The present application belongs to the field of integrated circuit and switching power supply, and particularly relates to an RT current generating circuit with a clamping. RT On this basis, a current proportional to the current I is used to charge a capacitor, and a fixed current is used for comparison, and the voltage at the capacitor is fed back to the gate of an output current mirror, so that the upper and lower limits of the RT current capacitor are set, the size of the RT current is effectively limited, and it is ensured that the oscillator can work in a normal range even in the case that the RT resistance value is extremely high.

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