A constant current drive controller and an LED constant current drive circuit. The constant current drive controller comprises a capacitive circuit which is used for outputting a degaussing time detection signal, and a control circuit which is used for sampling and timing the degaussing time detection signal output by the capacitive circuit to obtain a degaussing time and controlling the on-off frequency of an external on-off circuit according to the degaussing time. The LED constant current drive circuit comprises a transformer, an above-mentioned constant current drive controller, an on-off circuit and a rectification filter circuit. The constant current drive controller do not use an auxiliary winding and a voltage division resistor of a transformer, thereby simplifying the structure of a peripheral circuit, improving the integration level of a circuit, reducing costs, reducing the area of a system board and avoiding the problem of low reliability caused by the exposure of a feedback pin.
展开▼
