Switching power supply driving chip and switching power supply driving circuit
A switching power supply and driving chip technology, applied in electrical components, adjusting electrical variables, instruments, etc., can solve the problems of many peripheral circuit devices, low working reliability, and large occupied area of the switching power supply driving chip, so as to reduce the board area. The effect of occupying area, improving reliability, and reducing peripheral circuit components
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0026] Aiming at the problems existing in the prior art, the present invention proposes a switching power supply driving chip and a switching power supply driving circuit. The chip uses the quasi-resonance control and valley detection circuit to detect the valley bottom of the transformer in the quasi-resonant state after degaussing. The power supply circuit determines whether to pass through the power tube drain of the chip according to the detected valley bottom and the current voltage value of the power supply pin VDD of the chip. The pin LX supplies power to the power supply pin VDD, and at the...
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