A Constant Current Source Driving Circuit Based on Double-loop Negative Feedback
A driving circuit and constant current source technology, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve the problems of small driving current, increasing chip area, raising the VD2 voltage of the drain terminal of PO2 transistors, etc., to achieve reliability. High, simple structure
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[0033] The detailed features and advantages of the present invention are described in detail below in the specific embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the specification, claims and drawings disclosed in this specification , those skilled in the art can easily understand the related objects and advantages of the present invention.
[0034]The invention adds an output voltage feedback network circuit on the basis of the traditional constant current source circuit to realize high-precision LED constant current output that is not affected by the external environment, thereby forming a double-loop negative feedback structure LED constant current source drive circuit. The output voltage feedback network circuit can be realized by a high-gain amplifier or a simple current mirror structure, so it has the advantages of simple str...
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