LED constant-current output drive system based on transistor oscillating circuit
An oscillation circuit, constant current output technology, applied in the field of electronics, can solve the problem of unable to output stable current, and achieve the effect of stabilizing oscillation frequency, improving stability, and stable driving performance
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[0018] like figure 1 As shown, the LED constant current output drive system based on the transistor oscillator circuit of the present invention is mainly composed of a processing chip U, a transistor VT2, a resistor R1, a capacitor C4, a protection circuit, a transistor oscillator circuit, a low-pass filter circuit, a gate drive circuit and The current feedback circuit is composed.
[0019] The low-pass filter circuit is connected in series between the protection circuit and the processing chip U. The resistor R1 is connected in series between the collector of VT2 and the LD pin of the processing chip U. The transistor oscillator circuit is connected in series between the negative electrode of the capacitor C4 and the RI pin of the processing chip U. The gate drive circuit is respectively connected with the GATE pin of the processing chip U and the low-pass filter circuit. The current feedback circuit is connected in series between the gate driving circuit...
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