A constant current control method for LED drive input and output low pressure drop
A technology of LED driving and constant current control, applied in energy-saving control technology, electrical components, etc., can solve the problem of increasing current flowing through the lamp bead
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] Such as Figure 1 to Figure 8 As shown, a specific embodiment of the present invention is a constant current control method for LED drive input and output low voltage dropout, including an LED lamp, the LED lamp is electrically connected to a switching power supply drive control chip U1, a MOS turn-on time limiting module and a current detection comparator ; The switching power supply drive control chip U1 detects the current by CS, the MOS turn-on time limit module is provided with a TON limit circuit, and the current detection comparator controls the shutdown of the MOS Q1 by detecting the current in real time and the output stage of the error amplifier EA;
[0032] The constant current control method of LED driver input and output low voltage dropout is as follows:
[0033] a. When the MOS Q1 is turned on, the switching power supply drives the cont...
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