High-power LED linear constant-current driving control chip

Abstract

The invention relates to the field of microelectronics and in particular to a high-power LED linear constant-current driving control chip comprising a DC bus, a plurality of LED lamp beads in series and parallel relationships, and a plurality of external power tubes, wherein the DC bus is connected to the first end of a first LED lamp bead and the drain of a JFET; the gate of the JFET is grounded;the source of the JFET is connected to the input end of a power splitter; the VDD output end of the power splitter is used as a power supply of other function modules inside the chip; the GV output end of the power splitter is connected to the first end of a thermistor and the gate of the external power tube; and the reference voltage output end of a band-gap reference module is connected to thereference voltage input end of the power splitter and the positive input end of a first operational amplifier. The high-power LED linear constant-current driving control chip improves the reliabilityof the whole system by using dual temperature protection design. A cascode structure composed of the external power MOS transistor and the in-chip internal power adjustment transistor reduces uselesspower consumption and improves the efficiency of the whole system.

Description

Technical field [0001] The invention relates to the field of microelectronics technology, in particular to a high-power LED linear constant current drive control chip. Background technique [0002] LED has ultra-low power consumption and high electro-optical power conversion rate. It can save more than 80% energy than traditional light sources under the same lighting effect, and has a longer service life than traditional light sources. LED light sources can use the principle of red, green and blue primary colors. Under the control, the three colors have 256 gray levels and mixed arbitrarily to form a combination of different light colors. The light color of the LED combination can vary widely, which can achieve colorful dynamic changes and various images. Due to the many advantages of LEDs, LEDs have been widely used and replaced traditional light sources, and the drive design of LED lights has become more and more important. [0003] At present, LED drivers are mainly based on tw...

AI Technical Summary

Problems solved by technology

However, due to the differences in the manufacturing process and packaging process of the MOS tubes, the conduction state between the MOS tubes is inconsistent, and the efficiency of the whole machine is not high.

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