高精度可编程恒流驱动白光LED芯片设计研究

Abstract

Abstract:

An accurate programmable constant current driver for the white light LED is designed. An autozero amplifier, based on the autozero technique, is constructed in the chip. The current delivered to the LED load is controlled by the external resistor and the enable pins. Three discrete constant current settings are available and may be selected at the supply voltage from 2.9 V to 4.4 V, which is up to 1 A. Measurement results show that the variation in the ratio of the external resistor current to the LED load current is less than 2.3％, when the LED load current changes from 200 mA to 800 mA. The driving current of 800 mA varies by less than 0.46％ when the supply voltage changes by ±10％.

Key words: amplifier, light emitting diode, constant-current driving, autozeroing

CLC Number:

TN432

LI Xian-rui1;LAI Xin-quan1;WANG Song-lin2;LI Yu-shan1. Design research on the high-precision programming constant current driver of the white light LED[J].J4, 2009, 36(3): 433-437.

References

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Design research on the high-precision programming constant current driver of the white light LED

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