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A front-end circuit with 16-channel 12-bit 100-kSps RC-hybrid successive approximation register (SAR) analog-to-digital converter (ADC) for industrial monitoring application is presented. The front-end circuit can process a wide range input voltage as large as 10 V which is beyond the supply voltage, with the help of voltage divider preceding an analog multiplexer. A programmable gain amplifier (PGA)...
A constant average output current flyback LED driver without auxiliary windings, opto-couplers or output voltage feedback resistors is proposed. A novel on-chip feedback method through parasitic capacitor of the power MOS to detect demagnetizing time of the magnetizing inductor is used in the driver. The proposed scheme reduces the cost and improves the compaction of flyback LED drivers. The driver...
This paper presents a linear constant current LED driver with no off-chip inductor or capacitor. The proposed circuit consists of a main controller and constant current sources to drive the LED array. An improved control method is used for lighting the LED array step by step, shaping the output current in proportion to the input voltage. Each constant current source has functions of temperature compensation...
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