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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 primary side control LED driver with a novel constant current control mechanism is proposed in this paper. In order to simplify the peripheral circuits, the proposed driver employs two cascaded power MOSFETs to eliminate auxiliary winding. The resonance occurs in the transformer will couple to the connection of power MOSFETs. Thus the system can obtain the demagnetization information by sampling...
A novel kind of chip which is used in high precision and low cost arc detection circuit (leakage detection included) was designed. Based on CSMC's 0.5pm process, the pad is specially designed to produce a specific capacitor. Cascode current mirror and trimming capacitors are used to generate a precise timing signal. High speed, large bandwidth and low offset op-amps with rail to rail output stage...
A linear constant current light-emitting diode (LED) driver without off-chip inductor and capacitor is presented in this paper. The proposed driver consists of one resistor, one diode bridge and one controller integrated circuits (IC). The controller IC employs four LED strings and sequences their conduction to shape the output current in proportion to the input voltage. The controller IC was designed...
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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