Programmable voltage stabilizer based on digital potentiometer
A technology of digital potentiometer and voltage stabilizer, which is applied in the direction of instruments, adjusting electric variables, control/regulation systems, etc., and can solve the problems of low adjustment accuracy and inconvenient use
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[0008] The invention includes a digital potentiometer and a three-terminal adjustable linear regulator, and the digital potentiometer is connected in series between R1 and R2.
[0009] In the field of industrial control, it is necessary to provide a high-efficiency, low-voltage output digitally controlled linear regulated power supply that can be precisely adjusted in a small range. Using a low-dropout regulator (LD0) can greatly improve the power conversion efficiency. To save power, the DS1809 is a push-button 64-tap non-volatile digital potentiometer.
[0010] The input end of the voltage stabilizer is connected to a 6V battery, the output voltage Uo=+5~5.5V, and the adjustment range is 0.5V. 0.5V is divided into 64 parts by DS1809, and the step size is 7.8mV; the total resistance value of DS1809 has three specifications, 10kΩ, 50kΩ and 100kΩ, which can be selected. R1 and R2 are voltage divider resistors, which are the same as the output resistance of DS1809. RDCP togethe...
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