Stepper motor regulated DC power supply module component selection

1. D/A converter MAX518

The MAX518 chip produced by Maxim is an 8-bit D/A conversion chip with a two-wire serial interface, a single 5V power supply, and two 8-bit analog output ports. The D/A conversion data of MAX518 is input serially through SOL and SDA. The chip compares the address bits in the input data with the addresses represented by ADO and AD1. If they match, the data is stored in the 8-bit data buffer register, and then outputs 0~5V voltage signals from OUT0 and OUT1 respectively through the D/A conversion circuit and op amp.

2. Voltage regulator circuit LM317

The LM317 three-terminal adjustable integrated voltage regulator is a suspended circuit structure, which not only maintains the simple structure of the three terminals, but also realizes the continuous adjustment of the output voltage. The LM317 is an adjustable positive voltage output regulator, and the LM337 is an adjustable negative voltage output regulator. They have three output terminals: the voltage input terminal VI, the voltage output terminal Vo and the adjustment terminal ADJ. There is no common ground terminal, and the ground terminal is often connected to the ground through a resistor.