Large current linear divider circuit composed of LM317 and LM358 - Power Circuit - Circuit Diagram

According to the internal circuit structure and working principle of the LM317, the output voltage of the voltage regulator circuit can be written as

Because the LM317 has excellent regulation performance (current regulation is about 0.3%), the load loop current I'0 is allowed to vary from zero to the maximum output current of the LM317. The common LM317's maximum output current ranges from 100mA to several amps (depending on the specific model of the LM317).
In summary, this design not only eliminates the nonlinearity of the load characteristics of the voltage divider, but also solves the problem of weak load capacity of the voltage divider.
In the figure, capacitors C1 and C0 are the input and output capacitors of the regulator circuit; diodes D1 and D2 are protection diodes of LM317; capacitor C is used to filter out ripple and interference in the voltage follower output voltage.
Tests show that the circuit makes full use of the advantages of integrated three-terminal regulator with good regulation performance and large output current. The maximum nonlinear error when outputting 50mA current is only 0.4% (using LM317T) and 0.7% (using LM317L). High current linear voltage divider has good performance.