A classic LM317 constant current source where: I_OUT = V_ADJ/R_S = 1.25 V/R_S

Authors	Stephen Woodward
Main Document	Article «1 A, 20V PWM DAC current source with tracking preregulator»
Description	Figure 1
File Format / Size	PDF / 7 Kb
Document Language	English

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Article «1 A, 20V PWM DAC current source with tracking preregulator»

Figure 1. A classic LM317 constant current source where: I_OUT = V_ADJ/R_S = 1.25 V/R_S
Figure 2. A modification that makes the current source variable where: I_OUT = (V_ADJ - I_CR_C)/R_S - IC
Figure 3. U2 current source programmed by U1 PWM DAC and powered by U3 tracking preregulator

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Microcontrollers