Replacing the ADJ terminal-connected diodes with JFETs preserves startup protection for the LM ICs

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Other Materials from the Main Document

• Article «Improve the accuracy of programmable LM317 and LM337-based power sources»
• Figure 1. Two independent current sources, one for loads referenced to the more negative voltage, and the other for those to the more positive one. The I_SUB current sources control the magnitudes of the currents delivered to the loads
• Figure 2. Two independent current regulators. The I_SUB magnitudes are programmable and are often implemented with PWMs. Diodes connected to the ADJ terminals protect the LM ICs during startup. The 0.1-µF supply decoupling capacitors for U1 and U3 a
• Figure 3. Replacing the ADJ terminal-connected diodes with JFETs preserves startup protection for the LM ICs