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For instance, if you want to regulate at a 12-V level with a 1-A CC current, then if you draw 650 mA, the CC loop remains silent while the CV takes the leads. If you increase the current and reaches 1 A, then the CC will take the lead, making the output voltage drop as the current increases (the output is the load resistance by the CC current).. Now, if the resistor was 2 ohms instead, the power supply will switch to CC mode, and the voltage will no longer be 5 V while maintaining 1 A current. It will instead be approximately 2 V since 1A x 2 ohms = 2 V. In short, to switch between CV and CC mode, users must configure a current limit at a value in which they want to run CC mode.
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+CV mode can be selected under CC, CR or CP mode. When +CV mode function is turned on and electronic load sinks more current than the maximum current of power supply under test, electronic load will automatically switch to CV mode. It is because that the current sunk is the maximum current of power device.. Some types of rechargeable batteries require mixed mode charge, where the charge starts at constant current and finishes at constant voltage. Li-Ion ones are a good example. So the battery chargers designed for such batteries can have this kind of indication.. There is an excellent presentation on CC-CV by Maria Cortez of Texas Instruments.