The internal resistance of the current source is large relative to the load impedance, and fluctuations in the load impedance will not change the current. It is meaningless to connect a series resistor in the current source loop because it will not change the load current or the voltage on the load. Such resistors should be simplified on the schematic diagram. The load impedance only makes sense when connected in parallel to the current source, and it is a shunt relationship with the internal resistance.
[Attachment: MAX770 step-up/step-down current source for battery charging]
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New Concept Analog Circuit 1-Transistor [Text Version] (Yang Jianguo)
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