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Current Foldback Voltage Regulator Circuit Design with Op Amp, Darlington BJT Transistors

How to design a voltage regulator with current foldback to limit output current so that Darlington Transistor power consumption remains within the desired limit? Such Regulator circuit design and analysis are discussed in this video. The circuit design targets are: Maximum Darlington BJT Transistor Power Consumption target is 5 Watts, and Output regulated voltage is 10V as long as Darlington Transistor power is less than the maximum allowed. The current foldback feature kicks in otherwise to limit the Regulator output current. For more circuit examples please see    • Electrical Engineering, Analog, Digit...   . This foldback regulator is implemented with one Zener Diode, an Operational Amplifier, a Darlington BJT transistor pair and and NPN Bipolar Junction Transistor as the switch in the current limiter portion of this current foldback voltage regulator. As an example, a 4.7 volt Zener diode from for instance Vishay is selected that similar to Bandgap serves as the reference voltage for this circuit. This stable reference voltage is then scaled up by the Operational Amplifier that is properly biased with negative feedback. The NPN Darlington BJT pair then provides the current to the load RL up to the maximum allowable power consumption. The current limiting high power resistor is selected so that the current foldback feature is activated to properly limit the output current of this regulator. The current foldback voltage-current diagram is shown near the end of this video.