![]() ![]() In terms of practical limits, if the output of this supply is shorted, then the current will be limited by the resistance of the internal components (the inductor and diode). Regardless of the resistance of the load, the voltage and current levels will adjust themselves to match that value of power. That energy gets dumped into the load when the switch opens.Ĭonstant energy per cycle × constant number of cycles per second = constant energy per second = constant power. The amount of energy depends only on the input voltage, the inductance and the on-time. ![]() If the switch is operated with a fixed duty cycle (i.e., no feedback), it puts a fixed amount of energy into the inductor each time it is closed. Let's assume it is operating in discontinuous mode and does not have synchronous rectification (i.e., just a diode). Simulate this circuit – Schematic created using CircuitLab Take, for example, an ordinary switchmode boost converter. Yes, it's very easy to construct a constant-power supply. ![]()
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