Any switching mechanism (which may have its own set of impedances) must be assumed because nothing is specified. If the discharge is repetitive, the circuit response may differ. ![]() If the supply voltage is very close to the forward voltage drop of the LED, ESR may be an issue, but that would depend on the capacitance of the storage capacitor and supply resistance. A 1 us draw of charge from a charge storage capacitor is nominal, so the storage capacitor will maintain most of its charge after a single cycle. So unless there is a current limiting resistor in series with the LED, the discharge time constant will be mostly determined by the LED forward voltage and the power supply resistance. ![]()
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