Rooting around in the fascinating stuff at the bottom of a draw labelled 'Engineering - Junk Miscellaneous'. Delving amongst the delightful...
Wall chargers and ceramic caps team up to ruin your circuit
Danger comes from the wonderful low resistance and inductance of these capacitors, which allows the capacitance to resonate at high frequency with power lead inductance.
If a voltage step is applied – for example when plugging an already-energised wall adapter into the circuit – a spike can be generated with far more amplitude than the voltage applied, and with enough energy to take out parts of the decoupled circuit.
Moving to a capacitor with a higher ESR, or adding a resistor of a fraction of an ohm in series with the input, is the answer.Tags: amplitude, application note, capacitors, decoupling, impedance