Q:

ESD capacitor simulation for human body model

I have designed an ESD suppression circuit with the help of ESD capacitor using LTspice. In the circuit, 15kV input pulse is given to ESD human body model and the resistor, capacitor used near the source are as per the standards.Capacitor C2 value is calculated as per the theory. Now my question is, 
1. i have used a switch before C1. Is this switch needed?
2. Output at C2 is same as C1. C2 does not influence the circuit. 
What should i do to get the correct output?
Plz refer the image for details.
Thanks in advance.

A:

Have you read this article from Texas Instruments ?
To test your ESD protection properly you need to create the correct pulse. This can be done using a circuit like this:

 ESD generator models according to HBM (left) and IEC 61000-4-2 (right)
As you can see the idea behind the Human Body ESD model is that a capacitor is charged to a certain voltage and that charged capacitor is then discharged (through a defined series resistor) through the device under test.
The discharge of the capacitor causes a current to flow and a voltage to develop across your DUT. You need to check if that current and voltage do not exceed the limits of what your DUT (the protection inside it) can handle. At least, that's how I simulate my ESD protections!
Your circuit will only briefly charge the capacitors, it does not simulate the high voltage discharge at all.

