This is with regard to a series of my ESD and Inrush Related questions.
My circuit :
The Node A goes to two other circuits like below :
Now, I apply an ESD pulse of say 8kV/330pF, the capacitors C0001, C0002, C0003 and C0004 have the ability to clamp down the voltage to a certain amount.
But now, I need to ensure that whether that voltage does not exceed the maximum ratings of downstream devices like D0004 and MOSFET Q0001 and other components which are connected to NODE A.
In the D0004 Zener 6.2V rated datasheet, only the absolute maximum ratings are provided for Power Dissipation. There is no maximum rating which indicates the maximum voltage that the zener diode can handle. How to deal with this case?
The same I see for MOSFET BSP317P. Only Max Vds. So, I can take that the maximum voltage that the source terminal can handle is 250V with respect to the drain. If the output voltage is 25V, the MOSFET source terminal can handle a maximum of 225V approx theoretically. Is this correct?
And for the other two transistors (BC807 & BC817), the maximum collector emitter voltage is 45V.
So, I see that the ESD Capacitors should be able to clamp the ESD pulses to less than 45V. If it does, then our components are safe. Correct?
My questions :
Are my above understandings correct?
How to find the Absolute maximum Voltage rating of the Zener diode?
And if the output voltage is connected as a regulator input, should I also check the maximum rating of the regulator too? As the ESD pulse is of very short during, the Zener D0004 may not have enough time to clamp it. But will the MOSFET allow this voltage to affect the downstream circuits connected to Output voltage?