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Failure of transient voltage suppresor

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GopiGovindasamy

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I am Currently Working with a circuit which needs CE -61000-4 Safety Standard (Protection from High voltage surge and transient voltage pulse).

A 28V DC supply is used to power an Operational Amplifier (OP452TA) in the circuit .In this 28V DC line, when a transient voltage pulse of 2kv-50nS is injected for testing. The Operational amplifier failed to withstand this high voltage and it burned out.

In order to protect the circuit from surge and transient voltage, I used a TVS (SMCJ30CA) across the power lines of Op-Amp. On testing with 2KV, 50ns Transient pulse we got an output of 250VDC .The maximum input voltage to Op-Amp should be less than 80VDC so again the test has failed.

Can someone help me in fixing out this problem?
 

Looking at the spec sheet for the smcj 30ca, it should clamp at about 30V with a max of 48 V at 50 Amps through it. How come a transient 2KV for 50nS, gave a 250 DC output?? With these short pulses and very high peak currents, the layout is very important else you get ringing on what is supposed to be an earth track. How do you know that your CRO is not picking up a radiated spike?
Frank
 

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