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Charged Board Model ESD Simulation for Printed Wiring Boards

Contents. Charged board model (CBM) type ESD event"Exact" modelingSimplified CST-modelSample case: a component on various environmentsConclusions. Charged Board Model (CBM). CBM is a fast electrostatic discharge (ESD) eventCBM type event occurs, when a charged printed wiring board dischargesCh

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Charged Board Model ESD Simulation for Printed Wiring Boards

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    1. Charged Board Model ESD Simulation for Printed Wiring Boards Timo Tarvainen Esju Oy, Oulu, Finland

    2. Contents Charged board model (CBM) type ESD event ”Exact” modeling Simplified CST-model Sample case: a component on various environments Conclusions

    3. Charged Board Model (CBM) CBM is a fast electrostatic discharge (ESD) event CBM type event occurs, when a charged printed wiring board discharges Charging can be caused, for instance, by surrounding plastic cover or a manufacturing line CBM differs from the standardized Charged Device Model (CDM), because the whole board is considered Therefore, higher currents and energy are possible

    4. About ”Exact” Modelling Solving the initial conditions (i.e. the static electric field and potentials on the board and nearby environment) Letting the discharge probe approach the discharge point (slowly) and correcting the field Modeling the possibly non-linear discharge event (e.g. a spark between the probe and the board)

    5. Simplifying the Model Only the events after the discharge moment will be simulated (i.e. the probe will not have an effect to the static field) The discharge is modeled with a switching signal The rise time for the exitation signal is set to about 100ps

    6. CBM simulations with CST MWS It can be seen, that the CBM threath varies greatly according to the PWB environment

    7. Discussion & Conclusions Model verification results will be presented in EOS/ESD Symposium 2007 (see Reinvuo, Tarvainen, et al.) Exact modelling is difficult Simplified CST models can be used to evaluate CBM threats

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