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KBMFXXSC6 Datasheet(PDF) 4 Page - STMicroelectronics |
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KBMFXXSC6 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 8 page KBMFxxSC6 4/8 To have a good approximation of the remaining voltages at both Vinput and Voutput stages, we give the typical dynamical resistance value Rd. By taking into account these following hypothesis : Rt>Rd, Rg>Rd and Rload>Rd, it gives these formulas: Vinput RV RV R gBR d g g = + .. Voutput R V R Vinput R SBR d t = + .. The results of the calculation done for VPP=8kV, Rg=330 Ω (IEC 61000-4-2 standard), Vbr=7V (typ.) and Rd = 1ohm (typ.) give: Vinput = 31.2 V Voutput = 7.8 V This confirms the very low remaining voltage across the device to be protected. It is also important to note that in this approximation the parasitic inductance effect was not taken into account. This could be few tenths of volts during few ns at the input side. This parasitic effect is not present at the output side due the low current involved after the resistance RS. The measurements done here after show very clearly (Fig. A5) the high efficiency of the ESD protection : - no influence of the parasitic inductances on output stage - Voutput clamping voltage very close to Vbr (positive strike) and -Vf (negative strike) TEST BOARD ESD SURGE 16kV Air Discharge Vin Vout Fig. A4: Measurement conditions |
Similar Part No. - KBMFXXSC6 |
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Similar Description - KBMFXXSC6 |
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