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USBLC6-2P6 Datasheet(PDF) 4 Page - STMicroelectronics |
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USBLC6-2P6 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 14 page Technical information USBLC6-2 4/14 2 Technical information 2.1 Surge protection The USBLC6-2 is particularly optimized to perform surge protection based on the rail to rail topology. The clamping voltage VCL can be calculated as follow : VCL+ = VTRANSIL + VF for positive surges VCL- = - VF for negative surges with: VF = VT + Rd.Ip (VF forward drop voltage) / (VT forward drop threshold voltage) and VTRANSIL = VBR + Rd_TRANSIL.IP Calculation example We assume that the value of the dynamic resistance of the clamping diode is typically: Rd = 0.5 Ω and VT = 1.1 V We assume that the value of the dynamic resistance of the transil diode is typically: Rd_TRANSIL = 0.5 Ω and VBR = 6.1 V For an IEC 61000-4-2 surge Level 4 (Contact Discharge: Vg = 8 kV, Rg = 330 Ω), VBUS = +5 V, and if in first approximation, we assume that : Ip = Vg / Rg = 24 A. So, we find: VCL+ = +31.2 V VCL- = -13 V Note: The calculations do not take into account phenomena due to parasitic inductances. 2.2 Surge protection application example If we consider that the connections from the pin VBUS to VCC, from I/O to data line and from GND to PCB GND plane are done by tracks of 10 mm long and 0.5 mm large, we assume that the parasitic inductances LVBUS, LI/O and LGND of these tracks are about 6 nH. So when an IEC 61000-4-2 surge occurs on data line, due to the rise time of this spike (tr=1ns), the voltage VCL has an extra value equal to LI/O.dl/dt+LGND.dI/dt. The dI/dt is calculated as: dI/dt = Ip/tr = 24 A/ns The overvoltage due to the parasitic inductances is: LI/O.dl/dt = LGND.dI/dt = 6 nH x 24 A/ns = 144 V By taking into account the effect of these parasitic inductances due to unsuitable layout, the clamping voltage will be : VCL+ = +31.2 + 144 + 144 = 319.2 V VCL- = -13.1 - 144 - 144 = -301.1 V |
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