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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2689 датащи(PDF) 30 Page - STMicroelectronics |
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AN2689 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 42 page  Supply rail protection AN2689 30/42 Doc ID 14310 Rev 3 Figure 40. LD5505 output voltage in open circuit Figure 41. LD5505 output current in short circuit Figure 41 shows the current waveform corresponding to the pulse 5a of the ISO 7637-2 standard delivered by the SCHAFFNER NSG5500 generator when terminations are short circuited The tp duration measured between Ip and Ip/2 is 28.5 ms. Then the time constant calculated is 40.7 ms (generator outputs short circuited). 4.5.1 Determination of Rd For tp > 1 ms, Rdtp is given by: tp is in seconds in this case. , and define the transient thermal impedance (see Table 3: Transient thermal impedance versus packages). When the surge is applied to the RBO40-40 transient suppressor: And the time constant is = R sC. Test conditions 87 V, 100 ms 13.5 V battery voltage Rs = 2 Ω Ipp = 40 A At I = 0.5 Ipp, tp = 0.7 so = 40.7 ms τ τ tp = 28.5 ms 2 1 nom Β tp a j tp Vbr e TRth Rd ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ - = - - τ α () 2 ln 40 40 tp RBO Rd Rs C tp + = - |
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