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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4544 датащи(PDF) 17 Page - STMicroelectronics |
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AN4544 датащи(HTML) 17 Page - STMicroelectronics |
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17 / 35 page  DocID026535 Rev 1 17/35 AN4544 Datasheet explanation 35 Figure 13. Maximum normalized ZthJC function of pulse duty factor (δ) and loading time (tp) Figure 13 shows the variation of the normalized thermal impedance for the specified pulse duty factor δ=tp/t as a function of the loading time tp (pulse width). The dissipated heat has to pass through several different layers with their thermal resistances and thermal capacitances. Therefore, according to the pulse length, either the thermal resistance or the thermal capacitance handle with the device’s behavior. The increase of the junction temperature can be calculated as follows: TJstart = TC: Equation 7 10 -5 10 -4 10 -3 10 -2 10 -1 tp(s) 10 -2 10 -1 K 0.2 0.05 0.02 0.01 0.1 Zth=k Rthj-c δ=tp/t tp t Single pulse δ=0.5 ZthTO2T_B T j T Jstart ΔT j T Jstart Z thJc tp,δ () P tot T Jstart k + = × t p,δ () R thJc P tot × × + = + = |
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