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HUFA76407DK8T Scheda tecnica(PDF) 8 Page - Fairchild Semiconductor |
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HUFA76407DK8T Scheda tecnica(HTML) 8 Page - Fairchild Semiconductor |
8 / 12 page ©2001 Fairchild Semiconductor Corporation HUFA76407DK8 Rev. B TJ2 = (0.5 Watts)(159 oC/W) + (0 Watts)(97oC/W) + 70°C TJ2 = 150 oC The transient thermal impedance (ZθJA) is also effected by varied top copper board area. Figure 24 shows the effect of copper pad area on single pulse transient thermal impedance. Each trace represents a copper pad area in square inches corresponding to the descending list in the graph. Spice and SABER thermal models are provided for each of the listed pad areas. Copper pad area has no perceivable effect on transient thermal impedance for pulse widths less than 100ms. For pulse widths less than 100ms the transient thermal impedance is determined by the die and package. Therefore, CTHERM1 through CTHERM5 and RTHERM1 through RTHERM5 remain constant for each of the thermal models. A listing of the model component values is available in Table 1. (EQ. 5) T J2 P 2 RθJA P1Rθβ TA ++ = 0 40 80 120 160 10-1 100 101 102 103 FIGURE 24. THERMAL RESISTANCE vs MOUNTING PAD AREA t, RECTANGULAR PULSE DURATION (s) COPPER BOARD AREA - DESCENDING ORDER 0.020 in2 0.140 in2 0.257 in2 0.380 in2 0.493 in2 HUFA76407DK8 |
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