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L4979D Datasheet(PDF) 16 Page - STMicroelectronics |
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L4979D Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 22 page  Package and PCB thermal data L4979D, L4979MD 16/22 Doc ID 10262 Rev 9 Equation 2: pulse calculation formula where = t P/T Figure 12. Thermal fitting model of Vreg in SO-20 Table 12. SO-20 thermal parameter Area (cm2)Footprint 2 R1 (°C/W) 4 R2 (°C/W) 2 R3 (°C/W) 2.2 R4 (°C/W) 10 R5 (°C/W) 15 R6 (°C/W) 35 18 C1 (W.s/°C) 0.0003 C2 (W.s/°C) 0.0025 C3 (W.s/°C) 0.015 C4 (W.s/°C) 0.15 C5 (W.s/°C) 1.5 C6 (W.s/°C) 4 7 Z TH R TH Z THtp 1 – + = |
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