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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8572ECLPXATLD датащи(PDF) 124 Page - Freescale Semiconductor, Inc |
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MPC8572ECLPXATLD датащи(HTML) 124 Page - Freescale Semiconductor, Inc |
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124 / 140 page  MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4 124 Freescale Semiconductor Thermal Vf = Voltage forward biased VH = Diode voltage while IH is flowing VL = Diode voltage while IL is flowing IH = Larger diode bias current IL = Smaller diode bias current q = Charge of electron (1.6 x 10 –19 C) n = Ideality factor (normally 1.0) K = Boltzman’s constant (1.38 x 10–23 Joules/K) T = Temperature (Kelvins) The ratio of IH to IL is usually selected to be 10:1. The above simplifies to the following: Solving for T, the equation becomes: VH – VL = 1.986 × 10 –4 × nT nT = VH – VL __________ 1.986 × 10–4 |
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