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AN4402 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN4402 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 39 page  DocID025557 Rev 1 11/39 AN4402 Demagnetization energy 38 3.1 Low-side configured output Figure 7 represents the equivalent electrical diagram during the turn-off phase of a low-side configured output which drives an inductive load with parallel resistor. Figure 7. Equivalent electrical diagram during the turn-off phase of an inductive load with parallel resistor, driven by a low-side configured output. VL is negative during the turn-off phase according to the used sign convention, since diL/dt < 0. 3.2 Calculation of the demagnetization energy Right after the turn-off, assuming that the active clamp is activated (iCL> 0): Equation 1 Equation 2 with Taking the time origin as the moment when the output is turned off, this differential equation (Equation 2) accepts the following general solutions (for t ≥ 0): V BAT R LiL L di L dt -------- V CL_LS ++ = di L dt -------- i L τ ---- + V BAT V CL_LS – τR L ---------------------------------------- = τ L R L ------- = |
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