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AN4205 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN4205 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 23 page AN4205 Input stage of the AC/DC converter Doc ID 023929 Rev 1 9/23 From Equation 4, we can determine the number of secondary turns: We can also calculate the auxiliary needed to supply the driver. The driver used is the UC3842 which is driven by 15 V. Equation 16 The next step is to determine the air gap length (lg) of the core and the inductance of a single turn (AL). Knowing the primary inductance, the inductance of a single turn can be calculated: Equation 17 In this case we chose the standard value AL=100 nH. Now the air gap length is known: Equation 18 From the datasheet of the core K1 = 42.2 and K2 = -0.701 Before proceeding to calculate the wire dimension, we can verify if the selected core is acceptable (safety condition) with regard to thermal operation. Using Ampere's law we can calculate the B field: Equation 19 The magnetic permeability µfe is much higher than µ0 (the magnetic permeability in the air), so we can neglect the last term in Equation 19. Equation 20 This result confirms the accuracy of the hypothesis about ΔBmax. N P 155 ≈ N PS 28 155 () ≈ N P N Aux ------------- V fl V Aux V F diode , + ----------------------------------------- 100 15 1 + ---------------- 6.25 == = N Aux 25 = L P N PAL = A L L P N P ------- 85nH == 2 2 l g A L K 1 ------ 1K 2 ⁄ = l g 0.3mm = N PIP Hdl ° ΣH ili H glg H felfe + B μ 0 ------lg B μ fe -------lfe + == = = N PIP B μ 0 ------lg = B194mT = |
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