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AN-4150 Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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AN-4150 Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 16 page AN-4150 APPLICATION NOTE © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ-Series Rev. 1.0.0 10/23/06 7 Figure 11. Typical B-H Characteristics of Ferrite Core (TDK/PC40) Table 1. Core Quick selection Table (for Universal Input Range, fs=55kHz and Single Output) [STEP-7] Determine the Number of Turns for Each Output Figure 12 shows the simplified diagram of the transformer. First, determine the turns ratio (n) between the primary side and the feedback-controlled secondary side as a reference. where Np and Ns1 are the number of turns for primary side and reference output, respectively, Vo1 is the output voltage and VF1 is the diode (DR1) forward voltage drop of the refer- ence output. Then, determine the proper integer for Ns1 so that the resulting Np is larger than the Np min obtained from Equation 14. The number of turns for the other output (n-th output) is determined by: The number of turns for Vcc winding is determined as: where Vcc* is the nominal value of the supply voltage of the FPS device and VFa is the forward voltage drop of Da as defined in Figure 12. It is typical to set Vcc* 3~4V below Vcc maximum rating (refer to the datasheet). Figure 12. Simplified Diagram of the Transformer With the determined turns of the primary side, the gap length of the core is obtained as: where AL is the AL-value with no gap in nH/turns 2; A e is the cross-sectional area of the core in mm2, as shown in Figure 10; Lm is specified in Equation 7; and Np is the number of turns for the primary-side of the transformer. Output Power EI Core EE Core EPC Core EER Core 0-10W EI12.5 EI16 EI19 EE8 EE10 EE13 EE16 EPC10 EPC13 EPC17 10-20W EI22 EE19 EPC19 20-30W EI25 EE22 EPC25 EER25.5 30-50W EI28 EI30 EE25 EPC30 EER28 50-70W EI35 EE30 EER28L 100 500 400 300 200 800 1600 0 0 Magnetic field H (A/m) Magnetization Curves (typical) Material :PC40 100 °C 120 °C 60 °C 25 °C n NP Ns1 --------- VRO Vo1 VF1 + -------------------------- == (EQ 15) Nsn () Von () VFn () + Vo1 VF1 + --------------------------------- =Ns1 ⋅ turns () (EQ 16) Na Vcc*VFa + Vo1 VF1 + ---------------------------- =Ns1 ⋅ turns () (EQ 17) Np N S1 - V RO + D R1 N a D a N S(n) D R(n) + V O(n) - + V O1 - + V F(n) - + V F1 - - V Fa + + V cc * - G 0.4 π × A e NP 2 10 9L m ----------------- 1 AL ------ – ⎝⎠ ⎜⎟ ⎛⎞ =mm () (EQ 18) |
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