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AN1262 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN1262 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 42 page  11/42 AN1262 APPLICATION NOTE Due to the moderate switching frequency, Bmax will be limited by core saturation and not by core losses. This means that transformer's power losses will be located mostly in the windings. As shown in table 9, ferrites saturate above 0.3 T thus a value of Bmax equal to 0.28-0.30 T may be selected to maximize core utilization, or Bmax = 0.25 T can be chosen for a more conservative design. This maximum peak flux density will occur when the peak primary current is maximum. However, it is not suffi- cient to consider the peak current Ippkx resulting from table 6. To guarantee that the transformer does not sat- urate even under short circuit conditions, the maximum peak primary current to be considered is the maximum value of the OCP threshold (Ilim = 0.7A, from the datasheet). Now a step-by-step procedure for the design of the transformer will be given. Table 10. Core list and significant design data 1) Choose core size. Transformer's core must be able to handle the power throughput PinT without saturating and with acceptable power losses, with the minimum size. Determining its optimum size is a trial-and-error process and a proper starting point may reduce considerably the number of iterations needed. A most common way of describing core size is the so-called Area Product (AP), which is the product of the effective cross-sectional area of the core times the window area available to accommodate the windings. It is possible to define the minimum AP required by a specific application. The following equation can be useful to estimate the minimum AP (in cm4) required: Core Ve [cm3] Ae [cm2] Aw [cm2] AP [cm4] K1 K2 Lt [cm] WB [cm] Rth [°C/W] THOMSON (B2) EF1505A 0.51 0.15 0.15 0.022 29.7 -0.68 2.63 0.92 75 EF2007A 1.46 0.31 0.26 0.081 61.1 -0.7 3.65 1.32 45 EF2509A 3.3 0.58 0.4 0.232 103 -0.73 4.64 1.64 30 E2006A 1.5 0.32 0.35 0.112 62.2 -0.7 3.9 1.18 46 E2507A 3.2 0.55 0.6 0.33 90 -0.73 5.2 1.54 40 PHILIPS (3C85) E16/8/5 0.75 0.201 0.216 0.043 42.2 -0.7 3.3 0.94 65 E20/10/6 1.49 0.32 0.35 0.112 62.2 -0.69 3.9 1.18 46 E25/13/7 2.99 0.52 0.56 0.291 90 -0.73 4.9 1.56 40 EPCOS (ex S+M) (N67) E16/8/5 0.76 0.2 0.22 0.044 42.2 -0.7 3.4 1 65 E20/10/6 1.49 0.32 0.34 0.109 62.2 -0.69 4.12 1.25 46 E25/13/7 3.02 0.52 0.61 0.317 90 -0.73 5 1.56 40 TDK (PC30) EI16-Z 0.67 0.198 0.267 0.053 66 -0.57 3.31 0.86 44 EI22-Z 1.63 0.42 0.2 0.084 85.4 -0.71 3.86 0.845 33 EI25-Z 1.93 0.41 0.425 0.174 119 -0.57 4.94 0.98 31 MMG - NEOSID (F44) EF16 0.754 0.225 0.216 0.049 42.2 -0.7 3.3 1 65 EF20 1.5 0.314 0.348 0.109 62.2 -0.69 3.9 1.2 46 EF25 3.02 0.515 0.564 0.29 90 -0.73 4.8 1.6 40 |
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Similar Description - AN1262 |
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