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AN4070 Datasheet(PDF) 14 Page - STMicroelectronics |
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AN4070 Datasheet(HTML) 14 Page - STMicroelectronics |
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14 / 53 page  DC-DC converter design AN4070 14/53 Doc ID 022934 Rev 1 HF transformer design The design is based on the specifications reported in Table 5 and has been used to provide the main parameters required by HF transformer manufacturers for the realization of the prototypes. The design procedure and equations are shown in the section below. 1. Calculation of total transformer power: Equation 20 Table 5. HF transformer specifications Specification Value Turns ratio 2.6 RMS input current 4.7 A Nominal output voltage 380 V Minimum output voltage 370 V Output current 1.77 A Switching frequency 35 kHz Efficiency 98% Max. operating flux density 0.05T Window utilization 0.3 Duty cycle 0.45 Temperature rise 30 °C W P P T outT T app 1 . 255 98 . 0 250 _ = = = η |
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