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AN4248 bảng dữ liệu(PDF) 37 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  60 W PSU design details for water purifier system
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AN4248 bảng dữ liệu(HTML) 37 Page - STMicroelectronics

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AN4248
Short-circuit test
In Figure 34 , we can observe the behavior of the VCC voltage as described above. In
Figure 35, the waveforms are triggered in different time scale, where single switching pulses
are spaced with 150 us.
Figure 36 & 37 displays more clearly the single pulse timing and peak values of drain-
source voltage with leakage spike overshoot and peak drain current values. Triggered at
different levels corresponding to different Ton instants. Looking to figure 22, maximum drain
current is limited to 2.7 A peak approx and there is no saturation effect observed in
transformer.
The overall operation is safe and average input power from the mains drops to negligible
values.
Figure 32. Hold up test CH1: load current 2.4 A max; CH4: AC Input 230 V



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