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AN4248 датащи(PDF) 37 Page - STMicroelectronics

номер детали AN4248
подробное описание детали  60 W PSU design details for water purifier system
PDF  46 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4248 датащи(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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