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VIPER38HD bảng dữ liệu(PDF) 15 Page - STMicroelectronics

tên linh kiện VIPER38HD
Giải thích chi tiết về linh kiện  VIPerPlus family: peak power high-voltage converter
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VIPER38HD bảng dữ liệu(HTML) 15 Page - STMicroelectronics

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DocID025703 Rev 2
15/31
VIPER38
Operation
31
The following formula can be used for the CVDD capacitor calculation:
Equation 1
The parameter tSSaux is the time needed for the steady state of the auxiliary voltage. This
time represents an estimate of the user’s application according to the output stage
configurations (transformer, output capacitances, etc.).
During the converter startup time, the drain current limitation is progressively increased to
the maximum value. In this way the stress on the secondary diode is considerably reduced.
It also helps to prevent transformer saturation. The soft-start time lasts 8.5 ms and the
feature is implemented for every attempt of the startup converter or after a fault.
Figure 17. IDD current during startup and burst mode
C
VDD
I
DDch1
t
SSaux
×
V
DDon
V
DDoff
–
-----------------------------------------
=



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