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AN2747 Datasheet(PDF) 27 Page - STMicroelectronics

Part # AN2747
Description  250 W HID metal halide electronic ballast
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2747 Datasheet(HTML) 27 Page - STMicroelectronics

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AN2747
Auxiliary power supply
27/44
6
Auxiliary power supply
The proposed power supply can be successfully applied in applications requiring 15 V for
the power switch gate driver. This circuit assures good performance in terms of size and
performance at very low cost.
It is based on the VIPer12A-E in nonisolated buck configuration. Figure 27 shows the
schematic.
Figure 27.
Auxiliary power supply
The VIPer12A-E is a low-cost smart power device with an integrated PWM controller that is
suitable for such applications.



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