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AN4070 Datasheet(PDF) 21 Page - STMicroelectronics |
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AN4070 Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 53 page  AN4070 Schematic description Doc ID 022934 Rev 1 21/53 connected between the gate and source of each inverter MOSFET. The supply voltage of the inverter gate drive circuit is provided by two isolated, integrated DC-DC converters whose input is the 5 V generated by the auxiliary power supply connected to the PV input. The schematic of the auxiliary power supply is shown in Figure 14. The two L4971s are connected to few external components in order to implement two buck converters used to step down the input voltage to +15 V and to +5 V. The 3.3 V supplying the STM32F103xx microcontroller is then generated from the 5 V using a standard linear regulator. The 3.3 V is also used to supply a digital-to-analog converter mounted on the demonstration board for debugging purposes. |
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