AN4070 datasheet(21/53 Pages) STMICROELECTRONICS

部件名	AN4070

功能描述	250 W grid connected microinverter

PDF	53 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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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.

AN4070 数据表(PDF) 21 Page - STMicroelectronics