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Hello everyone, today we will learn about the generation process of the common point before the adapter boost

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First of all, after we plug in the adapter,

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the CC bus of the adapter will be pulled down by the internal resistance of CD3217

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Then, the adapter will output the 5V before boost

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If the CC bus communication is interrupted, the adapter will not output voltage

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The adapter outputs 5V before boost to supply power to the VBUS pin of CD3217

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CD3217 will generate LDO_3V3 to provide power for U2890

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Then, CD3217 reads the data in the U2890 chip through the SPI bus

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At the same time, CD3217 will also control the conduction of the internal MOS tube

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It converts the power supply of the adapter to an external PPDCIN_G3H power supply

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This is a 5V power supply

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This power supply provides power to the P_IN pin of the charging chip through the current-sensing resistor

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After the pin is powered by 5V,

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the charging chip will output a linear voltage of 5V from the VDDP pin,

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and provide power to the VDDA and CELL pins of the charging chip

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The charging chip will drive the four switch tubes to turn on in turn

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according to the charging voltage set by the CELL pin,

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and work in the boost mode to boost the power supply of the adapter from 5V to 12.2V

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to provide power to the common point

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At the same time, it can also charge the battery

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Here is the battery voltage, which can be sent to the common point

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After the voltage of the adapter rises from 5V to 12V,

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it can also provide power to the common point

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The battery and the adapter can supply power to the common point at the same time

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The common point voltage needs to be returned to provide power to the PBUS pin of the charging chip

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to detect whether the common point voltage is normal

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Ok, this is the generation process of the common point before the adapter boost