In this article, we will look at the Xiaomi MDY-09-EW charger. Output voltage is 5 V, load current is up to 2 Amperes Let's see what components are installed on the board
But first, check the charging with the USB tester fnirsi fnb48p. With a load of 1.1 Amperes, the charging output will be 5.2 Volts
On the board you can see that two polymer capacitors are used in the low-voltage circuit. This is already not bad, you can rarely see this.
And now the microcircuits. There are two of them here, although usually one microcircuit is used as a converter. What is another one for?
The voltage converter chip is OB2502
The second microcircuit OB2005VCP is a synchronous rectifier. Usually, one diode is used in rectifiers in such chargers. Here, a special microcircuit with a field-effect transistor is used instead of a diode. The microcircuit replaces the rectifier's e diode and due to this, the rectifier operates with better efficiency. Less voltage drop on the rectifier on the field-effect transistor, respectively, less heat is generated and safety is better
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