I was doing some research on made in India USB-PD charger recently, that’s when I found this compact stuffcool USB-PD charger.
This charger is smallest size USB-PD charger in India as they claim and delivers 20W (Stuffcool Nuevo model) . It can output 5V at 3A, 9V at 2.22A and 12V at 1.67A. It is manufactured in India and is BIS certified.
First attraction is its yellow color and then it’s small size.
It is such a compact USB-PD charger, you won’ t believe it can output 20W.
It is not GaN based.
After using it for couple of hours I saw it heating it up but was not abnormal and little more heat for such a compact USB-PD charger is natural.
Opening the USB-PD charger was a bit difficult as expected.
Made in India, BIS Label on the USB-PD charger.
After opening what you get to see is two PCBs soldered together and everything confined in a small volume.
Input section is a typical Fuse with Capacitor Inductor EMI filter and a bridge rectifier.
After bridge and bulk capacitor AC input gets converted to high voltage DC and fed to the AC to DC converter IC. PC1 is the optocoupler for feedback and close loop control in a typical flyback circuit.
The AC to DC Power Converter chip operates at 65Khz typical frequency.
Flyback transformer used is EE16
All capacitors used are rated for 105 degree.
For the USB-C Power Delivery part, IP2189 is used. It supports both fast charging and PD charging protocols over CC and DM/DP lines.
IP2189 communicates with the device connected over USB-C and controls the power supply output accordingly by interfacing the feedback loop.
Typical application circuit is as shown below
To avoid shorting of Capacitor body with any other component, silicon rubber cap is used. I have seen this in many Chinese PCBs, common in power supply sections.
you can see the USB-C Connector on the PCB.
For a size comparison I kept three chargers together, one is Protoronics 18W USB-C PD charger, another one is 5V 2A USB A charger
That’s all in this teardown.
I hope you found it interesting and learned something new today.
I will write a new blog very soon. If you like it, do share it with your friends too.
I work as an embedded systems design consultant, helping companies build custom embedded products and develop test automation solutions for their PCBs.
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