Teardown of Mercedes-Benz V-CLASS Original 36W Charger
Although the Mercedes-Benz V-Class original 36W charger looks like a general car charger, it is not essentially a car charger because it is a part of the car itself, which connects to the power by its metal plug instead of a cigarette lighter.
ChargerLAB has gotten it, and we will take it apart.
The charger consists of three parts: the charger body, the wire and the connector.
The connector is an irregular white plastic case to distinguish between positive and negative polarity.
Inside the connector are two flat metal prongs.
The black PC plastic shell adopts the shape of a screw with screw threads. It is fixed by rotating and is easy to remove and replace.
There is also a nut used to fix the charger and a sealing rubber ring. The gear design of the nut is to avoid slipping when assembling.
The bottom is designed with + and - symbols for easy distinction between positive and negative red and black wires.
Parameters are printed on one side of the charger. It supports 12-24V DC input and 2x5-12V~2x3A Max output with 36W maximum output power.
The other side is printed with the name of the charger and the information of the supplier.
The edge of the top is round.
The top is equipped with one orange USB-A port and one black USB-C port. It is also printed with QC3.0, TYPE-C + PD, showing that the port supports the corresponding fast charging protocol.
The charger body's size is about 39.42 X 35.87 X 25.78 mm (1.55 X 1.41 X 1.01 inches).
The weight of the whole charger is about 32g (1.12oz).
The ChargerLAB POWER-Z KT002 shows that the USB-A port supports Apple 2.4A, Samsung 5V2A, DCP protocol, and QC2.0/3.0, AFC, FCP, SCP, and PE2.0 fast charging protocols at 12V DC input.
The USB-C port supports QC2.0/3.0, AFC, PD3.0, and PPS fast charging protocols.
The USB-C port also supports three fixed PDOs of 5V3A / 9V2A / 12V1.5A and two PPS of 3.3-5.9V3A /3.3-11V2A.
The USB-A port also supports QC2.0/3.0, AFC, FCP, SCP and PE2.0 fast charging protocols at 24V DC input.
The USB-C port supports QC2.0/3.0, AFC, FCP, PD3.0 and PPS fast charging protocols at 24V DC input.
And it supports three fixed PDOs of 5V3A / 9V2A / 12V1.5A and two PPS of 3.3-5.9V3A /3.3-11V2A.
Remove the connector shell.
The metal prongs are kind of like an American standard plug.
Take the top of the charger apart to remove the PCBA module.
The module consists of a combination of two small rectangular and round boards soldered together.
The small rectangular board has a buck protocol chip for USB-A port output, and the back of the small round board has the inductor and solid capacitor.
The other side of the small rectangular board features two solid capacitors and an inductor.
Two USB receptacles are soldered on the front of the small round board, and there is a buck protocol IC in the center for USB-C port output.
This is the green SMD fuse.
The SS54 Schottky diodes are used for anti-reverse.
One TVS is used for overvoltage protection.
The input filter solid capacitor is from Yunxing Electronic, with a specification of 100μF 35V and protective plastic insulation.
The USB-A port buck protocol IC adopts iSmartWare SW3521, a highly integrated fast charging protocol charging chip that integrates a 3.5A high efficiency synchronous buck converter and supports multiple fast charging protocols such as QC/AFC/FCP/SCP/PE/SFCP and CC/CV modes. It only needs a few peripheral components to form a complete high-performance fast charging protocol charging solution.
After taking the charger apart, ChargerLAB found that the iSmartWare SW3521 is also adopted by the Baseus 160W multi-port fast charging car charger.
The buck inductor is covered by a heat shrink tube for insulation.
The buck output filter solid capacitor is also from Yunxing Electronic, with a specification of 25V 220μF.
This USB-A receptacle with wider positive and negative supports high current fast charging.
The USB-C port buck protocol IC adopts iSmartWare SW3522, a highly integrated fast charging protocol charging chip that integrates a 3.5A high efficiency synchronous buck converter and supports multiple fast charging protocols such as PD/QC/AFC/FCP/SFCP and CC/CV modes. It only needs a few peripheral components to form a complete high-performance fast charging protocol charging solution.
After taking the charger apart, ChargerLAB found that the iSmartWare SW3522 is also adopted by the Baseus 160W multi-port fast charging car charger, JOYROOM 45W 3-in-1 car charger, and so on. The other fast charging chips of iSmartWare are also adopted by Asus, Nubia, Rapoo, UGREEN, Lenovo and dozens of other products of well-known brands.
The buck inductor is also protected by an insulating tube.
The Yunxing solid filter capacitor is 25V 220μF.
Here is the USB-C receptacle.
Summary of ChargerLAB
The Mercedes-Benz V-Class original 36W charger is equipped with one orange USB-A port and one black USB-C port, supporting QC2.0/3.0, AFC, FCP, SCP, PE2.0, PD3.0 and PPS fast charging protocols, with a maximum power of 36W.
After taking the charger apart, ChargerLAB found that the charger adopts the iSmartWare SW3521 and SW3522, two buck protocol ICs to control the USB-A and USB-C ports output, respectively, with excellent compatibility. In addition, the high integration also helps the charger to be tiny.
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