Not long ago, OPPO released the new OPPO 65W GaN Fast Charger with Gallium Nitride. A rather innovative product both for the high power and for the small size that have made it the ideal companion for those who want to recharge their smartphone quickly wherever you are.
OPPO 65W GaN Fast Charger seen from inside: here is the teardown
Well, today the Chinese media released the device's teardown; so let's find out how it is from inside!
Obviously we start by removing the outer shell and extracting the PCB board with all the various components.
The front side of the PCB has a compact and uncluttered component layout. At the same time there is also some glue to keep everything tight. There are also isolation plates on both sides of the transformer.
The back of the PCB is also, at a glance, covered with insulation plates and heat sinks.
The back of the motherboard is equipped with a bridge, a main control chip, a gallium nitride power chip, an optocoupler and a protocol chip. The primary and secondary boundaries are evident. Furthermore, we have a perforated design with two solid capacitors which further reduces the thickness of the body.
Also, looking at the PCB board circuit, it was found that OPPO's new 65W GaN charger adopts a switch power supply with a wide range of outputs, and the PD protocol chip controls the output voltage structure through an optocoupler .
But now let's take a closer look at each component starting with the fuse, the X capacitor, the common mode inductor and the filter inductor.
From a side view we see the presence of an NTC surge suppression resistor between the safety capacitor X and the plastic case. The plastic case is used to support the isolation transformer.
Here we have a close up of the fuse instead, with its specs being 2,5A 250V.
Then there is a heat shrink tube protection with NTC surge suppression resistance coating, used to suppress the surge current.
The safety X capacitors come from STE Matsuda Electronics and there is a common mode inductor heat shrink tubing, used to filter out EMI interference.
From another side view of the PCB board, the electrolytic capacitor of the high voltage filter is placed horizontally and there is a plastic shell to isolate it from the main board with the solder end covered with an insulating tube.
The electrolytic capacitor with high voltage filter is from AiSHi Aihua, the specification is 400V 82μF.
For the output, it is noted that the charger uses a three-layer stack PCB design. The top layer is the small transformer board, the middle small board is soldered with the USB socket, and the bottom layer is the main board
By removing the small transformer plate, we see that the right side of the planar transformer is equipped with a synchronous rectifier controller and MOS tube.
While on the back there are two solid capacitors with output filter.
By removing the small front board, capacitors and other components, you can see that there are four Y patch capacitors and VBUS output switching valves on the motherboard.
The main control chip of the charger is ON Semiconductor NCP1342, which is a high frequency quasi resonant flyback primary PWM controller with built-in active X2 capacitor discharge and multiple comprehensive protection functions.
Finally, the main control chip NCP1342 from ON Semiconductor that we have on the OPPO 65W GaN fast charger is the same that we find on the Lenovo Thinkplus 65W Pro gallium nitride charger, the Xiaomi 120W super fast charger, the 120W iQOO flash charger, Aoji 100W Gallium Nitride Charger, Lenovo 90W Dual Port Gallium Nitride Charger, Nubia 65W Gallium Nitride Charger, Rock 65W PD Quick Charger, Philips 65W Quick Charge Socket and many more. So this is a high quality chip that we find on almost all gallium nitride chargers.
