Today, our protagonist will be this 100W GaN charger, from a well-known band Satechi.
It has two USB-C and one USB-A port. The input end adopts this kind of port.
It means the power cable can be replaceable. You can choose a longer one
to meet your own needs or other kinds of AC power cable.
And the charger adopts the gray plastic case.
There are four bottom pads at the back, which make it suitable to use on the desktop.
Use ChargerLAB POWER-Z tester to see the details. It supports 100W charging and 5A PPS.
Then, let’s open it directly. We can see an integrated copper heat sinks inside.
There is also a thermal pad on the upper and lower sides and a layer of copper foil on the side.
A lot of thermal conductive glue is filled around the PCB module for reinforcement.
After opening it, the big capacitor in the middle is lie down on the board.
And the thermal conductive glue for reinforcement between it and
the transformer and other components. The rectifier bridge and the secondary
synchronous rectification MOS tube also have this kind of copper plates for heat dissipation.
The small protocol board on output end is welded vertically on it.
Turn it to the back. Here is a PFC boost controller from PI.
The master control chip of switching power supply is in the middle.
Also from PI. Here is the output side.
The corresponding chip is a step-down protocol chip for the USB-A port.
There are two groups of secondary step-down circuits of each USB-C port,
three chips as a group.
The charger is basically used PFC to power the flyback switching power supply,
and output the fixed voltage after synchronous rectification using switching power supply.
Next, let’s take a look at the components one by one.
First of all, this part is the input filter and rectifier circuit.
After rectification, it is boosted by this PI boost controller.
The corresponding side is the PFC boost inductor.
After boosting, filter current through this large filter capacitor.
The yellow one on the outside is an insulating tube.
Next, it’s the switching power supply part. The master control chip of the switching
power supply is also from PI.
This chip is PI’s latest PowiGaN
with built-in GaN power component. Many well-known products on the market have been used
Including Samsung 45W PD charger, Xiaomi 9 original 27W charger.
And OPPO original 65W charger, Google Pixel, etc.
The corresponding area on the other side is the transformer.
Next, it’s the synchronous rectification part Here is the synchronous rectifier MOS tube.
Finally came the output part. The step-down protocol chip
of USB-A comes from Injoinic. A step-down inductor is on the front.
There is also a filter capacitor for buck output next to it.
The back of the two USB-C ports correspond to two step-down circuits.
This little one is a synchronous rectifier buck converter
Two external MOS tubes Three as a group.
The bust conversion for both groups is the same. The front side has the step-down inductor,
buck output filter inductor and buck output filter capacitor for two circuits.
There are two protocol ICs from Hynetek on the small board, which support fast
charging protocols such as PD, PPS, QC, FCP, etc. It is also used by many well-known manufacturers,
such as Belkin, Turas, Nanfu, etc.
Ok, that’s all for today’s teardown. You can find the purchase link in the
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See you, peace!