Satechi 72W TYPE-C PD car charger teardown

admin Teardown Leave a Comment

I have been using Satechi 72W car charger in my solar home project to power my laptop for about 3 months. I have noticed that at high load it gets too hot, and I suspected that there might be a bad connection in the car lighter socket, which would contribute to the heat generation. I have decided to take the charger apart, and solder wires directly to the PCB, to eliminate risk for a bad connection.

Doing a tear down was not as effortless as expected. It was relatively easy to remove the aluminum cap, but I was struggling with removing the PCB. I had to remove the plastic piece by piece only to find out that I could easily remove the PCB by pressing the ground contacts, so that they go inside of the case. The PCB then just slides out.

I was a bit surprised to find that the whole board was coated in a soft and thick material. It was easy to remove, and it didn’t seem it would provide any protection against moisture or condensation. The material did feel cold to touch, so it is probably used for improved thermal dissipation.

I could identify the key components:

There are two inductors, one is used for the buck-boost converter, and another one supposedly for the buck converter (5V for USB-A connector), which I couldn’t identify (marked as AVZ J16 655).

Efficiency and standby power

In one of my previous posts I have also measured the efficiency and standby power.

Anker PowerDrive 2 and Satechi 72W USB-C PD standby current depending on the input voltage
Satechi charger has two to six times larger standby current compared to Anker.

Anker PowerDrive 2 and Satechi 72W USB-C PD standby power depending on the input voltage
Satechi charger has significantly larger standby power compared to Anker.
Satechi 72W USB-C PD efficiency depending on the input voltage and output power
Satechi charger has a decent efficiency of about 85% on average. At 8W@9V ouput, charger works down to 4V input, at 25W@20V down to 9V. I couldn’t measure at any lower input voltage at 60W@20V, because my bench power supply can’t provide more than 5A.
Anker PowerDrive 2 and Satechi 72W USB-C PD efficiency via USB-A ports depending on input voltage
Satechi has slightly lower efficiency compared Anker, when using USB-A port. The comparison, however, is a bit unfair, since power output is not the same.

// Check out other posts

0 0 vote
Article Rating
Subscribe
Notify of
guest
0 Comments
Inline Feedbacks
View all comments