First, Google 45W USB PD charging appearance
The Google 45W USB PD Charger features a pure white casing that is generally square-shaped, horizontal and vertical, with sharp edges and corners that look tough. Google's brand logo is printed on the top of the charger.
This charger comes standard with an English-style pin, the third of which is a retractable design with detailed product parameters on the side of the pin.
Model: W16-145N5B, output support 100-240V~1.2A 50/60Hz, output support 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/2.25A, maximum output power is 45W. Meet the US six energy efficiency certification, and has passed the CE certification.
Unlike our common USB PD charger, the output connector of this charger is set to the side.
The thickness of Google's charger is slightly larger than the diameter of a dollar coin, and the body length is equivalent to the diameter of three coins.
The net weight of the charger is around 131g, which is very solid in the hand.
Use ChargerLAB POWER-Z KT001 to detect the charger's output protocol, display support for USB DCP, and do not support other conventional fast charge protocols.
The PDO message of the USB-C port is displayed, and supports 5V/3A, 9V/3A, 12V/3A, 15V/3A, and 20V/2.25A, which are identical to the nominal parameters. The protocol version is PD3.0. The charger only supports USB PD, a fast charging protocol, strictly in accordance with the standards of the USB-IF Association, and is worthy of Google.
Second, Google 45W USB PD charging disassembly
Open the case from the top of the charger, you can see the internal PCBA module, the output end is supported by a plastic skeleton.
After extracting the PCBA module, you can see that the internal AC pin extends out of the two wires to power the PCBA module.
Remove the pin fixing screws and remove the AC pin.
The surface of the PCBA module inside the charger is covered with plastic baffles and metal fins, and the package is very tight.
The back side also uses a plastic insulation board with a metal heat sink to achieve uniform heat dissipation.
A large area of heat sink is used inside the charger to meet the heat dissipation requirements of high power output. After removing the heat sink, you can see that a large amount of thermal silica gel is filled between the components on the front side of the PCB. In addition to thermal conductivity, silica gel also acts as a fixed component.
The chip on the back of the PCB is also coated with thermal silica.
The USB-C output connector is secured to the black plastic frame with two screws to enhance structural strength.
Remove the black plastic skeleton and you can see that the USB-C protocol board is soldered vertically on the main PCB.
There is a USB PD protocol chip on the protocol board, in addition to an AOS VBUS switch.
USB PD protocol chip, from the great WT6615F. The WT6615F is a USB PD controller that supports the USB PD 3.0 specification and Qualcomm QC3.0 and QC4 technologies, and supports DFP downstream port (source) charging applications. The highly integrated WT6615F can be used in adapters, car chargers, mobile power supplies, etc., while the WT6615F supports USB PD's latest Programmable Power Supply (PPS) specification, which is commonly used in mobile devices.
The charging head network has learned that the products of the WT6615F include AUKEY 27W USB PD charger, ANKER 30W GaN GaN charger, RAVPower 45W GaN PD charger, Zi Mi 18W USB-C PD charger, Momis MOMAX UM10CN 18W PD charger, QwTech 18W QC4+ charger and other products, is a very mature USB PD protocol chip.
Next to the protocol chip is the output switch MOS, AOSMD AO4447A -15A/-30V SOP8 P-channel MOS tube FET.
USB-C interface close-up.
The input ends from left to right are rectifier bridge, inductor, X safety capacitor, AC input buckle interface. Since the AC input interface is next to the USB-C output interface, a plastic insulation baffle is placed between the two to avoid AC-DC straight-through and damage the device.
A solid-state filter capacitor is placed next to the USB-C protocol board. The transformer is wrapped with 3M tape. Under the silica gel, the input filter aluminum electrolytic capacitor is very large and meets the needs of high power.
Input filter aluminium electrolytic capacitor, brand SAMXON, specification 400 V 68 UF.
Output filter solid state capacitance, specification 25V 680 μ F.
Label the transformer.
Enter the rectifier bridge.
After removing the silica gel, a time-delay fuse is available with a specification of 2.5A 250V.
The blue Y capacitor between the primary and secondary acts as an output anti-interference.
The secondary synchronous rectifier between the Y capacitor and the output solid-state filter capacitor is from Infineon, model BSC098N10NS5.
Infineon BSC098N10NS5 specifications.
Remove the thermal silicone on the back of the PCB. There are several main control chips below.
The charger uses Richtek's RT7786 as the main control chip.
Li Wei Technology RT7786 detailed specifications. The charging head network learned that the chip has been previouslyHuaweiThe 65W USB PD charger is used.
The primary master switch is also from Infineon, screen printing 65E6380.
The secondary synchronous rectification controller uses the MP6908 of MPS American core semiconductor.
MP6908 detailed specifications. The charging head network has learned that the MP6908 is a widely used synchronous rectification controller. It has been Lenovo Thinkplus USB PD charger PA65, AUKEY 27W USB PD charger, Lenovo 65W USB-C power adapter, DHL USB PD dual port. Charger, MOMAX 66W USB PD charger and other products are used.
The charger has been completely disassembled.
Summary of the charging head network disassembly
Google 45W USB PD charger uses a pure white body in appearance, sharp edges and corners, looks very tough, the surface of the charger is a matte-like treatment process, feels comfortable, and is more wear-resistant. Performance, this charger is the original PixelbookAccessoriesIt only supports USB PD, a fast charging protocol that supports the completed USB PD output voltage level.
The charging head network dismantling found that the material and workmanship of Google's charger are very solid. The primary adopts the main control chip of Lixin Technology, the secondary uses MPS synchronous rectification chip, the primary switching tube and the secondary synchronous rectification MOS tube. From Infineon; output protocol control is implemented using the WT6615F. At the same time, in order to improve the heating of the charger under high power conditions, the main internal heating components use a large number of silica gel and metal heat sinks, so that the heat can be uniformly diffused through the outer casing to ensure the stability of the product.