In recent years, the development of the USB PD charging technology has had a huge impact on portable PC devices. Apple, Xiaomi, Huawei, Lenovo and other manufacturers have introduced a variety of laptops that support USB PD charging.
Recently, the domestic PC giant Lenovo Lenovo has introduced a USB PD charger with an output power of 45W.
Below to share the dismantling of this charger.
One, Lenovo USB-C charger out of the box
The packaging is very simple, consistent with Lenovo's peripheral series.
The back is related parameters. Model Number: LS-45WTCPD Input: 100-240V 50/60Hz 1.5A Output: 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/2.25A. produce.
Internally separate two sections with cardboard and place power adapters and C-C cables respectively.
All the accessories in the box.
Lenovo's USB-C Power Adapter comes in a square shape. It's very similar to Xiaomi's 45W USB PD power adapter with no cable. The appearance of the color is black, and the surface has imitation skin coating.
The top of the power adapter has a Lenovo white silk screen logo and a Type-C output socket.
AC plug is a foldable plug for easy storage and carrying. Nameplate content: Lenovo USB-C power adapter (45W); Model number is LS-45WTCPD; Input is 10-240V 1.5A; Output is 5V/3A, 9V/3A, 12V/3A , 15V/3A, 20V/2.25A; The manufacturer is Diwa Enterprise Co., Ltd., which is produced by Lenovo (Beijing) Co., Ltd.; Charger S/N: SH8028ND, The charger has passed CCC certification and meets Class VI energy efficiency standards. There is a 'Designed by Powerland' on the charger. It is known that Powerland Chinese is named Boland, and Nanjing Boland Electronic Technology Co., Ltd. is an independent subsidiary of Quanhan Group, a world-renowned power supplier.
Height is about 57mm.
The length is about 59mm.
The width is about 28mm. The overall size is very close to the millet 45W (without line) USB PD power, but the two are not the same mold, and Lenovo LS-45WTCPD shell should be slightly smaller.
Weight 106g.
The attachment is a 1.5m length C-C cable. The appearance and overall workmanship are good.
Type-C plug is also full needle design.
Second, the Lenovo USB-C charger test
The USB PD protocol message was tested using the ChargerLAB POWER-Z KT001 and was displayed as 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/2.25A. The results are consistent with the power adapter marking.
Lenovo this charger in addition to supporting USB PD protocol, also supports QC2.0, QC3.0 fast charging protocol.
USB PD protocol 5V, load can be pulled up to about 3.5A.
USB PD protocol 9V file, the load can be pulled up to about 3.5A.
USB PD protocol 12V file, the load can be pulled up to about 3.5A.
USB PD protocol 15V, load can be increased to about 3.2A.
USB PD protocol 20V, load can be pulled up to about 2.3A.
Power supply to millet Air laptop, output 19.9V/1.94A, charging power about 39W.
The purple rice 10 mobile power supply can output 14.9V/2.64A, the power is about 39.3W.
The Lenovo USB PD mobile power supply, can output 8.87V/1.64A, charging power of about 14.6W.
Power supply to the Nut Pro2 mobile phone, which can output 8.94V/1.72A, charging power about 15.3W.
Third, Lenovo USB-C charger dismantling
Dismantling starts with the AC plug face and opens the cover.
The PCB is positioned and fixed by two chutes inside the housing.
From the top view of the component surface, two heat sinks with yellow insulation tape are visible. The entire PCB is in an 'L' shape, and the gap is used to place the AC folding plug assembly.
AC input protection and EMI circuits include fuses, X capacitors, common mode inductors.
The full-bridge rectified primary-side filtering power supply is a 82μF/400V capacitor from SUSCON (Taiwan Guankun). From this point of view, NTC vacancies belonging to the protection circuit are not installed.
Next to the insurance is a blue Y capacitor with a magnetic ring on the foot.
The secondary side low voltage output filter is two solid capacitors, and the Type-C output mother seat is mounted on an independent PCB board.
After removing the heat sink, the switch transformer has a DVE logo, and the two solid-state filter capacitors are 680μF/25V.
The primary side switch is TK10A60W, N-MOSFET, from Toshiba.
TOSHIBA Toshiba TK10A60W short specifications.
The other common schottky pair on the heatsink is marked with a shallow and fuzzy marking. The symbol is LT 7B37 G40H100CTW. This Schottky tube is used for secondary side DC rectification. The power supply does not use the SR that is currently widely used. Program.
Since no SR technology is used, there are few PCB backplane components, mainly the upper left LD5760E. The PWM controller from Tongjia Technology and the aforementioned Toshiba TK10A60W make up the primary circuit. The lower left white device is the CT1019 optocoupler. For voltage feedback.
Tong Jia Technology LD5760E main features.
The Type-C output is an independent PCB board with plastic sleeves for insulation and positioning.
After separating the plastic envelopes, it can be seen that there are ICs and MOSFETs on the PCB board.
The 14-pin IC is Weltrend WT6632F, which is a USB PD controller from WeiQing. It also supports QC2.0 and QC3.0 protocols. The pink box is a patch MOSFET silkscreened with B3115 for Vbus switching.
Weltrend explains the main features of the WT6632F.
On the back of the board there are only some devices such as resistors and capacitors. The dismantling is introduced here.
Dismantling summary
Lenovo's LS-45WTCPD USB-C charger was commissioned by Divine Enterprise Co., Ltd. With 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/2.25A five PD output modes, compatible with QC2.0/3.0 protocol , The output power is enough, and the actual test has good compatibility with various USB PD devices.
From the dismantling point of view, The charger uses Leadtrend's LD5760E primary PWM chip internally, while the secondary uses Weltrend WT6632F as the USB PD controller. It also has a full range of materials. At the same time, it also maintains the excellent workmanship of the Tesla series power supply. More than 45W PD power, it is a good choice.
