Portable small fan PD power chip

With the popularization and promotion of Type-C, the micro-USB interface is gradually being phased out in the current electronic devices on the market, and gradually updated to the Type-C interface. The micro-USB interface has been with us since it was launched in 2007.After more than ten years, he is slowly withdrawing from the stage.

The product we are evaluating today is a small fan with Type-C interface on the market. Especially in the summer in the south, small fans on e-commerce platforms are extremely popular, and many businesses sell out of stock every month.

Compared with the previous portable small fans, the power has been greatly improved with the advancement of technology, and the speed has been increased from 2000-2500 rpm to 5000 rpm, but it also brings new problems.The larger the power consumption, the faster the power consumption. The previous micro-USB interface can only provide 5W (5V1A) power charging. The charging speed is too slow and the power consumption is too fast, resulting in a very tight battery life.

In order to solve the pain point of slow charging, merchants have updated to Type-C interface, because the Type-C interface is equipped with PD protocol, and the fast charging can reach 100W, which is completely enough for small fans to charge quickly.C interface 18W fast charge input, charging for 15 minutes can blow for one hour.

So how does the Type-C interface of the small fan realize fast charging?We learned that to achieve 18W power (9V2A) charging is achieved through the PD protocol handshake. The small fan belongs to the SINK (power receiving end) in the PD protocol, and the adapter belongs to the SOURCE (power supply end).The CC pin of the C interface communicates. After the communication handshake is successful, the VBUS of the adapter end will output 18W.

The key to the communication of the fast charging protocol here is that there is a UFP chip in the device and a DFP chip in the adapter. The two chips can achieve fast charging only if the communication handshake is successful through the CC pin.

But there are various types of chargers. The common ones are PD, QC, AFC, SCP, FCP, VOOC, PE protocols. If the power-taking chip of the small fan is not compatible with these protocols, it is impossible to communicate with these protocols. Fortunately, at presentAdapters on the market basically contain a variety of charging protocols, and the power-fetching chip can communicate successfully as long as it meets one protocol!

Summary:

The PD power-taking chip tested here is LDR6328S from Lederui Technology, which is a sink controller compatible with USB PD, QC and AFC protocols.

The LDR6328S draws power from adapters that support USB PD, QC and AFC protocols and supplies power to the device.For example, you can configure the adapter to output the required power to power the wireless charger device.The LDR6328S is also compatible with legacy USB power adapters.

TYPE-C PD fast charging decoy chip, LDR6328S supports customized voltage output, it has a built-in PD communication module, and through handshake communication with the PD protocol chip of the power supply end (such as PD charger), it can apply for the required voltage to supply power to the product, Support wireless charging, high-power small appliances, smart home, drone fast charging and other products to supply power.

 

The biggest difference between PD protocol chargers and traditional QC chargers is that PD chargers use Type-C interface output. PD protocol requires CC pins, VBUS, GND, D+D- and other pins. It has dataThe transmission speed is fast, the charging current is large, the voltage is high, and it can also support USB reversible insertion, which is very convenient.

The input end of LDR6328S is a USB Type-c female socket, which is connected to an adapter.CC1 is used for USB PD protocol communication, D+ and D- are used for QC and AFC communication.

The priority of the fast charging protocol is PD>QC>AFC, that is, PD is preferred, and QC is selected if PD is not supported.Choose AFC if QC does not support it.

Part of the reference schematic is as follows: