Zhuhai Zhirong has recently released a SW5208 wireless charging receiver chip, which provides a comprehensive solution to meet the growing demand of the wireless charging market. The chip supports 5W of output power and integrates a full-bridge synchronous rectifier, LDO, and modulation circuitry to achieve a highly integrated single-chip design. This innovative product is designed to provide users with a more convenient and efficient wireless charging experience.
The popularization of wireless charging has greatly facilitated the charging needs of consumers, not only has good compatibility in use, but also has great application in waterproof and airtightness.
Product diagram
The front of the PCBA module is soldered with USB-C receptacle, SW5208 receiver chip, output pin header and VBUS switch tube. The back is covered with tin, so that the board can dissipate heat faster.
Datasheet
SW5208 is a wireless charging receiver IC that complies with the Qi standard.
The chip features a high-efficiency full-bridge synchronous rectifier and a high-power LDO.
The SW5208 supports output up to 5W and withstand voltage up to 18V.
The chip also integrates Qi-compliant communication functions and a 12-bit high-precision ADC.
SW5208 has perfect protection mechanisms, including rectifier overvoltage, rectification undervoltage, NTC overtemperature and chip overtemperature protection.
Solution analysis
Zhirong SW5208 is a single-chip highly integrated wireless charging receiver chip, which supports 5W output power, which can meet the application of TWS earphones, electric toothbrushes and other low-power occasions.
It adopts QFN4*4-24 package, which is very comprehensive. It supports status display and wired power supply switching control, and the peripheral components are very simple.
The transistor acts as a transfer switch for wired power supply.
The length of the board is in 2Around 43cm.
The following tests are all from the test information provided by the charging head network.
Efficiency test
On behalf of the well-known wireless charging brand products on the market such as Pinsheng, Greenlink, Baseus, etc., the DC power supply was used as the power supply in the experiment, and the receiver of SW5208 was accurately placed on the surface of the wireless charging coil to ensure that the center was aligned and kept at a distance of 3mm. Connect the output of the SW5208 to the electronic load in steps of 0 A by increasing the electronic load current incrementally from 0A to 1A1a. An oscilloscope is used to record the input voltage, current, and output voltage and current of SW5208 under different current conditions, and the efficiency is calculated.
Using Pinsheng wireless charger, the conversion efficiency of 5V1A is 6686%, the peak conversion efficiency occurs at 04A output, the efficiency reached 7377%。
With Baseus wireless charger, the conversion efficiency of 5V1A is 6385%, the peak conversion efficiency occurs at 05A output, efficiency reached 6939%。
Using the Greenlink wireless charger, the conversion efficiency of 5V1A is 6407%, the peak conversion efficiency appears at 05A output, efficiency reached 6837%。
Using the wireless charging solution designed based on Zhirong SW5006, the conversion efficiency of 5V1A is 6989%, and the peak conversion efficiency occurs at 04A output, the efficiency reached 7753%。
Temperature rise test
Place the Pinsheng 15W wireless charger and the receiver of the SW5208 in a windless environment, with the Z-axis distance of 3mm and the center aligned. The load current is from 01a starts with 01a is a step, increase to 1a, and record the chip temperature and calculate the temperature rise when the temperature is stable.
Through the temperature rise test, it is verified that the temperature rise of SW5208 is 25 under the load condition of 1A1. Significantly lower than the temperature rise standard of 40.
TX compatibility testing
The wireless charger is powered by DC power supply, Z=3mm, and the maximum offset distance of X,Y that the receiver of SW5208 can communicate with the wireless charger under the conditions of light load (10%), medium load (50%), and heavy load (100%);And if the receiver of SW5208 is repeatedly placed on the wireless charger under full load conditions, will there be no ping.
Through the offset test and repeated placement test with different models of wireless charging, the receiver of SW5208 can work normally and stably every time it is placed.
Summary
The SW5208 wireless charging receiver chip launched by Zhirong Technology is a highly integrated and comprehensive product. It is suitable for embedding in portable devices to provide convenient wireless charging capabilities. The SW5208 integrates all the functions of wireless charging reception and supports flexible configuration to meet the needs of a variety of applications. With perfect protection function and coil high and low temperature protection, it provides safety guarantee for the product, and is a competitive single-chip wireless charging receiving chip.