With the introduction of new laptops, smartphones, and tablets, USB Type-C has become a hot topic; there are Type-C ports on these devices that can be used for charging and for connecting peripherals.
This change has increased the demand for Type-C AC/DC chargers and chargers because the Type-C connectors have user-friendly and reversible features. And more importantly, Type-C chargers and charging treasures are generally applicable to multiple laptops, smart phones, tablets, and more.
Interestingly, the configurations of these chargers and chargers are not very different from their previous generation Type-A. However, one of the key points that some charger designers may overlook is that Type-C connections require additional power due to additional Type-C circuitry. This is not just the D+/D- connection of the USB 2.0 era.
Type-C requires the configuration of channel (CC) pins to detect plug orientation, determine the purpose of the connected port, and establish additional power transfer (PD) communications when higher output voltages are required. These additional functions require more complex integrated circuits (ICs), which naturally consume more current. Currently, many Type-C solutions on the market are based on microcontroller (MCU) cores and consume high quiescent current (IQ), which is typically in the milliampere range.
However, the extra current consumption will have a negative impact on standby power consumption, while the latest power supply efficiency code of conduct (CoC) version 5 secondary requirements for AC/DC adapters specifies standby power consumption of less than 75mW—this is a Easy to achieve. In addition, if the battery pack contains a Type-C control circuit, the generated external current may even drain the battery without actually using it.
The advanced downstream port (DFP) controller design will achieve a lower IQ as a major design goal. This design type optimizes current consumption to the milliampere range. For example, the TPS25810 Type-C DFP controller consumes less than 0.7μA (typ) when no device is connected. This helps to make the AC/DC adapter's efficiency meet the required efficiency standards and to ensure that the charged Po battery has a longer hold time.
Since the advanced Type-C controller uses a low IQ design, AC/DC charger designers meet standby power requirements without adding additional control circuitry. The use of low IQ controller charging treasure can effectively extend their charge retention time, so as to provide users with a better user experience.
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