Today's AC/DC power conversion market is changing rapidly, and everyone is well aware of it. In particular, various fast-charge agreements are emerging one after another. This is not a good news for power supply manufacturers, because they have to provide different power products according to the needs of different customers, which is a challenge for the power engineer's workload and vendor supply chain management. This inevitably makes people think: If you can have a "universal" solution, use a design to adapt to the changing market needs, and "changed" should change, then it is perfect. Don't think that this is a "brain hole" that is unconstrained. Power Integrations (hereinafter referred to as PI)'s latest InnoSwitch3-Pro offline flyback switching power supply IC is born to fill such a "brain hole"! As the name suggests, InnoSwitch3-Pro is an upgraded version of the InnoSwitch3 power IC that was introduced last year, so it naturally inherits many of the outstanding features of InnoSwitch3, such as: can provide up to 65W of output power; can be as high as under various input voltages and load conditions 94% efficiency; excellent dynamics; integrated protection features and more. However, the reason why this power IC can add a "Pro" to the name, the biggest difference is that the chip integrates an I2C interface, through which the microprocessor can be directly connected to the power IC, through the control signal to the output voltage and current Accurate dynamic step control – voltage step size of 10mV and current step step of 50mA – enables digitally programmable power conversion. Power engineers using this power supply design, coupled with a suitable microcontroller, can support virtually any dynamic fast charging protocol such as USB PD 3.0 + PPS, QC4, SCP, FCP, VOOC. Figure 1 InnoSwitch3 with integrated I2C interface for digitally programmable power conversion At the same time, in addition to the control of the output current and voltage, the "digitally programmable" feature of InnoSwitch3-Pro is also reflected in the configurable protection function. Both the response mechanism of the power protection feature and the trigger threshold for various protections can be externally set by software, which greatly increases the design flexibility of the power supply design performance. InnoSwitch3-Pro integrates telemetry technology for bus voltage, current and fault reporting, as well as over-temperature protection point (OTP) for externally settable power supply, input overvoltage/undervoltage (OV/UV) protection points, and output overvoltage/under The reaction mechanism of voltage (OV/UV) protection and short-circuit protection makes the number of BOM components of complex off-line power supplies greatly reduced, and the complexity of power supply design can be greatly simplified. Figure 2 InnoSwitch3-Pro system schematic For power supply manufacturers, the changes brought about by InnoSwitch3-Pro can be disruptive. As can be seen from Figure 3, the traditional power supply production method has to be designed separately for different specifications when dealing with the needs of a variety of different customers. For the BOM inventory of different designs, it is produced separately through multiple production lines; With InnoSwitch3-Pro, you can flexibly respond to various power supply design requirements with a single design, the same BOM, and a production line. The InnoSwitch3-Pro design requires only one safety certification to meet the power needs of multiple output specifications, which greatly saves on certification costs. This is unimaginable for traditional power supply designs. Figure 3 InnoSwitch3-Pro revolutionizes the way traditional power supplies are produced It is precisely because of this "flexibility" that the market support point of InnoSwitch3-Pro is not limited to the fast charging field. In the non-charging application, a single power supply design can realize a variety of output characteristics, which can also be better. Cost-effective, and can also be programmed according to the protection characteristics of different regions to meet the power supply design requirements of each region. Furthermore, once the power supply is shipped from the factory, if the customer has the need to change the output characteristics, the software can also use the software to change the output specifications of the power supply or set the protection characteristics, which can meet the temporary changes of the power supply of the terminal customer in a timely manner. . As Shyam Dujari, director of product marketing at Power Integrations, said: “The ability to precisely control the output voltage and current of the power supply in different application environments is also very useful for designers who need professional applications in small batches because they can use the software during production. Or easily configure the output specifications during installation to meet the power needs of different applications." In order to enable developers to experience the "dividends" brought by InnoSwitch3-Pro as soon as possible, PI has prepared a series of supporting resources, such as: Complete API library for easy object-based programming Doxygen program generator to generate high quality software reference documentation Reference design with different microprocessors to accelerate the implementation of customer products and solutions Figure 4 InnoSwitch3-Pro reference design list "In short" InnoSwitch3-Pro has developed a new way of playing in the field of power supply design. What kind of excitement can finally be realized among the power engineers, which is full of expectations.
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