 Hello everyone and welcome to ReMeet at Digital Days. My name is Lisa Richter and I will moderate this presentation. We are very pleased that you took the time to participate in our virtual conference. The topic of this presentation is 27 Watt USB Type-C Power Delivery 3.0 with PPS Adapter Reference Design. Our speakers are from our partner ST Microelectronics, Filippo Bonacorso and Fabrizio DiFaranco. David will hold the presentation and will answer your questions. Before we start, I would like to point out one thing. You will be muted during the presentation. This means that you cannot ask questions via the microphone during the presentation. Nevertheless, you have the opportunity to ask questions during the presentation at any time via the chat function. You will find the chat function in the control panel. This presentation will be about 30 minutes long and the chat questions will be answered in a Q&A session following the webinar. There are five to ten minutes left or scheduled for this and if we are unable to answer all of your questions within this time, we will answer them via email afterwards. If you still have any other questions left, just mail us at exhibition at we-online.com and we will try to answer all of your questions promptly. At the end of the webinar, you will be asked to participate in a feedback survey. We would be pleased if you take the time to fill out the survey and help us to improve our event. You will receive the link to the presentation in the next few days and the recording will be available at our website shortly. So now I will hand over to our speakers and I wish you an exciting presentation. Okay, so we can start. So, hi everyone, my name is Fabrizio Di Franco from ST Microelectronics and first of all, let me thank you, our Booth Electronics friends, for having invited us to this digital days exhibition. Today, together with the application specialist, Filippo Bonacorso, we are going to tell you about our new reference design in power conversion, the ST Eval USB-PD27S, the 27W USB Type-C power delivery 3.0 adapter with PPS support. The solution extensively embeds in the below material Booth Electronics components for what concern passives and magnetics. So taking a closer look at the content of the presentation, we will go first shortly through the market trend, then we will move to the hardware architecture and key products overview, ST key products overview, then we will move to the firmware package structure which complements the solution. While in the second portion of the presentation, we will focus on the major IPs developed for this solution and which bring the real added value to the addressed final customer applications. We will end this presentation with some experimental results and some useful details about the full set of documentation available for this solution. The trend for C2DC power adapters for mobile devices has moved from traditional, let's say low power fixed output power supplies or mobile devices to today's higher power level, higher power density and variable output solutions including and supporting multiple communication protocols including the USB power delivery. In this trend, there is a major focus on fast charging solutions for mobile devices since their battery capacities continue to increase and charging time needs to be reduced. Now, in this trend, modern fast charging applications require more and more programmable power supply capabilities, so PPS support who makes possible for faster and safer charging without unnecessary heat and who makes also possible for the execution of specific and custom charging profiles, both cost and voltage and cost and current. So to meet this market trend, we recently launched this STVAL USB 27s reference design to address the mobile power adapters and fast charger applications as well as the outlet wall adapter applications. With an extensive technology and IPs portfolio, ST is able to offer a wide range of USB IF certified solution for USB type C and power delivery in order to support implementations in a variety of source sync and dual role devices. Specifically for source devices, so for AC to DC adapters, ST offers covers from the AC receptacle to the type C receptacle. So for the power supply stage, so for the first stage, we are offering a double approach, I mean the entry level approach with the STCH-03 PWM controller for quasi-resonant flyback topology, coupled in this case with the super junction power MOSFET. So with the MDMesh M6 series specifically optimized for soft switching topologies, but also offering high performances in hard switching topologies or the very high efficiency approach with the master gun family recently introduced into the market. The master gun, as you may be aware, is the system in package with the half bridge high voltage gate driver and two gun FETs to address high-frequency converters, such as the active clamped flyback converter or the LLC converter up to 100 watt or even higher power rating. For what concern the secondary side, so the USB type C and PD 3.0 controller, ST offers wide flexibility, let's say thanks to the MCU-based approach or thanks to the hardwired approach to implement different use cases with different power ratings. For what concern the MCU-based approach, there are, let's say, two options are available. The first option for PPS is based on the certified USB-C and power delivery STM32 microcontrollers thanks to the USB type C and power delivery interface IP, which has been introduced first with the STM32 G0 series, but now available also with the G4 series, the L5 series and the U5 series. In this case, the companion chip, the companion IC of the STM32 microcontroller will be the TCPP-0x protection, which is basically interfacing the micro with the type C port and which is providing all the protections needed for the use case, so the V-BUS or the CC-LINE protections on top of other functions such as the get-driving for the load switch and the discharge. The other option for the MCU-based is including any STM32 with the X-Cube USB PD certified software and in this case the companion chip will be the USB STU-SB-1602 type C controller. While, as I mentioned before, we have also in our portfolio the hardwired option, which will be based on the STU-SB-47 full hardware controllers. Now I leave the stage to Filippo Monacorso, who will go into more technical details of this presentation and this solution. Thank you Fabrizio, thank you everyone for joining. Let's start with more details on the STIVAL USB PD-27S. As you can see from all the key features, this is a 27 watt adapter based on STM32G0 that is compliant with type C and PD-3.0 specification and particularly the solution is able to support the programmable power supply or PPS. The board is operating from a wide range of input and is offering four PDOs, two fixed one and two programmable one, the one related to PPS. And thanks to the transformer designed jointly with Wurth, it is able to offer up to five amp output. Then the board, thanks to the firmware package, is able to support with its software IPs, many tasks driven by DMCU. So not only the power delivery communication, but also signal certification and particularly the control of the VBUS2 cop with PPS. It is compliant with COCTR2 and DOE level 6 and is able to, it has a very low standby power consumption that is less than 40 milliwatts. It is a very compact solution thanks to the 3D shape of the free PCB module used and is able to reach more than 10 watt per inch cube. So as I said before, we are offering four PDOs, two of which are PPS, Programmable Power Supply PDOs. This feature will be described later. And this mainly targeting mobile charging application. The key product of the 3D structure is shown in this picture. As you can see, we have a main board offering the main stage of the flyback converter and we have a small board that is managing the flyback converter based on the STCH03 and a digital control board where the MCU, coupled with the TCPP01 device, is managing all the stack and all the application in all its features. So not only the STCH03 as said before by Fabrizio is in charge of the power conversion, but we have also MDMesh M6 MOSFET and we have also an LDO on the main stage that is supplying all the digital control section that is based on the first MCU, the STM32G0 that is offering the PDFI with the TCPP01 that is managing the interface with the Type-C connector and there are also the MOSFET in charge of turning on and off the VBUS with other protection on the VBUS. So going into details, moving from the CE input to the Type-C output, we have the STCH03 that is a key product for flyback converters because it is offering many interesting features. First of all, the low current consumption and the low standby consumption. It offers frequency jittering to reduce the MEI and it has also an I-volt startup circuit and in the topology you said there's also a different snapper that is based not on the classical RC approach, but is based on a transit voltage suppressor. This helps the board to achieve higher efficiency, especially at light loads. The STCH03 is coupled with the STD7N65 MOSFET that is belonging to a family of a product that are mainly targeting this kind of solution, so mainly soft to switching device and it has high efficiency, especially in terms of RDS zone. Last but not least, on the primary, on the power stage, we have the LDK320 that is a high precision, high efficiency LDO that is providing, that can provide up to 200 milliamp that is supplying the all the digital control stage. The digital control stage is based mainly on the MCU that is in charge of all the tasks set before, that is STM32G0 that has a very large set of IP that are in this solution that are used jointly with software IP. So probably the most important one is the USB-PD-FI, but all other IPs are in charge of some specific action in this solution. The TCP-PO1 is in charge of the protection of the MCU because you may have such or shorts on the Type-C connector and this device is also offering other features like overvoltage protection and mainly the gate driving for the load switch, because Type-C spec implies the application to turn on and off the bus output. This is the first device of this family, but today there are coming other device TCP-PO2 and TCP-PO3 that will address main resource and the DRP application. On the V-Bus we have also another transient voltage suppressor that is in charge of protecting your application. The board as said is based on an MCU, so there's a firmware package that is based on a CubeG0 firmware package, especially for the USB-PD library that is offering also other software IPs that are managing different aspects of the application. The two most important ones are the signal certification and the programmable power supply, the V-Bus management. Let's move on with programmable power supplies. Programmable power supplies are an optional feature of PD3.0 standard and implies a precise control of the V-Bus because the charger has to change the output with 20 millivolt resolution on the voltage output and 50 million resolution on the output current. Moreover, it has to deal with constant voltage operation and constant current operation. This optional feature is very useful, especially for battery charging applications. One of the main targets of PPS is to replace the charger on a mobile device because of with PPS the sync device that could be smartphone or tablet can ask directly to the charger a specific voltage and current with the option of constant voltage and constant current to charge directly its battery without losing power in heat or losing efficiency in the combustion because everything is managed by the charger. The standard implies the use of a specific set of mandatory power data object but in this case as said before due to the features of the transformer the solution is able to provide up to 5 amp on the first two profiles which means that at 5 volt or in the first augmented PDO the solution is able to provide up to 5 amp if an electronically marked cable is used. To offer all this feature a control algorithm has been developed for the V-Bus so the this control algorithm has to deal with all the requests coming from the sync side and has to offer the bus with the resolution imposed by the spec so in this picture you can see one of the tests done with tool equipment where the voltage is changed with 20 150 millivolt step but as said before even a constant current operation is requested on the left side of the screen you can see the request from the spec the usbpd standard on the right you can see a picture acquired with the scope that is replicating the requested behavior. Anyway don't be scared because more information are available on the online documentation of the board. Another software AP that is running on the mcu is the signal certification the mcu is able to cope with the signal certification that is a feature offered in power conversion that is used to increase the efficiency and to reduce the thermal dissipation the key point of the signal certification is the use of a MOSFET instead of a diode so the key the key point of the signal certification is that the MOSFET is controlled to work as a diode doing so you don't have you are gaining in efficiency because lower dissonance MOSFET is used instead of a diode so the key point is to increase the MOSFET conduction point to increase the efficiency. So in the classical flyback topology when the VDS on the secondary side is going down that means that the ideal diode should start to conduct the MOSFET is turned on to reduce the the resistance on the bus and it is turned off when the current is approaching zero anyway there are a blinking windows offered that turn on and turn off to avoid noise to avoid false triggering but at the end the algorithm has to maximize the MOSFET conduction time to do so there is a patented algorithm that is acquiring the voltage on the on the MOSFET just after the turn off and on the basis of the voltage at the turn off is able to detect if the conduction time of the MOSFET must be increased or reduced even for this there are there is a specific application note that is describing how to implement the signal circuitification on a flyback converter. Let's move on with all the experimental result of the board first of all we can see the output voltage regulation in case of dynamic load variation in this picture acquired with the scope we can see how the board is controlling the V-bus when the current is switching from zero to the full load at tenets so the output is well inside the requested spec from usb power delivery the flyback topology put in place uses a 650 volt MOSFET on the primary side and a 100 volt MOSFET on the secondary side so you can see that the volts on the primary side MOSFET and the secondary side MOSFET are well below the maximum voltage available. The signal circuitification algorithm behavior is shown in this picture the pink one is the voltage on the primary side MOSFET while the yellow one is a translation in the MCU domain of the secondary side MOSFET voltage so you can see that once the primary side MOSFET is turned off the secondary side one is turned on and you can see in blue the PWM that is turning on the MOSFET that is directly generated by the MCU and is controlling the super low level MOSFET. The power efficiency as said is in line with the COC TR2 and the OE level 6 requirement and last but not least even the MEI are well inside the mask and this is also due to the specific design of the transformer that is offering a double shielding approach. All the experimental results are hosted inside an application note the board is compliant with all the USB PD spec but we can say that it is almost certified because we are waiting for the official communication from usb.org so the board will be certified as 27 watt power brick and the MCU will be certified as source with pps support. Then additional information if you buy the board you will find this blister with or with the stable USB PD 27s with an ST link programmer that is the tool that can be used to program and to play with this solution. Don't be scared because we are rich of documents describing the board and describing how to deal with USB PD and with all the programming tool. Now I leave the stage again to Fabrizio for a final conclusion. Okay so trying to summarize ST has recently launched this USB type C and power delivery 3.0 reference design with pps support to accelerate the design of easy to use efficient and compact power adapters up to 27 watt with basically zero power when no cable is connected. As a takeaway first of all the solution is based on the MCU approach so it is based on the STM32G0 microcontroller and this is giving the flexibility to follow up the evolution of the power delivery standard and at the same time to implement additional application layers such as the synchronous certification. Then as shown during the technical portion of the presentation specific algorithms have been developed to control and to regulate the VBUS on the secondary side to reach the compliance with the power delivery and the power delivery standard and the pps specification and the microcontroller is also used to control the synchronous certification as mentioned with a unique adaptive algorithm basically. For what concern the performance is so for the energy for the power compression efficiency we reached the target of the compliance with the most stringent energy saving recommendations both for what concern the let's say city-state efficiency but also for the standby so the no load power consumption which is actually less than 40 milliwatts. So I think that's it for the presentation thanks a lot for your attention and then we can move to the Q&A session. So thank you very much, yes like you already mentioned we can go now to the Q&A and therefore everybody has the opportunity to ask questions via the chat function in the panel. So let's have a look maybe a first question which is the converter topology used? So in this case for the power stage so for the converter we are implementing a quasi-resonant flyback converter so single switch topology very simple but at the same time efficient and combat so the answer is quasi-resonant flyback converter. Okay great then another question which device allows the QR flyback converter control? Yeah in this case we are using the STCH-03 PWM controller which is also offering the primary side the constant current feature while the the constant voltage is implemented on the secondary side so STCH-03 PWM controller. Okay then there is another question does DavioKontek have any solution for power over ethernet? Okay yes of course in our portfolio we do have controllers for the power over ethernet addressing the latest standard so up to seven button and even more so the portfolio is including both PoE interfaces with the active bridge and the hot spot controller and also the PoE let's say the PWM controller for implementing the power conversion from the 48 volt to the desired output voltage specifically for the power delivery combined with the PoE standard we do have it in our roadmap so in our roadmap there is this reference designed to address up to 100 watt usb power type c and power delivery applications with PoE as a main protocol for the for the supply voltage let's say. Okay then there is a question yes first of all thank you I think I lost the drift of transient response time could you mention it again? Okay the all the response time especially for the voltage transition are all in line with the usb PD spec I don't have it in mind right now but you can find it on the documentation available online. Okay great then another question which devices allow the PD protocol implementation? Okay the PD protocol implementation is based on two items the first one is the usb PD5 that is an hardware IP on the stm32 g0 mcu that is joined with the usb PD library available on the stm32 cube g0 that is the firmware package for the mcu and the the library is dealing with all the item related to the usb PD standard. Okay and then maybe a last question what's the meaning of pps which is its use? PPS means programmable power supplies and this is the optional feature described before that is offering the the smaller resolution on the b-pass and on the on the current from a 3.3 volt up to the maximum voltage available on the board. Okay so thank you both of you this was really great thank you for having you here today and thank you all for your attention I hope you enjoyed the presentation so the next presentation topic is make electronics autonomous and powered from environment and the presentation starts at five hopefully see you there and enjoy the digital days so goodbye. Thank you thank you very much bye bye have a good day.