CRD-02AD09N PFC drawings?

Inari

Found the CRD-02AD09N application note document and I would like to ask for the better readable drawings for Figure 35 to 37 referenced on page 37 of this document.

I am an freelancer electronics enthusiast and I would like to take a closer look at it in order to improve my simple PFC.

Has Cree / Wolfspeed published any other similar documents? If so, maybe I could get references to them as well.

I am very interested in using the C3M0065090J what I have, in my PFC controller, referenced also in this mentioned document.

In my existing project, based on an analog controller MC33262, Critical Conduction Mode Topology. At least I would be very, very grateful if I could find tips on how I can use the SiC MosFET together with this outdated MC33262 controller. In my previous solution, this controller has worked good at my design. PFC worked with minimum controller operating frequency at a maximum input voltage of 275V is 25kHz and the maximum controller frequency is 62kHz at a minimum input voltage of 185V, I use STmicroelectronics STP13NM60N MosFET and BYC8-600 diode in PFC output but because Si-MosFETs with good performance are not very available I would like to modify this existing design to SiC. C3M0065090J seems very suitable for improving my PFC performance. My current PFC solution has a power of about 400-450W, if I could double it in the SiC solution, I would be very happy as an amateur designer. In this current, justified circuit, I use STmicroelectronics STP13NM60N MosFET.

I have some C3M0065090J SiC MosFETs, and probably suitable gate drivers from Skyworks - specifically the SI8271DB that I would like to use. But I feel a little stuck alone in connecting them together - how do I do that? Maybe Cree/Wolfspeed have published any application note for tips on using a SiC transistor in these kind of projects? However, this is my first SiC project and I would be grateful if I could get tips.

Thanks for taking the time.

SiC_Power_Admin

Hello Inari - thank you for posting . We do have an updated design with a DSP at https://www.wolfspeed.com/crd-03600ad065n-l/ but I see that you want to reuse your existing design with an analog controller . May we ask what the target application is ?

In the meantime, I will assign this post to one of our applications experts.

Inari

Thank You!

I'm looking into it too, but it seems much more advanced than my now obsolete onsemi MC33262 solution. My existing PFC is for an audio device, to a class D amplifier, but the main concern is that I have to use independent power supply with their independent PFC for each channel, insufficient PFC power capacity prevents the use of one power supply. The power that obviously solves the problem could be somewhere to 1kW.

The power supply itself is a simple half-bridge switch PWM based on Texas uc3825 + Si-MosFETs.

As I do not have experience in using digital solutions or the necessary tools, I would rather stick to analog solutions.

As a mentioned modificating of my existing solution, I meant that I have no problem creating a new PFC module, there is no obstacle but I am concerned to connecting things correctly together - If I have a signal from the output of the PFC controller to the gate of the PFC stage power MosFET but if I use SiC MosFET instead of this conventional silicon transistor, then obviously its driver is unavoidable? I have referred to C3M0065090J transistors to test couple of times... but I would not like to burn them out of stupidity, so I will try to find examples of schematic switching of PFC driver, gate driver and SiC MosFET.

The main concern is that since I have no previous experience with SiC, I am concerned about driving this SiC MosFET - I believe I have not understood exactly how to control it with the gate driver.

Again, I have no problem making a completely new PFC, but since I don't have any experience or tools to work with digital solutions for main power stages, my only option is to work with analog controllers, or just make the existing solution better.

Iris

Hi Inari,

Thanks for your attention!

I got to know that you are more focus on how to connect the gate driver and MOSFETs. As you know, the SiC MOSFETs have a higher dv/dt. So the gate drive schematic design and PCB layout are all very important to the final operation performance. The gate driver schematic design mainly contains two parts: gate driver selection, bias power supplier for gate signals (15V and -3V are recommended). Next to the PCB layout, it’s highly important to avoid gate oscillation. I’m attaching a file about “Gate Driving and Design Considerations for Wolfspeed Gen3 MOSFET”. It’s helpful for a SiC MOSFETs beginner. Also, the two TPPFC reference designs(CRD-02AD09N and CRD03600AD065N) are both good resource about gate driving.  Please let me know if any questions!

Gate Driving and Design Considerations for Wolfspeed Gen3 MOSFET.pdf

Inari

Thanks, Iris

It is the driving of SiC that seems worrying, I formulated my questions a little wrong initially and also some complex understanding from a language perspective. But You understood what I meant

It is this document, as You also point out, that CRD-02AD09N seems to be a very suitable solution, at first it seems that I could use it quite successfully as a basis for my project. Because it's an analog design and easier for me to use some part of it at home. I am asking again about the schematic diagrams referred to in section 11 of the same CRD-02AD09N document - these drawings would still be in better resolution, I do not read many of the details in page 37.

I do not intend to use the material for personal business gain in any way. For my own use only and for some educational purpose - to develop my hobby. If there are better resolution diagrams on page 37 of this document Figure 35: Power Board Schematic and Figure 36: Controller Board Schematic. You can also send these materials to my e-mail, I am very grateful!

Iris

Hi Inari,

I have sent the schematics of CRD02AD09N by email. Please find and review them for your reference. Hope that can help your design with SiC. Thanks!

Inari

Thank You!

I received the materials. If I have any questions, I will write.

Thanks again.