Part Number: UCC28063A
My customer plan UCC28063A design 600W SMPS.Currently has MOSFET damage when start up PFC. I think is noise interfere control card(UCC28063A), since we use wrap up inductor with copper and wire to GND. improve MOSFET damage issue, but issue still occur at VAC 90V input.
Below is my customer schematic and PCB file. Can you help review or recommend as below layout placement? thanks.
ATS600-P050 _ Power Board.pdf
ATS600-P050 _ IC Board.pdf
Hello Kuo Duke,
The schematic shows a short across the overcurrent resistors (R14)Is this correct?
Also I notice is that the power section has no series resistors on the MOSFET gates.
These are located on the plug in control card. Normally R42(R47), R34(R46) and D13(D15) are located close to the MOSFETS
This is to prevent noise pickup and parasitic high frequency oscillations on the gates. To see if this is a problem you could cut the trace on the gate and insert a small (10 Ohm) resistor on each gate.
The failures are occurring at startup so perhaps the MOSFETS are turning on during the inrush time.
Also you could add a 10uF cap on pin 6 of the connector CON10. Follow this with a 10 Ohm resistor and a 1uF ceramic on VCC of UCC28063A
Sometimes noise can enter the controller through VCC
Hope this helps
In reply to John Griffin1:
Thanks for your recommend. Check R14 is ok and I'll verfication gate resistor. thanks.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.