Announcements

Live Webinar: Solving the challenges in xEV power conversions | March 7 @9am & 5pm CET. Register now!

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
Johnsoncheah
Level 1
Level 1
5 sign-ins First reply posted First question asked

Hi Team,

Customer had IMW120R060M1H to replace wolfspeed C2M0080120D.

Customer have questions below question would like to clarify.

  • From the graph below, the gate resistor is 100ohm. The negative current is around -0.8A. However, the MOSFET is very hot. They have tested with 10ohm gate resistor, but the negative current up to -2.3A observed. Will negative current spike of 2.3A cause any reliability issue to the SIC MOSFET?
  • What is the max negative current the SIC MOSFET can sustain?
  • If the negative current will cause reliability issue, how to improve the ringing?

The brightness below refers to the load level. 100% Brightness = full load, 10% Brightness =light load

Customer is using flyback controller to drive the SIC MOSFET.

MOSFET Waveform (Ch1=Vds, Ch2=Vgs, Ch4=Ids)

Fig.1 : 100% Brightness

Johnsoncheah_0-1665129058053.jpeg

 

Fig.2 : 40% Brightness

Johnsoncheah_1-1665129058056.jpeg

 

Fig.3 : 30% Brightness

Johnsoncheah_2-1665129058057.jpeg

 

Fig.1 : 20% Brightness

Johnsoncheah_3-1665129058059.jpeg

 

Fig.4 : 10% Brightness

Johnsoncheah_4-1665129058061.jpeg

 

 

Schematic (Output 350W 500V 700mA)

Johnsoncheah_5-1665129058067.png

 

0 Likes
1 Solution
AZIZ_HASSAN
Moderator
Moderator
Moderator
5 likes given 250 sign-ins 100 solutions authored

Hi,

Thank you for posting at Infineon community.

1) Can you please share the complete schematics especially gate circuit and secondary side circuit.

2) May I know why did you put C3 of 10Pf .

BR,

AZIZ HASSAN

 

View solution in original post

0 Likes
3 Replies
AZIZ_HASSAN
Moderator
Moderator
Moderator
5 likes given 250 sign-ins 100 solutions authored

Hi,

Thank you for posting at Infineon community.

1) Can you please share the complete schematics especially gate circuit and secondary side circuit.

2) May I know why did you put C3 of 10Pf .

BR,

AZIZ HASSAN

 

0 Likes
AZIZ_HASSAN
Moderator
Moderator
Moderator
5 likes given 250 sign-ins 100 solutions authored

Hi,

Can you please update the status.

BR,

AZIZ

0 Likes

Hi,

Any updates please.

BR,

AZIZ 

0 Likes