UCC28180: Mosfet is getting failed and load is flikkering

Naveen G1

Part Number: UCC28180

I am using UCC28180D single channel gate driver to drive 700W LED module (Output Voltage 375 to 390). We are implementing non inverting driver configuration as in application note (Fig 25 in datasheet) to drive mosfet SJMN20N60CT.

The problem i am facing is that the mosfet is getting failed if i connect the load for around more than 1 hour and even the load is flikerring between 250V to 260V AC.

Please help me.

over 5 years ago

0 Sonal Singh over 5 years ago

TI__Expert 6080 points

Hello Naveen,

Could you please attach the Vds waveform across the FET and the output voltage waveforms for better understanding.

Regards,

Sonal

0 Naveen G1 over 5 years ago in reply to Sonal Singh

Prodigy 110 points

Hello Sonal,

Previously with single mosfet everything is fine. But with 2 mosfets connecting in parallel , the load is flickering.

Now i have changed the mosfet to 17N80, with 2 mosfets now it is working fine.

Can you please let me know what may be the problem with the mosfet SJMN20N60CT in parallel connection ?

Regards,

Naveen G

0 Sonal Singh over 5 years ago in reply to Naveen G1

TI__Expert 6080 points

Hello Naveen,

I was unable to find the SJMN20N60CT datasheet online, can you please provide me with a pfd for the mosfet spec.

Regards,

Sonal

0 Naveen G1 over 5 years ago in reply to Sonal Singh

Prodigy 110 points

SJMN20A60FD.pdf

0 Sonal Singh over 5 years ago in reply to Naveen G1

TI__Expert 6080 points

Hello Naveen,

The SJMN20A60FD MOSFET has a much lower Power dissipation rating 35W than the 17N80C3. I am not sure what the exact part number is but even then the SPP can withstand 208W and SPA can withstand 42W. This ex[palins the fets failing at higher line and load conditions.

Regards,

Sonal

Power management

Power management forum

UCC28180: Mosfet is getting failed and load is flikkering