TINA/Spice/LM5050-1: Off pin is not functioning as per specs in TINA

Vishal Kakade

Part Number: LM5050-1
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello,

I am enabling the OFF pin of LM5050-1 from an FPGA whose I/O voltage level is 1.8V.

Now as per the datasheet, Threshold for OFF pin is 1.75V. I am trying to simulate the circuit in TINA but Off pin is not responding at (any voltage between 0 and 5V).

Even after applying 5V to off pin, mosfet is still on. Can you please check this?

Regards

Vishal

over 6 years ago

0 Karikalan Selvaraj over 6 years ago

TI__Genius 16305 points

Hello Vishal,

Were you able to check the MOSFET is OFF by looking at the gate of MOSFET or were you monitoring the output after MOSFET?

Because MOSFET, even if OFF, its body diode would conduct and will see the input voltage minus body diode drop.

Regards,

Kari.

0 Karikalan Selvaraj over 6 years ago in reply to Karikalan Selvaraj

TI__Genius 16305 points

Hello Vishal,

Let us know if you were you able to check the above question?

Regards,

Kari.

0 Karikalan Selvaraj over 6 years ago in reply to Karikalan Selvaraj

TI__Genius 16305 points

Hello Vishal,

Could you let us know if have yet gotten a chance to look at my response.

Regards,

Kari.

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TINA/Spice/LM5050-1: Off pin is not functioning as per specs in TINA