Hi Team,
Good day, I received query from customer regarding this device. For me to not miss any information, Ill copy query below.
"
. I have a problem with testing LM5069. It was decided to use this IC in couple with a MOSFET as a electronic fuse, which turns off the cirquit at overvoltage and overcurrent. I used TI's calculator to determine cirquit parameters. Rated voltage is 24V, maximum allowable voltage is 30V, maximum allowable current is 12A.
Now I trying to test a prototype. Unfortunately, I have no power supply unit rated at 12A. To quick test the IC, I decided to change a value of current limiting resistor. Instead of 0.004 Ohm I'am using 0.04 Ohm resistor.
When output is shorted, the voltage on source is falls down but MOSFET is still opened a little bit. So there is no a proper switching off.
I am attaching figures with an original shchematic (Both 0.002 Ohm resistors are replaced by 0.02 Ohm ones) and oscillogramm with gate voltage, source voltage and timer pin voltage
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Thank you and looking forward for your kind response.
Regards,
Maynard