LT8390 too hot

gest on May 2, 2022

Category: Hardware

I have designed a Buckboost converter that converts from 48V to 59V with a current of 50A with CC/CV but in an open circuit at the output the LT8390 gets too hot and has a comsumption of 280mA. Any idea of the possible error?

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ron.p
May 4, 2022 in reply to gest +2 verified
Hi gest,

Please make sure to follow layout guidelines on page 26 of the datasheet. You may also copy the layout of the demo board.

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0 Jhun

on May 4, 2022 12:11 AM
Hi Gest,

Can you provide your schematic? You can verify your design through LTpowerCAD and LTSpice to make sure that your design is appropriate to the specs.

Regards,

Jhun
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0 gest on May 4, 2022 7:06 AM in reply to Jhun

this is the schematic, the components were selected according to datasheet and LTpowerCAD.
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0 Jhun

on May 4, 2022 8:45 AM in reply to gest
Please send the LTSpice file simulation of your circuit.

Regards,

Jhun
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0 gest on May 4, 2022 9:42 AM in reply to Jhun

The simulation works properly but in the final circuit the LT8390 gets too hot and finally the part breaks.

7673.asc
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+1 ron.p

on May 4, 2022 11:44 PM in reply to gest
Hi gest,

Please make sure to follow layout guidelines on page 26 of the datasheet. You may also copy the layout of the demo board.
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+1 ron.p

on May 4, 2022 11:44 PM in reply to gest
Hi gest,

Please make sure to follow layout guidelines on page 26 of the datasheet. You may also copy the layout of the demo board.
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