LM76003：I need you to check if the schematic is OK.

?? ??

Prodigy 40 points

Part Number: LM76003

■Conditions
Input voltage: 48V
Output voltage: 42V
Output current: 2.4A(MAX)

Is CFF required?
The result of the calculation using the formula in the specifications is a large number, over 100pF.

over 1 year ago

+1 Andy Chen over 1 year ago

TI__Mastermind 27045 points

The Fsw is about 2MHz which is too high for 48V to 42V because of Toff-min limitation and thermal issue.

Pls check if 400KHz workable for you

B R
Andy

0 ?? ?? over 1 year ago in reply to Andy Chen

Prodigy 40 points

Andy.

Thank you for your response.
I have an additional question about the heat dissipation design.

My question is based on the RθJA vs Copper Area graph in the specification sheet. (P.44)

Example) 4-layer board
Am I correct in understanding that RθJA will be approximately 19°C/W if the total area of GND from layer 1 to layer 4 is secured to be 40 mm x 40 mm or more?
Or is a GND area of 40㎜×40㎜ required for each layer?

+1 Andy Chen over 1 year ago in reply to ?? ??

TI__Mastermind 27045 points

It's the GND area required for each layer, i.e, the board size is 40mmx40mm

B R

Andy

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LM76003：I need you to check if the schematic is OK.