TLV62090: Why not fill copper...

wolver wang

Prodigy 90 points

Part Number: TLV62090

TLV62090 demo PCB not fill copper at bottom of inductor, Why?

over 7 years ago

0 Emmanuel Granatello over 7 years ago

TI__Expert 3465 points

Hello dear user,

I'm sorry but I can't understand your question. Would you elaborate a bit more ?

Thanks and regards,
Emmanuel

0 wolver wang over 7 years ago in reply to Emmanuel Granatello

Prodigy 90 points

hi: Emmanuel

In my PCB, I fill copper with GND at bottom of inductor, I think that can reduce inductance radiation for EMC...

But Somebody think that reduce value of L(Q), And make radiation interference to the ground, It's bad for buck...

I find TLV62090 demo PCB also not to fill GND copper at bottom of inductor, I want to know why?

0 Emmanuel Granatello over 7 years ago in reply to wolver wang

TI__Expert 3465 points

Hello user,

the ground plane below the inductor could act as an antenna, and depending on the polarization of the magnetic field generated by the inductor, it could catch noise and inject into the board's ground path. Not a good thing at all. For the same reason, our EVM do not have ground below the inductor on the top layer.

Regards,
Emmanuel

0 wolver wang over 7 years ago in reply to Emmanuel Granatello

Prodigy 90 points

hi: Emmanuel

3QY!

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TLV62090: Why not fill copper...