SMPS: Shielding the switching node from sensitive controller pins?

cupoftea · Feb 5, 2022

Hi,

In the following type of SMPS,

https://www.murata.com/products/productdata/8807037992990/oki-78sr.pdf?1613964620000

.. part of the inductor contains the switching node..so do they put copper plane shielding in an internal PCB layer between inductor and control circuitry?

FvM · Feb 5, 2022

I'd ask the question for circuits under design, not for products with unknown controller circuit and PCB layout.

dick_freebird · Feb 5, 2022

I have seen poor pinout architecture cause subharmonic switching
when a "fellow traveler" of the output (SW) node was placed next
to a pin that set the current mode compare level. We redid the whole
pinout and a fair bit of relayout for that one.

I imagine you could make the same mistake in PCB routing, though
have an easier time of fixing it.

SMPS: Shielding the switching node from sensitive controller pins?

cupoftea

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dick_freebird

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SMPS: Shielding the switching node from sensitive controller pins?

cupoftea

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