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STNRGPF12: Why is GND_BRG_SW connected to V_INPUT ?

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Neelsk74
Associate

‎2026-05-18 5:38 AM - last edited on ‎2026-05-18 8:21 AM by

To whom it may concern:

I am looking at your STEVAL-IPFC12C1 evaluation board schematic and there is a part that doesn't make sense to me.

Why would "GND_BRG_SW" be connected to V_INPUT? Are you not connecting low voltage line to a high voltage line?

Neelsk74_0-1779107750049.png

Neelsk74_1-1779107814793.png

 

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Peter BENSCH
ST Employee

‎2026-05-18 8:20 AM

Welcome @Neelsk74, to the community!

Your question refers to a board which, like the corresponding device, has unfortunately already been discontinued, so in principle no one at STMicroelectronics can help you any more.

However, if I remember correctly, VCC_BRG_SW was an auxiliary voltage that was more positive than V_INPUT, so that it could be used to control the gates of Q102 and Q103. At the top of the page with figure 8 from the UM2537, from which you apparently copied the schematic excerpt, you can find the two gate drivers that switch this small auxiliary voltage onto the gates via the pnp bipolar transistors Q100 and Q101.

Does this answer your question?

Regards
/Peter

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Peter BENSCH
ST Employee

‎2026-05-18 8:20 AM

Welcome @Neelsk74, to the community!

Your question refers to a board which, like the corresponding device, has unfortunately already been discontinued, so in principle no one at STMicroelectronics can help you any more.

However, if I remember correctly, VCC_BRG_SW was an auxiliary voltage that was more positive than V_INPUT, so that it could be used to control the gates of Q102 and Q103. At the top of the page with figure 8 from the UM2537, from which you apparently copied the schematic excerpt, you can find the two gate drivers that switch this small auxiliary voltage onto the gates via the pnp bipolar transistors Q100 and Q101.

Does this answer your question?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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