L6699 Enhanced high voltage resonant controller. App Note AN4027 - Question on L6699 timing circuit.

[FBaro.11]

This App Note is identified by the following meta-data:

Identifiers: AN4027, Doc ID 022604 Rev 1

Title: "12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000"

Author: Claudio Spini.

Date: July 2012

Hello Sir/Madam,

Question 1: The schematic on page 12/38 shows a connection between D16K & R34. (Note: D16 anode is connected to L6699 pin 3, CF). That connection is marked "connection made by re-work". I seek an explanation as to why this connection was done.

Question 2: Several components on the schematic are marked "N.M.", eg: D16, C43. What does "N.M." mean?

Many thanks!

Edit 02-Dec-2020: Added image below, the relevant portion of the schematic.

[FBaro.11]

Update 26-Apr-2021: This comment has been deleted, as it has been posted as a new question here:

https://community.st.com/s/question/0D53W00000jlWV8SAM/l6599at-gate-drive-pulses-appear-unexpectedly

Regards,

-F.Barone.

[Cristiana SCARAMEL]

Hi @FBaro.1​ ,

please open a new topic in the Power Management section

As above mentioned I am not in charge of resonant controllers, but if you post in the right place some others Community members can help you.

Have a nice day.

[FBaro.11]

Hi @Cristiana SCARAMEL​ ,

thanks for your reply, as per your advice I have posted a new topic in the Power Management, here is the link:

https://community.st.com/s/question/0D53W00000jlWV8SAM/l6599at-output-gate-drive-pulses-appear-unexpectedly

Regards,

Fabio Barone.