If you read my question, I say: "The output of this driver goes to the board that I'm developing." I can't change the original board itself, but in my new board I have access to the output signal from that board, the supply and GND.

@jonk That's correct. As I said in my question, the above circuit cannot change. The output of that circuit goes to the board that I'm developing. If V2 is a PWM, I get a 24 V PWM between the supply and the output connection. My question is then: how can you get a DC voltage from that PWM? With a low-pass filter, you can get rid of the high PWM frequency and you get a DC voltage. But as I said, it doesn't work on this circuit, probably because the driver leaves the output floating when it is in OFF mode. I hope it's clearer now.

That doesn't help me much. I would appreciate if you could show me how.

The frequency will be (probably) 1 kHz, but a low-pass filter can be adjusted for to filter any PWM frequency. I don't know how much is the impedance for the DC voltage, but I would imagine that it will be very high (probably input of opamp, but I would need to check).

@jonk This is the idea of these comments. To clarify the question, so an answer can be provided :-)

@Marcos, this extra information should be added to your question. The general idea of Stack Exchange is based on the notion of a concise question/concise answer. This isn't Facebook.

A warm welcome to the site. I think you're using comments on this site like 'Reply' is used on discussion sites. New information should be edited into your Question. Otherwise, readers have to piece all of this together to understand it. Please rewrite the question text as needed to contain this info, don't just dump it at the end under an 'EDIT' heading. Explain everything people will need to evaluate your question, don't expect a chat-discussion exchange with them. The better the quality of your question, the better the quality of the answers it will attract. Thanks.

@TonyM Thanks. I appreciate your comment. I'm happy to add new information to the question.

@Kartman, pull up resistor? Facebook?

@Marcos - you can Google those two terms. The first term is of more use to you.

@Kartman, that's okay if you don't want to help. Sadly, your comments don't do much to make people feel welcomed to the community...

This site is not a free design house, homework-answering service or on-line technical encyclopaedia, copied out to you on demand. People will help you take the next step if your question shows you've already done as much as you possibly could - which yours doesn't. Please show actual effort to the community you speak of by improving the quality of your question as you've been asked multiple times by a succession of users here. Their time and help are purely voluntary and their patience is not infinite, especially when faced with somewhat mocking comments. Voting to close.

@TonyM, no intention to insult the community at all. The question has all the relevant information. None of the comments adds anything new to it. As I said before, if anyone has a relevant question that I can answer, I'd be more than happy to do so.

@marcos. You only put what information YOU think is relevant. I gave you the answer early on - maybe I wasn’t explicit enough. add a 10k resistor from the output to 24V (ie pullup resistor) then add your low pass filter. Simulate. Vary component values to suit.

@Kartman, thanks a lot for your help. I just tried it and it worked perfectly! I didn't know what you meant when you said "pull up resistor" the first time. If you rewrite your comment as an answer, I'll upvote it.

As @Kartman says, you'd only put into your question what you thought was relevant and/or could be bothered to. You didn't edit your question once, just bluntly ignored encouragement to do so and rambled through more comments. The site is a Q&A site, not a discussion site. I think people would swap all the thanks at the end for co-operation during, as shown by their comments and downvotes. Take the tour and reflect on that. Discipline and communication are essential quality of a good engineer, the route to successful work, work-first-time designs and also better jobs and pay.

@TonyM, I understand what you say, but if you think about it, Kartman answered my question with the information provided initially. Therefore, there was no need to edit the question (I would have done so if it was really required). I am happy that my question was answered, even if you voted to close, jonk was far from being helpful and I had to face Kartman's "somewhat mocking comments". But, I'm still grateful that sites like this exist.

I have thought about and the evidence shows you're wrong. Your replies may look like rapier-like retorts to yourself but they're old and tired. And the people you're belittling can do what you couldn't: design circuits that work. Anyway, this is a pointless discussion. I'll leave you to your obscure point-scoring game that's got just you in it.

@Marcos Since you have your answer, you may as well add it here and then select your own answer for your question. That has the advantage of closing out the question and making your answer available to others. This is allowed and sometimes even encouraged. And I was exactly equally as helpful as you were in kind.

@jonk, welcome back to the conversation. You're right, I wasn't being helpful, I just replied to all the questions in a nice way, including yours (showing that you didn't even read/understand my question properly to start with). That's a pity that no-one can see it anymore because you deleted all your comments. That said, I will add "my" answer as soon as I can so other people can see it. Then, I'll go back to my inferior life where, apparently, I'm unable to design circuits that work. Huv' a gud yin!

@Marcos Your life is only as you choose to make it. None of us have anything to say about that. If you choose to define yourself through word games then that's your own business. I'd believe otherwise would be better for you. But again that's not my business. It's yours. (I removed my content because you had edited in much more content in your comments after I saw much less. So it no longer accurately reflected the progression of your word games. You are perhaps the first person who earned that from me. I guess you can pat yourself on the back for that much.)

@jonk, no need to worry about me, thanks. Also, no need to justify why you deleted your messages, I encourage you to do that until there's none left.