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Thanks @Mediacom87

J'ai trouvé ceci sur internet, après plusieurs tests et plusieurs  modifications du code , ça fonctionne dans mon module custom_module :

Merci à tous

   
                $delimiter = ",";
                
                $filename = "custom_" . date('Y-m-d') . ".csv";
                
                ob_end_clean();
                 
                $f = fopen('php://memory', 'w');
                
                $fields = array('ID', 'NOM', 'PRENOM');

                fputcsv($f, $fields, $delimiter);
                
                for($i=0;$i<10;$i++){
       
                    $lineData = array('aaaa', 'bbbb', 'cccc');
                    
                    fputcsv($f, $lineData, $delimiter);

                }
                
                // Move back to beginning of file
                fseek($f, 0);
                 
                // Set headers to download file rather than displayed
                //header('Content-Type: text/csv');
                header('Content-Type: text/csv; charset=utf-8');
                header('Content-Disposition: attachment; filename="' . $filename . '";');
                 
                //output all remaining data on a file pointer
                fpassthru($f);
                
                exit();