cURL supports ftp-sand has perl bindings. Something like:

use strict;
use WWW::Curl::easy;

my $url = "ftps://username\@ftps.server/path/";

# Init the curl session
my $curl= WWW::Curl::easy->new() or die "curl init failed!\n";
[download]

Plus the ftp test that comes with the module should put you on the right track.

Oh, and PASV is the default mode for ftps ...