Load any typoscript in an extension

When you write an extension you get passed it's typoscript config (plugin.tx_myext_pi1). However I'm writing a service class that doesn't have access to this passed data so how do you get this information? The TS Parser:

//Change this key to whatever typoscript object you need
$myTSKey = 'plugin.tx_myext_pi1';
//Create new TSParser object
$TSparser = t3lib_div::makeInstance('t3lib_TSparser');
//Load conf with myTSkey's config data
list(,$conf) = $TSparser->getVal($myTSKey, $GLOBALS['TSFE']->tmpl->setup);