I've just run the designer and selected an LM5118. According to Webench, I= =20 need a 1,000,000 KOhm resistor as a pull up for the enable line.=20 I've always wanted to buy one of those giga ohm resistors off of E-14, now= =20 I've got a reason to. Colin -- cdb, on 8/07/2014 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .