Cuk Converter Battery Charger with a failing IGBT

Hi, I designed a Cuk converter to charge a hybrid battery that I have simulated with PSpice and am currently trying to build. My circuit is being controlled by a PIC and it seems the PWM is working correctly. My IGBT was destroyed when I released the PIC from reset, it ramped up the duty cycle (which takes about 20 seconds), and I heard a "pop" from the IGBT about a second later (It has blown before, but never without an obvious cause). My IGBT is a SGP30N60 http://www.farnell.com/datasheets/85603.pdf

My IGBT driver is a MC33153. It is controlling the IGBT through two 10 ohm resistors in parallel. One resistor has a diode in series with it so the resistor will sink current but not source it (see schematic). Pins 2, 3, and 1 are grounded. Pin 6 (Vcc) is connected to +15VDC. Pin 7 is connected to Vcc through a 22kohm resistor.
http://www.onsemi.com/pub_link/Collateral/MC33153-D.PDF

I am perplexed as to why the IGBT keeps blowing.