As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON SHORT FINAL STRONG ELECTRICAL BURNING SMELL WAS DETECTED IN COCKPIT AND CABIN AREA. COMPLETED LANDING AND SHUTDOWN AIRCRAFT. IT WAS NOTICED THE FIVE VOLT USB CHARGING SYSTEM WAS INOPERATIVE. MAINTENANCE TROUBLESHOT THE SYSTEM TO THE 24V -5V DC CONVERTER.