Need help on proper circuit connection
The FOD3184 needs a power supply of at least 13.5V (15V~30V recommended) and the IRG4BC20UD needs 15V Gate drive to turn on fully, but the NMK0505SAC dc-dc converter only puts out 5V. You should be using a 5 to 15 Volt DC-DC converter (eg. NMK0515SAC).