Freewheeling diode breakdown using LNK304DN
Dear Sir or Madam,
In our design of Buck converter from 230 V AC to 6.3V DC using LNK304DN, we are experiencing rather frequent cases of freewheeling diode D1 breakdown. We are using diode ES1JL from Taiwan Semiconductor. The output current is up to 100 mA. Can you give any comment on whether the diode is selected properly, or there is another mistake in the design?
The load includes a relay coil switching (inductive load), but it is switched rarely and portected by separate Zener diode.