It's correct, positive voltage in flyback phase.Your bias coil also looks wrongly phased...link in the LNKXXX datasheet and ill chek for you.
I guess theres a question regarding the Load thats attached. What is it? If it has any inductive propertites (pump, motor etc.) then a back EMF could exceed the 100V rating of the diode. Theres no significant filtering except the output diode so could possibly exceed the reverse rating of the diode.Hi,
I have a product that is been used in the field for years. I received a complaints from a customer who is using our products in the boats and the customer said the product does not work. When I examined the product I found that on the power supply (3W flyback converter) the secondary output diode (D50 on schematic) have been failed (not short circuit and there is no indication that shows the diode is burnt or anything. it looks fine on the surface). They returned 10 pcs of products and all of them had this problem on the power supply. When I changed this diode the product is working completely fine.
You can see the schematic of the flyback circuit below. As I stated, this product is been using in the field for years but I didn't receive any product with a problem regarding this diode. This is the first time and all of these 10pcs products is used on the boat. So I think maybe there would be something in the boats causing this issue.
Looking for any idea regarding what might cause it.
Thanks in advance.
View attachment 177769
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