42V 600mA Led Driver Current Problem

4 posts / 0 new

Hi,

 

I designed a 42 V 600mA led driver with EDR3910 low profile core.  

The problem is Output current not exceeding 100mA.

I changed FB resistor between 50K - 150K

Also I changed transformer's secondary turns 15-30T

 

best regards,

 

Ali AYKAN 

첨부 파일Size
LinkSwitch-PH_PIDesign1_0.pdf40.93 KB
EDR3910.pdf1.5 MB

Hi,

The transformer winding is not matching to your schematic.  Please make sure that the pins are corrent and operating in flyback mode.

Please send us your PIXLS transformer calculation. 

By the way, what is the part number of LED load you are using right now?   

Regards...

Dear Jono,

 

according to this specs can you advice any winding? 

 

Transformer's Spec..

 

AEmm2 112,2

LEmm  23,4

AL 7200

AWmm2 20

 

best regards,

 

 

 

Hi,

Please refer attached as a transformer design reference:

You can use this design reference, it is closest to your specification.  You can simplify the schematic depending on the specification.

http://www.powerint.com/sites/default/files/PDFFiles/der318.pdf

Regards,

PI-Jono