We are using AL3353 boost output LED driver for our product design.Experiencing a problem at some times the output locks the FET and not driving the load.We tried of Varying Cs,Comp,Ovp,Fb but couldnt sort out.Can any one please give some ideas of what may causing it?

 

Post the schematic.

 

Post the schematic.

 

Can you upload as a file the zoomable pdf, its impossible to see anything in that image

 

Maybe better to post just the LED driver portion of the circuit at a more readable size.

 

Maybe better to post just the LED driver portion of the circuit at a more readable size.

 

Hmmm, a little more complex than a backlight driver! Seems your using the boost controller with an auxiliary L-D-C to give around 90v at 30W to drive what? What's the PWM frequency on that?

OVP is set for 96v.

Current limit at 330mA

Can't see anything immediately obvious. What's the purpose of the 3v9 and 110v zener diodes?