LNK413 led driver

Posted by: ajith_vithanage on 08/04/2011

hi
i have made a sample led driver using lnk413
output voltage and current are 10.8V , .7A

i have a issue that once circuit is powered it takes 3 - 5 seconds to lit the LED s .

please help

Comments

Make sure you are using the right capacitor at the BP pin and the right values for your line peak detector connected to the V pin. If you like to post your schematic for us to take a look. Thank you.

thanks for the reply .please find the attached schematic diagram.

change c8 to 10 uf

i have changed c8 to 10uf .
but starting delay is there.

it takes 3-5 seconds to lit LED s after power on the circuit.

Place 240K, 0.5W resistor parallel to Diode D2....
replace C8 with 10uF,16V.....
replace R9 with 150ohms.....
R11 resistor not required remove it.....