You should probably replace the led and reduce the current by changing the current programming resistor. This will increase life expectancy of the led bulb. Also the input bulk capacitor is bulging which needs to be replaced for healthy filtration of supply voltage.
First of all you are a good teacher. I liked your videos and narration. I want to know what voltage & current rating of a driver required for a 18W tube light (by Wipro). There are total 98 LEDs, connected in pairs (groups of two parralel) and all the 49 pairs in a series. The data plate says 160 ma current. But no mention of driver voltage. I tried a 100V 200ma driver, it does not give full brightness. Please reply
Don't drive LEDs as bright as possible due to efficiency. Recently ordered LM301B boards even with an 80% efficient MeanWell driver I get ~160 lm/w at half current :)
You don't give the datasheet of C1 6.8 uF (400v I hope ?) it seems very bulky, I would immediately replace it by a Japanese one. Anyway the manufacturer design circuit of this light drive too much current for the LED'S and your "repair"will probably fail in 1 or 2 month max. Sorry but at this day, the Chinese made LED fails to much. Anyway, your explanation is outstanding 👍
I'm trying to learn more about LED drivers, that's how I ended up on the channel. I have bought a batch of LEDs ceiling lights, their drivers keep on failing - and the offending part is that 6.8 uf capacitor. The whole circuit works fine again after replacing that. I've tested the circuit by putting a good capacitor of but a lower capacitance - the light then flickers occasionally. The capacitor also gets a little warm. What if we replace that with one of a higher value? Would putting a 20 uf one instead of a 6.8 uf one cause any problems? Would it likely to last longer? Putting a capacitor rated for higher voltage is very likely to make it last longer. 400v is the bare minimum here, 450v is standard, going higher than that could be beneficial. The only downsides I see with a higher rated capacitor is increased cost (which is justifiable to avoid repairing them repeatedly) and size (it has to fit in the fixture or driver casing).
Sir. I am trying to find a driver chip AREZZO 328A replacement for 5W LED bulb. Unfortunately I can't find from Aliexpres.com. Any recommendation for equivalent 8 legged chip? What's the constant current for 5W bulb? Many thanks
Do you know what LEDs are used in the bulb. In this video the LED model was printed on the board. You can then look up the specs of the LED and find a suitable driver.
If you have any questions or comments or would like to suggest something please comment here.
This is the best and accurate video so far on this topic. Tysm🙏
Glad it was helpful!
You should probably replace the led and reduce the current by changing the current programming resistor. This will increase life expectancy of the led bulb.
Also the input bulk capacitor is bulging which needs to be replaced for healthy filtration of supply voltage.
First of all you are a good teacher. I liked your videos and narration. I want to know what voltage & current rating of a driver required for a 18W tube light (by Wipro). There are total 98 LEDs, connected in pairs (groups of two parralel) and all the 49 pairs in a series. The data plate says 160 ma current. But no mention of driver voltage. I tried a 100V 200ma driver, it does not give full brightness. Please reply
Don't drive LEDs as bright as possible due to efficiency. Recently ordered LM301B boards even with an 80% efficient MeanWell driver I get ~160 lm/w at half current :)
You don't give the datasheet of C1 6.8 uF (400v I hope ?) it seems very bulky, I would immediately replace it by a Japanese one. Anyway the manufacturer design circuit of this light drive too much current for the LED'S and your "repair"will probably fail in 1 or 2 month max. Sorry but at this day, the Chinese made LED fails to much. Anyway, your explanation is outstanding 👍
Thanks for the comment. Glad you liked the explanation.
best explanation I've encountered so far about led drivers.
The bulged capacitor should have been replaced
Did you notice the bulge in one of the capacitors?
you did not notice the bulged capacitor. how come? try replacing that and the led light fixture
will light up.
Good observation. I did test the capacitor. it was fine but definitely close to its end.
I'm trying to learn more about LED drivers, that's how I ended up on the channel. I have bought a batch of LEDs ceiling lights, their drivers keep on failing - and the offending part is that 6.8 uf capacitor. The whole circuit works fine again after replacing that.
I've tested the circuit by putting a good capacitor of but a lower capacitance - the light then flickers occasionally. The capacitor also gets a little warm.
What if we replace that with one of a higher value? Would putting a 20 uf one instead of a 6.8 uf one cause any problems? Would it likely to last longer?
Putting a capacitor rated for higher voltage is very likely to make it last longer. 400v is the bare minimum here, 450v is standard, going higher than that could be beneficial.
The only downsides I see with a higher rated capacitor is increased cost (which is justifiable to avoid repairing them repeatedly) and size (it has to fit in the fixture or driver casing).
Sir. I am trying to find a driver chip AREZZO 328A replacement for 5W LED bulb. Unfortunately I can't find from Aliexpres.com. Any recommendation for equivalent 8 legged chip? What's the constant current for 5W bulb? Many thanks
Do you know what LEDs are used in the bulb. In this video the LED model was printed on the board. You can then look up the specs of the LED and find a suitable driver.
Thank you for sharing your knowledge, it is much appreciated.
Very good explanation
very good narration
Glad you liked it!