# Problem with 230v LED Driver circuit

1. ## Problem with 230v LED Driver circuit

I have been trying to make an AC LED lamp consisting of 44 LEDs. The LEDs are rectangular and give out a bright white light. I am not sure of the current of the LEDs and so have been trying different driver circuits to drive the LEDs. I tried the following circuit but the LEDs were dim. Can someone tell me what's wrong with the circuit?

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2. ## Re: Problem with 230v LED Driver circuit

It seems your current is too low. Replace the 220nF capacitor and place a 1uF one. You may require to add another capacitor in parallel if the light intensity is not desirable.

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3. ## Re: Problem with 230v LED Driver circuit

What is the rated voltage of the LED's?

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4. ## Re: Problem with 230v LED Driver circuit

The bright whites that I'm familiar with are rated 3.6V at 20 mA.

It's a good idea to include a resistor to limit inrush current on power-up. 330 ohms should be sufficient. 1W rating.

I've made a simulation showing how you could drive these from 230V mains AC.

The smoothing capacitor will acquire upwards of 180 V and must be rated higher than that. Its value is not critical.

A 470 nF dropping cap appears sufficient to obtain 18 mA through the led's.
If you are certain they can tolerate 25 mA, then try a 680 nF.
Or a 1 uF if they are they kind that can tolerate 36 mA. Then the inrush resistor is carrying 3W peak.

5. ## Re: Problem with 230v LED Driver circuit

Thx its helpfull working...

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6. ## Re: Problem with 230v LED Driver circuit

Thanksssssssssssssssssss

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