Hi,
I am trying to figure out what is the best way to dim a MR16 LED bulb (attached is datasheet). This bulb has to pins that accept 7V to 15V AC/DC. The mfgr claims, it is dimmable by changing the voltage and the LED bulb has PWM dimming circuit built inside. I have 12 VDC @ 1Amp input supply available to give to this LED bulb. Can I dim it with just a potentiometer? I have tried to use a 5K potentiometer and within 20 degrees of rotation of pot, I get whole dimming, this pot is only 1/4 Watts.
1. What would be the best way to dim this unit?
2. The LED bulb is rated for 4 Watts, if I use the 1/4 Watts pot, will the pot eventually heat up and fail?
3. I have another dimming circuit (PWM) with pot, when I tried this with the LED bulb, it did seem to work, but I saw flickering effect when turning the pot knob, would this because there may be conflict between PWM on my dimmer unit and PWM inside the LED bulb? (Ths bulb did not flicker once pot know was steady)
4. My goal is to find out if there is an off-the-shelf component (voltage shifter/potentiometer etc.) that I could use to dim this LED without going into designing a special circuit for it.
Any help, comments are highly appreciated !
Mayur
I am trying to figure out what is the best way to dim a MR16 LED bulb (attached is datasheet). This bulb has to pins that accept 7V to 15V AC/DC. The mfgr claims, it is dimmable by changing the voltage and the LED bulb has PWM dimming circuit built inside. I have 12 VDC @ 1Amp input supply available to give to this LED bulb. Can I dim it with just a potentiometer? I have tried to use a 5K potentiometer and within 20 degrees of rotation of pot, I get whole dimming, this pot is only 1/4 Watts.
1. What would be the best way to dim this unit?
2. The LED bulb is rated for 4 Watts, if I use the 1/4 Watts pot, will the pot eventually heat up and fail?
3. I have another dimming circuit (PWM) with pot, when I tried this with the LED bulb, it did seem to work, but I saw flickering effect when turning the pot knob, would this because there may be conflict between PWM on my dimmer unit and PWM inside the LED bulb? (Ths bulb did not flicker once pot know was steady)
4. My goal is to find out if there is an off-the-shelf component (voltage shifter/potentiometer etc.) that I could use to dim this LED without going into designing a special circuit for it.
Any help, comments are highly appreciated !
Mayur
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