DX  » Community » Reviews » MR16 1*3W 650~700mA Constant Current Regulated LED Driver (8~24V Input)
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  • Overall Rating: 5
  • Price: 5
  • Quality: 5
  • Ease Of Use: 5
  • Usefulness: 5
Very flexible PT4115 based driver. Easy to mod. – MR16 1*3W 650~700mA Constant Current Regulated LED Driver (8~40V Input) Reviews

posted by desolder on 05/21/2010 Certified Owner

Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month

Pros:
Efficiency is fantastic! I measured 94% efficiency with 12VDC and 3 LED's, bypassing the bridge rectifier. As a consequence, it also stays very cool.
So easy to mod. I added a 1 ohm resistor to increase current to 770mA and also bypassed the bridge rectifier to improve efficiency a little. You can even piggy back a PWM circuit if you want, for external control and custom modes.
It's small, and you can even cut it smaller if you don't need the bridge rectifier.
Cons:
There is no output capacitor. This may cause interference with nearby electronics. Add a 1uF capacitor across the output to reduce RF interference.
It's only ~80% efficient with one LED.
Input capacitor is only rated for 25V. DX claims 8 to 40V input. You will need to upgrade the capacitor for >25V.
Other:
If you are using this with 12VAC and 2 or 3 LED's, you need a bigger input capacitor in order to maintain full power. I recommend 330uF for 2 LED's, and 1000uF for 3 LEDs.
Bottomline:
I'm using this with sku.15084 for a 3 LED bike light and it works great!

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