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  • Overall Rating: 5
  • Price: 5
  • Quality: 5
  • Ease Of Use: 5
  • Usefulness: 5
Good regulator PCB for 1-2A loads – 18V 5W Cree Circuit Board for Flashlights (16.8mm*5.5mm) Reviews

posted by isotco on 01/18/2010 Certified Owner

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

Pros:
These are good boards based on AX2002 step down converter chip. It is easy to modify their output current, just change the value on the largest resistor on the board or replace the same sense resistor with a pot. Uses adequate components like a SS34 for rectifying diode. Soldering is notably better than what I've seen on many other cheap regulators.
Cons:
From what I've seen all AX2002 based converters lose efficacy if output current is set to less than 1000mA
Other:
Diameter is 16.5-17 mm Height is 3.8 mm Preset current is 1.25A (0.2 Ohm sense resistor) PWM dimmable through pin 2 (EN) Really easy thing to do actually, just desolder a single SMD resistor and solder a wire for PWM input To calculate sense resistor value for a specific current you use the formula 0.25/I = R Example: If I want 1.5 A output current I calculate the sense resistor value like this, 0.25/1.5= ~0.17 ohm sense resistor. Datasheet: http://www.axelite.com.tw//Products/AX2002-V1.4-20090212.pdf
Bottomline:
Excellent regulator, very easy to use and offers efficient, robust operation.

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