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You need to provide 10V or the PWM Circuit wont work.
use this diagram, but use a 670Ω resistor instead:
http://i229.photobucket.com/albums/e...cts/pullup.jpg
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My dimming turns off at 25% with a 680 Ohm resistor. (Running the ledstring @ 1A)
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680 Ohm is a rather low resistor. Keep in mind the maximum current for LED-Control passive is 12mA (as mentioned in the manual). With 680 Ohm at 10V the current is over 12mA.
At 10V the resistor should not be lower than 750 Ohm (calculated as: (10V - 1V@12mA) / 12mA).
If you need to meet the specifications for TTL the current should not exceed 10mA.
