17mm CC 1000mA LED Driver 4 Mode, 2.8-4.2v

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Driver is from lck-led.com

Official specifications:



Measurements

Type: DUP-C1 or DVP-C1
Tested with Cree XP-G2 led
Diameter: 16.8mm
Heigth: 3.2mm
Modes: High, medium, low, strobe.
Driver has no memory.
A short off/on will select next mode.
Medium uses pwm at 950Hz with 23% duty cycle
Low uses pwm at 510Hz with 2% duty cycle
Strobe is at 12Hz with 28% duty cycle



High

17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20HL

This driver goes into regulation when the input voltage is about 0.25V above led Vf voltage.

17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20HLDriver
17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20HLLed


17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20LH

The driver starts at a voltage low enough that it will always drive the led.

High

In high mode there is no pwm in the light.



Medium

Efficiency calculations are mostly valid down to 3.4 volt.

17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20medium%20HL

The driver is not fully stabilized in medium.

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17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20medium%20HLLed

Medium

The constant current regulator is a bit slow to turn on, I expect this is the reason for the imperfect stabilization.
The pwm frequency is about 950Hz



Low

Efficiency calculations are not valid in low mode.

17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20low%20HL

There is no stabilization in low mode.

17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20low%20HLDriver
17mm%20CC%201000mA%20LED%20Driver%204%20Mode,%202.8-4.2v%20low%20HLLed

Low

The low mode uses short pwm pulses, this makes it difficult for the driver to turn completely on.
The pwm frequency is about 510Hz, this is not the same frequency as medium. My guess is that this is done to get a more controlled low mode, the driver would probably not be able to turn on/off fast enough to handle this mode at 1kHz.



Strobe

Strobe

The strobe is at 12Hz with 28% duty cycle



Conclusion

The driver looks like a good constant current driver with a good selection of brightness settings and a reasonable fast pwm.



Notes

I am not very impressed with lck-led's custom service. I got one wrong driver and one driver that were far outside specifications. I have sent a couple of emails to them, I got one question back after two weeks: did I want money back or a new driver. There was no explanation if it covers one or both of the problems and I do not know if they have sent me a new driver (That was my answer).


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