Review/Test of 9A 3-Mode 5.5-12V Circuit board

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Driver is from Intl-outdoor.com

Official specifications:




Measurements

Tested with: SST-90
Max. height: 17mm
Diameter: 24 & 26mm.
The driver has high, medium, low.
High: No pwm, only some switching noise at 450kHz.
Medium: 1kHz pwm with 28%
Low: 1kHz pwm with 3.3%
The driver has memory, the actual mode is stored when the light is off for a short time.
When turning off for changing mode, the driver is slight slow to turn on
Driver is buck only
The driver can be used with 2 or 3 LiIon batteries in series.



High

9A%203-Mode%205.5-12V%20HL

The driver keeps a nice constant output to the led, down to 5.5 volt, where the low battery warning turns on.
The efficiency is not that good, this means the driver needs a lot of cooling.

9A%203-Mode%205.5-12V%20HLDriver

Up to 12 watt in the driver, it is a good detail that it has temperature warning.

9A%203-Mode%205.5-12V%20HLLed

About 31 watt into the led.

High%20noise

The driver is not fully filtered, some of the switching waveform reach the led, but it is at 450kHz, i.e. invisible.

High%20noise%207.2V

At lower voltage the switching output looks slightly different.

Low%20battery%20warning

The low battery warning is two flashes.



Medium

9A%203-Mode%205.5-12V%20HL%20medium

Medium uses a lower current and has the same low voltage limit. The actual regulation is done with pwm.
Due to the pwm I cannot do precise voltage measurement on the led, but assumes the voltage is 3.65 volt (See led curve above).

9A%203-Mode%205.5-12V%20HL%20mediumDriver

9A%203-Mode%205.5-12V%20HL%20mediumLed


Medium%20pwm

The pwm is at about 1kHz.



Low

9A%203-Mode%205.5-12V%20HL%20low

At low the driver has a low efficiency at high voltage (There is not much change in input current with voltage).

9A%203-Mode%205.5-12V%20HL%20lowDriver

9A%203-Mode%205.5-12V%20HL%20lowLed

Low%20pwm

The pwm is at about 1kHz.



Conclusion

The driver does the job, but with only low battery warning for two batteries and the low efficiency I am not that impressed.



Notes

How do I test a led driver
List of all tested drivers