Led driver 17mm 3A LiIon Fasttech 4594600

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The last image is from after my test.

Driver is from Fasttech.com

Official specifications




Measurements

Test is with XM-L led

High

Fasttech4594600%20High

The driver can maintain full output until 3.5V, then the output starts dropping.
Being a linear driver the input and output current is the same.

Fasttech4594600%20HighDriver

Power loss in the driver depends on difference between led voltage and input voltage, with a fresh battery it may be around 2 Watt.

Fasttech4594600%20HighLed

With 3A to the led the output power is around 10W

High4V

No PWM, only a bit of noise in the signal.
Blue line is voltage across led and yellow line is brightness measured with a photo diode.

Temp5788

M1: 109.1C, M2: 130.1C, HS1: 165.6C
But the driver needs cooling when running in high, this was less than a minute with 4.18V in, i.e. about what a fresh and over charged battery may deliver.

Temp5789

M1: 81.6C, M2: 103.9C, HS1: 117.5C
Dialing the voltage down to 3.88V reduces the heat some, this is again after a minute and a good battery can keep above 3.9V for 10 minutes!

Warning3V

The battery warning signal is fading off/on every 3. second.



Medium

Fasttech4594600%20Medium

At medium the output can be maintained down to about 3V

Fasttech4594600%20MediumDriver

The power loss in the driver is up to 1 Watt

Fasttech4594600%20MediumLed

Power is about 3 Watt

Medium4V

Again the signal is smooth without any pwm.


Low

Fasttech4594600%20Low

At low the output can also be maintained down to 3V. When the low volt battery warning is activated the current drain increases.

Fasttech4594600%20LowDriver

Not much power loss in the driver at this low current.

Fasttech4594600%20LowLed

The led gets about 0.25 Watt

Low4V

Without any PWM.



Strobe

A couple of fast off/on will activate strobe, it is 12Hz with 50% duty cycle

Fasttech4594600%20Strobe

The led current is 3A in 50% of the time when in strobe mode.
The efficiency and current in curve is wrong for this mode.

StrobeCurrentLed
StrobeCurrentPS

Just to verify the current I used my current clamp.

Strobe4V



Conclusion

This looks like a nice linear driver for 3A leds from a LiIon battery, but it need good cooling on the mosfet transistor when running in high mode.



Notes

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