17mm 5-Mode LED Driver Circuit Board for Flashlight DIY

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Driver is from Fasttech.com.

Official specifications



Measurements

Tested with: XM-L2
Driver uses direct drive
Diameter 17.3mm
Height 2.8mm
Modes: High, medium, low, strobe, sos
Driver does not remember modes, but always start in high.
A fast off/on will select next mode.
Medium uses pwm at 80Hz with 40% duty cycle.
Low uses pwm at 5.4kHz with 10% duty cycle.
Strobe is 9.8Hz with 50% duty cycle
DC resistance in driver is about 0.15 ohm at 2A (Measured directly at the driver pcb).



High

17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL

The driver uses direct drive, i.e. it only add an electronic switch and a small resistance in the current path.
This means that the battery and led current will be just about the same. Due to the small resistance the battery voltage has to be slightly higher than the led Vf.

17mm%205-Mode%20LED%20Driver%20(HS602C)%20HLDriver
17mm%205-Mode%20LED%20Driver%20(HS602C)%20HLLed

17mm%205-Mode%20LED%20Driver%20(HS602C)%20LH

The driver turns on at about 2.5 volt.

17mm%205-Mode%20LED%20Driver%20(HS602C)%20LHDriver
17mm%205-Mode%20LED%20Driver%20(HS602C)%20LHLed

High%203.6V

Being direct drive, the driver does not add any noise to the current.



Medium

The power and efficiency calculations does not work here, the efficiency will be very close to the high efficiency

17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL%20medium

The average current goes down when the led is switches on/off at a fast rate. The bump in the curve is due to the slow pwm.

17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL%20mediumDriver
17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL%20mediumLed

Medium%203.6V

The medium mode uses pwm at a very low frequency (80Hz). The dip in the pulses is due to my power supply, not the driver.



Low

The power and efficiency calculations does not work here, the efficiency will be very close to the high efficiency

17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL%20low

In low mode the pwm is much faster.

17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL%20lowDriver
17mm%205-Mode%20LED%20Driver%20(HS602C)%20HL%20lowLed

Low%203.6V

The actual pwm frequency is 5.4kHz.


Strobe

Strobe%203.6V

Strobe is 9.8 Hz.



SOS

SOS%203.6V



Conclusion

This is a driver with limited applications, i.e. only LiIon batteries and led must be suitable for direct drive.
The low pwm frequency in medium will mean that many people will see flickering from the light.



Notes

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