1* AA/AAA 1-Mode 550mA Linear Booster LED Flashlight Driver Circuit (Nanjg 102)




Driver is from fasttech.com.

Official specifications

• Constant Current: No
• Driver Type: Boost driver
• Input Voltage: 0.9~1.5 -volt
• Output Current: 550 mA
• PCB Height (w/o Components): 1.5 mm
• Mode Count: 1
• Diameter: 13 mm
• Product Weight: 0.6 g

Measurements

Tested with: Cree XP-G2 led
The driver is a boost driver
Height: 4.5mm
Diameter: 12mm


This driver is always pulsing the led, spoiling any power and efficiency calculations.

High



The driver does not have stabilized brightness, but increases brightness with voltage. It uses a lot of current if the battery can deliver.







Increasing the voltage from zero, shows that the driver turns on at 0.8 volt.



Here the pulsing can be seen, it is very fast (way above being visible) and I expect the frequency to vary with battery voltage.



Conclusion

This driver does what it is supposed to do, but be very careful with lithium batteries, they may overload the driver.



Notes

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