DX  » Community » Reviews » 5V~8.4V 15W 5*Cree 5-Mode Memory Circuit Board for Flashlights (26mm*13mm)
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  • Overall Rating: 5
  • Price: 5
  • Quality: 5
  • Ease Of Use: 5
  • Usefulness: 5
useful driver – 5V~8.4V 15W 5*Cree 5-Mode Memory Circuit Board for Flashlights (26mm*13mm) Reviews

posted by googy on 09/15/2009 Certified Owner

Involvement:Expert (understands the inner workings) - Ownership:more than 1 month

Pros:
The only driver on DX capable driving 4-5 LEDs in series from 5 - 8.4V.
800mA are better then 1000mA, because of 15W power, 80% efficiency and no thermal management
Cons:
no thermal management (except the coil)
driver is getting warm-hot
Other:
on high, 4xQ5, 2p2s 18650 LiIon
Iout 0,8A
Vout 13,84
Pout 11,07
Iin 1,78
Vin 7,55
Pin 13,44
results in an efficiency of 82%
2.3W are heating up the driver, the big coil is acting like a cooler
the lower modes are realized by PWM so the efficiensy will be worse but not much, I hope (I dont have tools to messure efficiency with PWM)
The driver is switching modes in a different way like most other driver do. The modes are switched if you turn the driver off and then on. Not like most others, turn on and imidiatly off to switch modes.
Bottomline:
useful and cheap driver
2xLiIon / 5xNiMh / 6xNiMh

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