Review/Test of 1A 2.7-5.5V Buck-Boost Circuit board
Driver is from Intl-outdoor.com
- Input voltage: 2.7-5.5V
- Buck-Boost driver
- Constant current output, 1A (To the LED)
- This driver does not use PWM
- High mode efficiency from 84% to 90% depending on the input voltage.
- Medium mode efficiency 94-95%
- Memory function
- Low voltage protection
- Reverse polarity protection
- First PCB Diameter: 15mm
- Second PCB Diameter: 16.6mm
- Total height: 6.5mm
- Gold plated contacts
- Tinned copper leads
Low voltage protection system:
*If the battery voltage is lower than 3V:
when the light is on (constant light), the output will be changed to 10mA.
when the light is flashing , the output will be changed to 50mA and keep flashing.
*If the battery voltage is lower than 2.7V, the output will be cut off but still there will be an input of about 0.3mA
(There will be no current consumption switching the flashlight off )
Tested with: Cree XP-G2
Max. height: 6.5mm
Diameter: 16.5 mm and 15mm.
Strobe: 10Hz at 3.7 volt.
The driver has high, medium, low, strobe and sos.
The driver has memory, the actual mode is stored when the light is off for a short time.
A very short off/on will select next mode.
The driver is mainly buck, but can boost a little bit.
The drop in led current between 3.25 volt and 3.50 volt is probably the change from buck to boost.
Very good regulation, without any noise.
Due to inherited looses in the circuit, the boost need to be activate while the input voltage is above the Vf of the led.
At low the boost is not needed and due to the low current there is some noise in the measurements.
The spacing in the morse code is not correct.
This driver will provide full output from 3.0 volt to 5.5 volt with good efficiency.
I like this driver.
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