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TASKLED - Smart LED drivers

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Discontinued Product, use b2Flex instead

Latest News (17 July 2009): New V3 bFlex (White soldermask, BLACK silkscreen) shipping with 25V input rating.

bFlex_V3 and bFlex_V2B (Hardware specifications/features):

Microcontroller based constant current regulator.
Ships configured for 1W, 350mA current limit.
User menu reconfigurable to 350/500/750 or 1000mA at any time.
Current limit set in firmware.
User programmable low voltage warning.
Ships with UI-uni firmware (see below).
UI-uni supports Master/Slave mode for bFlex. This allows a single bFlex master to control up to two slave bFlex drivers.
Non-volatile storage of brightness level.
Draws <0.2mA when in 'sleep mode'.
>85% efficiency.
Can drive up to 24V (V3 shipping July 17 2009 and V2B shipping 6 Jun 2008) of series connected LEDs (from minimum input = (output voltage + 1V)).
Input operates from 4V to 25V. Being a buck converter, input voltage must be greater than output voltage - see the bFlex technical section (manual) for specific information.
Protected against reverse polarity connection (low loss FET), output open circuit and output short circuit.
Board is 1.0" in diameter, 0.33" thick (without switch) or 0.54" thick (with switch).

(UI-uni new Firmware release - 24 Dec 2007):

29 Dec 2008: New minor version update released (see technical section), adds the option to Warn Only instead of Cut Off when the Cut Off battery voltage occurs. Also fixes a bug where in extreme low temperature conditions the firmware thinks the driver is overheating and limits drive current.

The new UI-uni firmware unifies the previous UIF, UIP and UIB2 firmware into a single release. This has the advantage of providing the user with a choice of 3 of the most popular TaskLED UI's in a single product. The user can configure via the menu system which of the UI's is active at any time. UIF and UIP also inherit the temperature sensing capability of UIB2 along with the new 3 level voltage monitoring capability.

Unification of UIF/UIP firmware with the UIB2 firmware.
3 user configurable voltage trip points to set independent Medium, Low warning levels and Cutoff.
If an optional 3mm or 5mm status LED is connected, the user can configure the status LED to warn when the voltage reaches Medium (status LED lights constant) or Low (status LED flashes).
Temperature monitoring of driver board. If closely coupled with the light's body, it can be user configured to force the current output to reduce. Optional trip points of 50, 60, 70, 80, 90C or off.
UIB2: Bike optimized, Choice of 2 level (duomode) or 5 level (multimode) operating modes.
UIF: 8 level dimming, fixed lighting use optimized..
UIP: 5 level dimming, flashlight use optimized. .
User selectable optional Force level (the level that the light will always turn back on).
Optional superlock that requires multiple clicks to turn the light on - prevents friends turning your light on accidentally.
UIB2: User selectable Strobe mode or Constant mode for day/dusk or night use.
Refer to the bFlex technical section for downloadable PDF manual.

Top picture of the new bFlex-V2B (Black silkscreen) shipping as of 6 June 2008. It is identical in layout to the previous bFlexV2 except for the new 25V input rating.

Here are pictures of the new bFlex-V2 hardware (20V max input rating) (shipping as of 7 Oct 2007) top and bottom (in the snazzy new white soldermask):

Here are pictures of V1.1 bFlex (started shipping 25 Apr 2007) top and bottom:

Here are pictures of V1.0 bFlex (top and bottom):