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TASKLED - Smart LED drivers

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Latest News (24 Dec 2007): UI-uni released and shipping. See below for powerful new bike specific features.

nFlex (new V4 Hardware released 1 June 2007):

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).
Non-volatile storage of brightness level.
Draws <0.2mA when in 'sleep mode'.
>85% efficiency.
Can drive up to 25V of series connected Luxeons (from minimum input = (output voltage + 1.5V)).
Operates from 4V to 30V. Being a buck converter, input voltage must be greater than output voltage - see the nFlex technical section (manual) for specific information.
Protected against reverse polarity connection and output short circuit.
Board is 1.1" x 0.8"

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

29 Dec 2008: New version 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 nFlex technical section for downloadable PDF manual.

Here's a picture (latest V4 PCB layout) of the front & back of an assembled nFlex - 1.1" x 0.8".

Here's a picture of the previous V3 PCB layout:

V1/V2 & V3 of nFlex hardware had the following operating characteristics versus the new V4 hardware:

Low voltage sense circuitry that monitors the input voltage connected to output of protection diode.
Support for up to 16V of LED load.
Maximum input voltage 24V.