TASKLED - Smart LED drivers

Latest News (Jan 2010): MaxFlex5A shipping in 2010 has 29V max output voltage and introduces 1300mA current table.

MaxFlex5:

• Additional dedicated ground solder pad from momentary action switch (maxflex5 improvement).
• Enhanced reverse polarity protection.
• Microcontroller based Constant current boost regulator.
• User configuration options stored in non-volatile EEPROM.
• Ships configured for 350mA current limit.
• User reconfigurable current limit: 350/500/700/1000 or 1200mA (or 1300mA MaxFlex5A, total of 6 current tables) at any time.
• UI-uni 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). Now with on-board 100 ohm series resistor.
• Onboard pullup resistor on switch input to provide reliable performance of external momentary action switch when used with longer wires.
• 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.
• Non-volatile storage of brightness level.
• Draws < 50uA when in 'sleep mode' (25uA typical).
• User selectable voltage trip point to warn of low input voltage, useful to protect rechargeable batteries from overdischarge (Refer to technical section).
• >85% efficiency.
• Can drive up to 24V (29V for MaxFlex5A) of series connected LEDs. Open circuit protected.
• Operates from 2.5V to 20V (input voltage, do NOT use more than 4 li-ion cells). Being a boost converter, input voltage must be less than output voltage.
• Board is circular (0.90" diameter, 0.25" thick).

Note 1: MaxFlex5A uses the same PCB as maxFlex5 so the silkscreen will still say V5.0. The maxflex5A version increases the voltage to 29V by 3 component changes on the PCB rather than a change to the actual PCB design.

Note 2: The 1300mA table is nominally 1330mA - obviously there are component tolerances that can affect the actual maximum output current of a particular driver board up to +/-5%.

MaxFlex4:

• Reverse Polarity Protected (New V4 feature).
• Improved thermal path (New V4 feature. Thicker copper and more thermal vias with thicker plating).
• New uController regulator (New V4 feature).
• Microcontroller based Constant current boost regulator.
• User configuration options stored in non-volatile EEPROM.
• Ships configured for 350mA current limit.
• User reconfigurable current limit: 350/500/700/1000 or 1200mA at any time.
• UI-uni 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). Now with on-board 100 ohm series resistor.
• Onboard pullup resistor on switch input to provide reliable performance of external momentary action switch when used with longer wires.
• 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.
• Non-volatile storage of brightness level.
• Draws < 50uA when in 'sleep mode' (25uA typical).
• User selectable voltage trip point to warn of low input voltage, useful to protect rechargeable batteries from overdischarge (Refer to technical section).
• >85% efficiency.
• Can drive up to 24V of series connected LEDs.
• Operates from 2.5V to 20V (input voltage). Being a boost converter, input voltage must be less than output voltage.
• Open circuit protected (boosts to 24V maximum).
• Board is circular (0.90" diameter, 0.25" thick)

MaxFlex3:

• Microcontroller based Constant current boost regulator.
• User configuration options stored in non-volatile EEPROM.
• Ships configured for 350mA current limit.
• User reconfigurable current limit: 350/500/700/1000 or 1200mA at any time.
• UI-uni 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). Now with on-board 100 ohm series resistor.
• Onboard pullup resistor on switch input to provide reliable performance of external momentary action switch when used with longer wires.
• 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.
• Non-volatile storage of brightness level.
• Draws < 50uA when in 'sleep mode' (25uA typical).
• User selectable voltage trip point to warn of low input voltage, useful to protect rechargeable batteries from overdischarge (Refer to technical section).
• >85% efficiency.
• Can drive up to 24V of series connected LEDs.
• Operates from 2.5V to 20V (input voltage). Being a boost converter, input voltage must be less than output voltage.
• Open circuit protected (boosts to 24V maximum).
• Board is circular (0.90" diameter, 0.25" thick)

29 Dec 2008: New UI-uni 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.

MaxFlex2:

• Microcontroller based Constant current boost regulator.
• User configuration options stored in non-volatile EEPROM.
• Ships configured for 350mA current limit.
• User reconfigurable current limit: 350/500/700/1000 or 1200mA at any time.
• UI-uni 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.
• Non-volatile storage of brightness level.
• Draws < 50uA when in 'sleep mode' (25uA typical).
• User selectable voltage trip point to warn of low input voltage, useful to protect rechargeable batteries from overdischarge (Refer to technical section).
• >85% efficiency.
• Can drive up to 24V of series connected LEDs.
• Operates from 2.5V to 20V (input voltage). Being a boost converter, input voltage must be less than output voltage.
• Open circuit protected (boosts to 24V maximum).
• Board is circular (0.90" diameter, 0.25" thick)

Older maxFlex information.

MaxFlex:

• Microcontroller based Constant current boost regulator.
• User configuration options stored in non-volatile EEPROM.
• Ships configured for 350mA current limit.
• User reconfigurable current limit: 350/500/700/1000 or 1200mA at any time.
• User configurable choice of 3 UI's. The user can select either the Fixed lighting (UIF version, 8 'brightness' level) firmware, the Flashlight (UIP, 5 'brightness level) firmware or the new Bicycle (UIB) firmware. Refer to the maxFlex technical section for downloadable PDF manual.
• Non-volatile storage of brightness level.
• Draws < 50uA when in 'sleep mode' (25uA typical).
• User selectable voltage trip point to warn of low input voltage, useful to protect rechargeable batteries from overdischarge (Refer to technical section).
• >85% efficiency.
• Can drive up to 24V of series connected LEDs.
• Operates from 2.5V to 20V (input voltage). Being a boost converter, input voltage must be less than output voltage.
• Open circuit protected (boosts to 24V maximum).
• Board is circular (0.80" diameter)

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