OLYMPUS DIGITAL CAMERA
OLYMPUS DIGITAL CAMERA

b2Flex 1.5A LED Driver from TaskLED

$15.00

1 in stock

Category:

Product Description

1 Description
The heart of b2Flex is a Microcontroller (uC) that contains the user interface firmware. Features of
this circuit/UI combination include:
• Choice of 3 different User Interfaces, UIF fixed lighting optimized, UIP portable lighting
optimized and UIB2 bicycle lighting optimized.
• High efficiency Buck mode (step down) switching regulator (maximum drive current set in
firmware).
• Single switch to select from various brightness levels, turn the unit on/off, select the
operating modes and set menu options.
• Non-volatile (EEPROM) storage of operating mode, last selected brightness level, and
maximum drive level (350mA, 500mA, 750mA, 1000mA, 1200mA or 1500mA).
• Voltage sensing with three user configurable trip points for ½ discharged and nearly fully
discharged and forced off (or warn only). Warning display via an optional 3mm or 5mm
status LED or via the main LED.
• Temperature sensing with user configurable trip point to limit output current to protect the
driver and/or LED.

  • b2Flex.pdf (V1.0, manual for b2Flex V1.0 – UI-UNI2 firmware)

Efficiency Measurements:

As with any buck driver, efficiency is highest when input voltage is closer to output voltage and also with higher voltages. So, a 1 LED (3.3V Vf) system will be less efficient than say a 3 LED (10V Vf) system.

Typical measured efficiency values are shown in the table below

# LEDs Input Voltage Output Current Efficiency
1
4V
350mA
87%
1
10V
350mA
80%
1
14.8
350mA
76%
2
8V
500mA
91%
2
14.8V
500mA
88%
2
8V
750mA
91%
2
14.8V
750mA
89%
2
8V
1000mA
90%
2
14.8V
1000mA
89%
2
8V
1200mA
90%
2
14.8V
1200mA
88%
2
8V
1500mA
88%
2
14.8V
1500mA
87%
3
11V
350mA
92%
3
14.8V
350mA
88%
3
11V
500mA
93%
3
14.8V
500mA
91%
3
11V
750mA
92%
3
14.8V
750mA
91%
3
11V
1000mA
92%
3
14.8V
1000mA
91%
3
11V
1200mA
91%
3
14.8V
1200mA
90%
3
11V
1500mA
90%
3
14.8V
1500mA
89%

As can be seen from the table, in a 3 LED, 4 Li-Ion system, the b2Flex will be typically running around 90% efficient.

So, assuming 3 LEDs with a total Vf of 10.5V at 1500mA we can calculate driver power dissipation as:

10.5V x 1.5A x 0.1 = 1.6W

It is HIGHLY recommended that the b2Flex be attached to a heatsink/thermal path using the gold rectangular area in the following picture.

Potting Warning:

Areas of the circuitry on b2Flex utilize high impedance paths and if potting (not required) is to be utilized, the user must ensure than the compound is non-conductive and non-capacitive otherwise correct operation may be compromised. A product like Artic Alumina epoxy will work well.

The following picture shows the top of b2Flex.

The X/Y position of the various solder pads/connection points is in the table below. X/Y position 0,0 is the center of the board. X/Y positions are in mils (0.001″, so -230 means -0.230″)

 

PAD
X
Y
LED- -230 360
IN- -40 415
STAT- 95 415
SWB 220 360
SWA 340 245
STAT 405 -100
LED+ 355 -225
IN+ 270 -330

 

Input voltage connects to IN+ and IN-.

The LED(s) connect to LED+ and LED- (NOTE: LED- is NOT the same as IN-).

The control switch connects to SWA and SWB (SWB is electrically the same as IN-). The switch only switches a control signal and carries at most 350microamps.

The status LED (optional) connects to STAT and STAT- (STAT- is electrically the same as IN-).

The following picture shows the bottom of b2Flex.

Cost here includes all taxes, local pickup only on tour days or please schedule a pickup time via the contact us link at the top right.

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