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A011-D-V-700

P1-P3P4-P6P7-P9
Preliminary
©2011 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2011 - Rev 1.0
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LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
The FlexBlock
TM
High Output LED Power Module is a high-eciency dc to dc converter that delivers a xed
output current by varying the output voltage as required to maintain the specied current. Because the
forward voltage of LEDs can change based on several environmental factors as well as the age of the LED, it
is important to use this type of driver in an LED system. A fast response current-sensing circuit permits the
unit to be used in applications where ashing or pulsing of the LEDs is required. Several options are available
allowing for use with many types of LEDs and in a variety of operating modes.
Application Information
Output current, A011-D-V-350 . ..........................................350mA
Output current, A011-D-V-700 . ..........................................700mA
Dimming Input, turn on threshold ........................................1.7V ±5%
Dimming Input, full on threshold .........................................9V ±5%
External pot adjustment range ..........................................0%, 5-100%
4
Output rise time .................................................
....<2 ms
5, 6
Output fall time......................................................<100 μs
5, 6
Quiescent current (DIM = 0V) ............................................<6 mA
6
Operating temperature (Tcase)...........................................-40-+80°C
Storage temperature..................................................-40-+125°C
Fixed Current Drive
Figure 10 shows a 700mA unit driving multiple LEDs. Note that parallel strings of LEDs can be driven directly
with no additional circuitry required to insure current sharing. The nature of the LEDs themselves will provide
sucient current sharing if the parallel strings comprise three or more junctions each, and are identical in length.
4 - Refer to gure 9 for the dimming response.
5 - Tested at 24V
in
, 24V
out
6 - Actual value varies greatly based on input and/or output voltages. Actual values will be smaller in most applications.
Specications
High Output Wide Range LED Power Module
A011 FlexBlock
TM
DATA SHEET Page 4 of 9
When wired in the default conguration, as marked on the top of the unit, the A011 FlexBlock is in
Buck-Boost mode. This is the most exible mode as it allows the input voltage to be below, the same, or
above the output voltage. This mode is recommended for loads with up to 6 LEDs in series.
When the dimming wires (purple/gray) are left unconnected, the FlexBlock is designed to supply its rated
current to one or more LED junctions. For example, a 700mA rated unit will drive up to ve white 700mA
LEDs connected in series at 12V
DC
. See gure 2 and gure 3.
A second, more ecient wiring option puts the A011 FlexBlock in boost-only mode. In this mode, the
LED+ output is not used, and the positive end of the LED load is instead connected to Vin+. This is shown in
Figure 11. It is extremely important that Vin < Vout under all conditions (LED forward voltages shrink slightly
as the LEDs warm up and as the LEDs are dimmed). If white LEDs are going to be dimmed, it is recommended
that Vin be less than (2V * #LEDs in series) to make sure the LEDs can be fully extinguished. This is due to the
fact that many LEDs will begin to light up at around 2.5V, at a reduced current, even when rated at 3.0Vf.
Preliminary
©2011 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2011 - Rev 1.0
M
a
d
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n
t
h
e
U
S
A
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
Figures 14 and 15 show the ease of dimming the A011 FlexBlock
TM
High Output LED Power Module. Figure
14 shows the simplest dimming conguration using a 20K Ohm potentiometer. This gives a 0%, 5-100%
range of dimming. See gure 9. If multiple A011 modules are to be dimmed with a single potentiometer,
the value of the potentiometer should be approximately (20KΩ/N) where N is the number of modules.
Adjustable Current - External Control - “V” Model
Figure 9.
Output vs. Dim Voltage
V
in
Purple
Gray
0.5mA
10V
Figure 8.
Dimming input equivalent circuit
Figure 15 shows a 0-10V wall dimmer, such as the LEDdynamics A019 Low Voltage Dimming Control , being
used to control the LED brightness. This is the preferred choice for dimming multiple units, as the 0-10V
dimming control can handle several drivers. The 0-10V input can also be supplied by a commercial lighting
controller that has current-sinking 0-10V outputs, allowing the integration of LEDs with other forms of
lighting in large automated systems.
For large systems where several distant FlexBlock modules will be dimmed together, it is imporant to use a
heavier gauge wire (such as 18AWG) to run the DIM lines in a star wiring pattern (where each module has a
run all the way back to the 0-10V dimming control). This will help to negate any voltage drops along the DIM
wires that could cause some lamps to dim dierently than others.
For more advanced control, the 0-10V input can be Pulse Width Modulated (PWM). Figure 18 shows how
interfacing with a microcontroller can easily be accomplished with a 2N3904 or equivalent transistor. A PWM
frequency of 200Hz is recommended. This conguration can also be used to strobe or pulse the LEDs with a
TTL or CMOS logic signal.
In addition to the congurations described above, the FlexBlock may also be driven by a D to A converter.
The D/A converter must be able to sink at least 1ma of current from the 0-10V input of the FlexBlock. If the
D/A converter cannot sink current, a voltage follower with an open collector output should be used between
the D/A coverter and the 0-10V input.
If the dimming control circuit used with the FlexBlock has the potential to exceed 10V, current into the DIM
input needs to be limited to 10mA or less. See gure 8.
To Dimming
Circuit
High Output Wide Range LED Power Module
A011 FlexBlock
TM
DATA SHEET Page 5 of 9
Preliminary
©2011 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2011 - Rev 1.0
M
a
d
e
i
n
t
h
e
U
S
A
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
Connections
Where a manual on/o control is desired, the potentiometer in Figure 14 may be replaced by a
pushbutton or toggle switch. The output current will be zero and the input current will drop to the
quiescent level when the switch is closed. Figures 16 and 17 show external dimming control combined
with on/o control.
External On/O Control
The FlexBlock can run many LED load congurations with no additional heat sinking in an ambient of
25°C. In situations with elevated ambient temperatures, such as those that might be experienced inside
an enclosed xture, additional heat sinking may be required. If the temperature of the driver (as
measured at the T marking on the label) exceeds 60°C, additional heat sinking is recommended. If the
temperature of the driver exceeds 80°C, additional heat sinking is required.
The best surface for removing heat form the FlexBlock is the back side (opposite the labeled side). The
module can be attached to a heat sink with thermal grease and a mounting bracket that presses the unit
rmly against the heat sink, or with double-sided tape that provides both the thermal path and
mechanical mounting. When using tape (such as 3M F9469PC, a Very High Bond (VHB) tape suitable for
permanent mounting), using a thinner variety (0.005” thick or less) will aid in getting the heat through
the tape and to the heat sink. Care should be taken when positioning the FlexBlock module with VHB
tape as the high bond strength makes removing or repositioning the module very dicult.
If the FlexBlock becomes too hot during use, it will reduce the output current to limit the power
dissipation. If the temperature continues to rise, the driver will turn o until the temperature drops to a
safe level.
Thermal Management
In all cases, the LEDs being driven should be located as close to the FlexBlock LED output as possible.
18AWG wire should be adequate for most wiring, but a heavier gauge should be considered when
long leads are required.
The power input wires should also be kept short. Where the power source is located several feet from the
unit, a 100μF or larger, 50V capacitor may be required across the input terminals as shown in Figure 20.
High Output Wide Range LED Power Module
A011 FlexBlock
TM
DATA SHEET Page 6 of 9
P1-P3P4-P6P7-P9

A011-D-V-700

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