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BuckBlock - 2100mA Constant Current LED Driver with Dimming

BuckBlock - 2100mA Constant Current LED Driver with Dimming
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PART #: 0A009-D-V-2100
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Product Details

Featured Specifications

Max Output Current: 2100mA External Analog/Digital Intensity Control
Max Input Voltage: 32VDC External Potentiometer Intensity Control (0-100%)
Min Input Voltage: 10VDC Continuous Output Short Circuit Protection
0-10V Dimming Compatible Continuous Output Open Circuit Protection
Small form factor 2.0"x1.2"x0.38" Input Reverse Polarity Protection with Polarifet? Technology



The LuxDrive™ A009-D-V-2100 BuckBlock™ LED power module is a high output wide range constant current LED driver for powering high-brightness (HB) LEDs at 2100mA. Where standard power supplies deliver a fixed voltage to the output, the BuckBlock is engineered to produce a fixed current (2100mA). The output voltage will adjust as required to maintain the specified output current with differing forward voltage drops of LEDs. The BuckBlock features a fast response current-sensing circuit enabling the device to flash or strobe LEDs and the output from the BuckBlock includes external dimming using common 0-10V low voltage dimmers. The driver is extremely low profile, fully potted and comes with six inch 18AWG colored leads, making installation into tight spaces fast and easy.


Technical Documentation

Part Number Identification Table:
Part Number DC Input Drive Current (mA) Dimming Connection Type
A011-D-V-350 10-32V 650 0-10V 6 Wires
A011-D-V-500 10-32V 500 0-10V 6 Wires
A011-D-V-700 10-32V 700 0-10V 6 Wires
Absolute Maximum Ratings:
Input Voltage 32VDC
Output Voltage 48VDC
DIM Input 10V
Typical Characteristics:
Output Tolerance ±10%
Efficiency 90%
Input Voltage Minimum 10VDC
Max Output Voltage in Buck-Boost Mode (Default) 48VDC - Vin
Max Output Voltage in Boost Only Mode 48VDC
Output current, A011-D-V-350 350mA
Output current, A011-D-V-500 500mA
Output current, A011D-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%2
Output rise time less than 2ms3
Output fall time less than 100 μs3
Quiescent current (DIM = 0V) less than 6 mA3
Operating temperature (Tcase) -40-+80°C
Storage temperature -40-+125°C


Important Information


Application Information: The FlexBlockTM High Output LED Power Module is a high-efficiency dc to dc converter that delivers a fixed output current by varying the output voltage as required to maintain the specified 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 flashing 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.

Fixed Current Drive: 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 five white 700mA LEDs connected in series at 12VDC. See figure 2 and figure 3.

When wired in the default configuration, as marked on the top of the unit, the A011 FlexBlock is in Buck-Boost mode. This is the most flexible 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.

A second, more efficient 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.

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 sufficient current sharing if the parallel strings comprise three or more junctions each, and are identical in length.

Adjustable Current - External Control: Figures 14 and 15 show the ease of dimming the A009 BuckBlockTM High Output LED Power Module. Figure 14 shows the simplest dimming configuration using a 20K Ohm potentiometer. This gives a 0-100% range of dimming. If multiple A009 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.

Figure 15 shows a 0-10V wall dimmer, such as 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 dimmer 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 BuckBlock modules will be dimmed together, it is important 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 dimmer). This will help to negate any voltage drops along the DIM wires that could cause some lamps to dim differently than others.

For more advanced control, the 0-10V input can be Pulse Width Modulated (PWM). Figure 18 shows how interfacing with a micro-controller can easily be accomplished with a 2N3904 or equivalent transistor. A PWM frequency of 200Hz is recommended. This configuration can also be used to strobe or pulse the LEDs with a TTL or CMOS logic signal.

In addition to the configurations described above, the BuckBlock 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 BuckBlock. If the D/A converter cannot sink current, a voltage follower with an open collector output should be used between the D/A converter and the 0-10V input.

If the dimming control circuit used with the BuckBlock has the potential to exceed 10V, current into the DIM input needs to be limited to 10mA or less. See figure 8.

External On/Off Control: Where a manual on/off control is desired, the potentiometer in Figure 14 may be replaced by a push-button 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/off control.

Thermal Management: The FlexBlock can run many LED load configurations 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 fixture, 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 firmly 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 re-positioning the module very difficult.

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 off until the temperature drops to a safe level.

Connections: 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.

Note: The above are product highlights and not the complete manufacturers datasheet. Please view the .pdf for complete specifications.


Full Documentation

Full Documentation

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Product Reviews

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Reviewed by
01/26/2014 - 10:39:42 PM
XML2 Driver
I used 15 of these drivers for an LED light bar with 30 XML2 LEDs. The drivers work great and the light bar is ridiculously bright. I have had one of these drivers running a pair of XML LEDs 24 hours a day for almost 3 years for testing purposes. They are great. I'm hoping they make a 3000ma version someday.
Reviewed by
01/17/2014 - 05:00:22 PM
First use
I have used the older LED Drivers hundereds of times, but this was my first try with the new Buckblock led driver. The size was incredibly small, but still robust enough to dissipate the heat. I drove a few strings of LEDs in parallel, which helped save the cost of buying a second or third driver. so far so good. I also used the 0-10V dimming and am surprised how linear the output is. Very good product and the guys at ledsupply were very helpful in explaining the product. thanks again guys!
Reviewed by
01/15/2014 - 03:08:13 PM
Great for the XML
This driver is a great fit with the Cree XML. I like to be a little on the cautious side when it comes to driving LEDs. The 2100mA output of this driver allows me to get awesome light output while stay just enough below the maximum drive current. The dimming feature is nice and easy to use too. I would definitely recommend this product!
Customer Reviews
I had a couple technical questions, I called LED Supply and talked to David. He was very knowledgeable & helpful. I placed two orders, about a week apart, both shipped the day I placed t...
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