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High Power Constant Current LED Driver Dimmable
Total Power ------------------- 36 Watts max
Input voltages ----------------- 5 ~ 30 Vdc |
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| Product Overview: |
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The BUCKxx LED Power Modules are a line of true current regulated drivers for powering LEDs.The BUCKxx line of LED drivers are the ideal choice for powering all types of high-brightness and high-power LED Packages and LED arrays.
The line of BUCKxx LED drivers exhibit high efficiency and require no external current limiting resistors or additional heat sinking for operation.
A fast response current-sensing circuit makes the BUCKxx ideal for applications where flashing or strobe operation of the LED(s) is required.
A wide range of options are available including DC input,TTL/CMOS logic level on/off control. |
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| Features: |
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DC input power up to 30V |
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350mA ,700mA ,1.0A ,1.2A ,1.5A ,2.0A constant current output |
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Extremely small form factor |
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Simple connection for through-hole PCB mounting or use with optional wiring harness |
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External digital intensity control (TTL compatible) |
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Output short circuit protection |
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Output open circuit protection |
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Pulse and strobe capable (DIM input) |
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| Typical Applications: |
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Solar & Landscape Lighting |
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Architectural Lighting |
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Track Lighting |
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Automotive & Marine Lighting |
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Portable Lighting & Flashlights |
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Point of purchase Lighting |
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Desk & Reading Lamps |
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Signal & marker Lighting |
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Flashing & Strobe Lighting |
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Cabinet & Display Case Lighting |
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Sign & Channel Letters |
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Much More ……… |
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| ENVIRONMENTAL: |
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Operating temperature ----------------------------- - 40℃ to + 65℃ |
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Storage temperature -------------------------------- - 40℃ to + 85℃ |
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Humidity (Non – Condensing) ------------------ 5% to 95% |
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Cooling ----------------------------------------------- Convention |
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Vibration Frequency -------------------------------- 5 to 50 HZ |
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MTBF ----------------------------------- >100,000 Hours at full load and 25℃ ambient conditions (MIL-217F) |
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| Absolute Maximum Ratings: |
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Input voltage --------------------- 30Vdc |
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Output Voltage -------------------- 30Vdc |
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DIM Pin Voltage ------------------- 10Vdc |
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| Typical Characteristics: |
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Output tolerance (within specified temp. range) ----------- ± 7.5% |
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Efficiency ----------------------------------------- 95% |
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Input Voltage Minimum ------------------------------ 5Vdc |
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Input Margin (add to LED Vf max) ---------------------- 0.8Vdc |
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| Application Information: |
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Description |
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The BUCKxx Wide Range LED Power Module is a high efficiency dc to dc converter which delivers a fixed output current by varying the output voltage as required to maintain the specified current. 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 |
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Fixed Current Drive |
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The fixed output versions of the BUCKxx are designed to supply their rated current to one or more LED junctions.
For example, a 350mA rated unit will drive up to six Luxeon* Ⅰ LEDs connected in series. Due to the nature of the buck requlator,the input voltage must always be higher than the total forward voltage drop of the LED junction(s)
Connected in series . Thus,for a series string of six junctions having an average forward drop of 3.5V, the required minimum input voltage will be 21 Vdc. A standard 24Vdc power supply is a good choice for this application.
Figures 3 through 6 show 700mA and 1000mA rated units 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 good current sharing if the parallel strings comprise 3 or more junctions each. Figure 7 shows a 700mA unit driving a Luxeon* V. This could also represent a 350mA unit driving a Luxeon* Ⅰ,a 1000
mA unit driving Luxeon* Ⅲ.
* - Luxeon is a registered trademark of LumiLEDs Corporation |
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External Pulse /Strobe Control |
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Figures 9 show a method for low speed pulsing or high speed flashing operation.And a TTL/CMOS logic signal is applied directly to the dimmer(DIM) input of the BUCKxx. The output current will be zero when the control signal is high. Note that the input needs to source a minimum of 4.75Vdc into a 1K ohm input impedance. Also, as is the case with a dc control signal,the logic input ground should to be common to GND. |
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Microprocessor Control |
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Figure 10 shows a typical interface for a microchip PIC or similar μcontroller. |
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Connections |
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The power input wires/traces should also be kept short. Where DC input units are located more than 18” from the source, a 220μF, 50V capacitor should be placed across the input terminals as shown in Figure 11. |
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| Application Figures: |
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Figure 3.
700mA unit driving LumiLEDs 6-ring
( VIN ≧ 12Vdc) |
Figure 4.
700mA unit driving LumiLEDs 12-ring
(VIN≧24Vdc, IOUT limited to 600mA) |
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Figure 5.
1000mA unit driving nine Luxeon* I emitters
( VIN ≧ 12Vdc ) |
Figure 6.
1000mA unit driving three Luxeon* II I
emitters ( VIN ? 12V dc ) |
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| * - Luxeon is a registered trademark of LumiLEDs Corporation |
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Figure 7.
700mA unit driving one Luxeon* V
emitter ( VIN ≧ 8Vdc ) |
Figure 8.
700mA unit driving three Luxeon* V
emitters
( VIN ≧ 24Vdc ) |
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Figure 9.
Pulse / Strobe input 5V = OFF |
Figure 10.
Interface to PIC or other microcontroller |
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Figure 11.
Place a capacitor across the input terminals when the distance to the DC power source is greater than 18 inches. |
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| * - Luxeon is a registered trademark of LumiLEDs Corporation |
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