Wired BuckPuck - 1000mA Constant Current LED Driver with Potentiometer
|Max Output Current: 1000mA||Output short circuit protection up to 15 seconds|
|Max Input Voltage: 32VDC||Output open circuit protection|
|Min Input Voltage: 7VDC||Small form factor .78"x.78"x.43"|
|6" 24ga colored wires for easy wiring||Weighs 8.1grams|
|External Dimming Control w/ Potentiometer||ROHS Compliant - Lead Free|
|Drive up to 18 1W LEDs & up to 6 3W LEDs||Wired 5K potentiometer for dimming|
The Wired BuckPuck line of LED drivers is the ideal choice for powering all types of high-brightness LEDs and LED arrays. The 3023 series 1000mA BuckPuck from LUXdrive is a current regulated LED driver, designed to automatically vary its output voltage as the forward voltage of an LED changes, while maintaining a constant 1000mA current output. The "P" version includes an attached 5K turn knob potentiometer for manual dimming.
The line of BuckPuck 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 3023 ideal for applications where ashing or strobe operation of the LED(s) is required. Included is external dc analog voltage intensity control, TTL/CMOS logic level on/off control, and a built-in regulated 5V reference providing output to power logic circuitry or a microprocessor, eliminating the need for an additional power supply on the circuit board. The standard units are fully potted in an extremely small form factor and are provided with 6" 24 AWG stranded wire.
|Part #||DC Input||AC Input||On-Board Trim||Control/Dimming||Connection Type|
|3021-D-N-xxxx||5-32V||no||no||no||7-Pin SIP (4 Pins)|
|Input Voltage, DC Model||32VDC|
|Input Voltage, AC Model||24VDCRMS|
|Control Pin Voltage||10V|
|Reference regulator current (5VDC) Output||20mA|
|Input Voltage Minimum||5VDC (N) 7VDC (E or I)|
|Input Margin (350mA unit1, add to LED Vf MAX)||2.5VDC, 4VRMS|
|Output current, 3021-x-x-350, 3023-x-x-350||350mA|
|Output current, 3021-x-x-500, 3023-x-x-500||500mA|
|Output current, 3021-x-x-700, 3023-x-x-700||700mA|
|Output current, 3021-x-x-1000, 3023-x-x-1000||1000mA|
|Control Pin, adjustment threshold||1.65 V ±5%|
|Control Pin, shutoff threshold||4.2 V ±5%|
|Control Pin, propagation delay to output||15 s|
|Control Pin, input impedance||1.5k ohm|
|Reference voltage (Vin= 7V or greater)||5 VDC ±5%|
|Optional trim pot adjustment range||40%-110%|
|External pot adjustment range||0%,1-100%2|
|Maximum flash frequency||10 kHz|
|Minimum strobe pulse width||50 s|
|Output rise time||10 s|
|Output fall time||350 s|
|Quiescent current (no load or control pin high)||4.5 mA|
|Operating temperature (Tcase)||-40-+80°C|
Application Information: The 3023 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 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
Fixed Current Drive: The fixed output versions of the 3023 are designed to supply their rated current to one or more LED junctions. For example, a 350 mA rated unit will drive up to six white 350mA LEDs connected in series at 24VDC. Due to the nature of the buck regulator, the input voltage must always be higher than the total forward voltage drop of the LED junction(s) connected in series (2.5V for DC models, 4V for AC models). Thus, for a series string of six junctions having an average forward drop of 3.5V each, the required minimum input voltage will be 23.5VDC. A standard 24VDC power supply is a good choice for this application.
Adjustable Current - External Control - "E" Model: Figures 10 and 11 show external adjustment configurations; both use a 5Kohm, linear taper potentiometer. In Figure 10, the potentiometer is connected between the internal 5VDC reference (Ref) output and the control (Ctrl) input. When using this configuration, it is important that Vin be 7VDC or higher. Figure 11 shows the control potentiometer being powered by an external 5VDC source. When using an external power source for the potentiometer, the source ground must be common to the LED output pin. In either configuration, connect the potentiometer such that clockwise rotation increases the resistance. Note that, because the current through the potentiometer is less than 5mA, a low power potentiometer may be used.
External On/Off Control: Where a manual on/off control is desired, the potentiometer in Figures 10 and 11 in the documentation may be replaced by a push-button or toggle switch. The output current will be zero when the switch is closed. Figures 12 and 13 show external dimming control combined with on/o control. The circuit in Figure 13 uses a 2N3906 or equivalent PNP switching transistor.
External Pulse/Strobe Control: Figures 14 and 15 show two methods for low speed pulsing or high speed ashing operation. In Figure 14, a 5V TTL/CMOS logic signal is applied directly to the control (Ctrl) input of the 3023. 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 1.5Kohm input impedance. Also, as is the case with a dc control signal, the logic input ground should to be common to the LED output terminal.
Figure 15 shows an inverted input configuration using a 2N3906 or other PNP switching transistor. In this case, a logic high will cause the output to be "on". In either configuration, the rise time of the output will be 10 sec or less. A pulse frequency up to 10kHz may be used.
Microprocessor Control: Figure 16 shows a typical interface for a Microchip PIC® or similar controller. The reference output provides the operating voltage for the processor (5V at up to 20mA current).
Other Control Applications: In addition to the configurations described above, the 3023 may also be driven by a D to A converter. As in the cases above, the analog control signal should have its ground common to LED-. Figure 2 shows the effective control range of the analog input signal.
Connections: In all cases, the LEDs being driven should be located as close to the 3023 LED output as possible. When the use of long leads is required, use heavier gauge wire. For strobe or pulse applications, a wire length not exceeding 6" should be used to maintain accurate timing.
The power input wires/traces should also be kept short. Where DC input units are located more than 18" from the source, a 220mF, 50V capacitor should be placed across the input terminals as shown in Figure 18.
Note: The above are product highlights and not the complete manufacturers datasheet. Please view the .pdf for complete specifications and images of all the figures referenced.
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01/30/2014 - 09:33:48 AM