The 3023 has permanently attached wires
Optional on-board trim
adjustment (40-110%)
7-Pin SIP through-hole
PCB mounting
3021
BuckPuck
with optional
wiring harness
(3021HEP)
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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802.728.4533 P
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www.LUXdrive.com
Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 1 of 8
Product Overview
RoHS
C o m p l ia n t
2 0 0 2 / 9 5 / E C
Pb
Typical ApplicationsFeatures
DC or AC input voltage up to 32V (24VACRMS)
350mA, 500mA, 700mA, or 1.0A constant current output*
Extremely small form factor* (0.83”x0.83”x0.43”)
The 3021 has a simple 7-pin SIP connection for through-hole
PCB mounting or use with an optional wiring harness (3021Hx)
External analog/digital intensity control (TTL compatible)
Optional external potentiometer intensity control (0-100%)
Optional on-board trim adjustment (40-110%)
Output short circuit protection up to 15 seconds
Output open circuit protection
Pulse and strobe capable (control input)
Built-in 5V reference/output to power logic circuitry or µProcessor
Solar & Landscape Lighting
Architectural Lighting
Track Lighting
Automotive & Marine Lighting
Portable Lighting & Flashlights
Point of Purchase Lighting
Desk & Reading Lamps
Signal & marker Lighting
Flashing & Strobe Lighting
Cabinet & Display Case Lighting
Sign & Channel Letters
Much More...
The 3021 and 3023 BuckPuck LED Power Modules are a line of true
current regulated drivers for powering LEDs. The BuckPuck line of
LED drivers is the ideal choice for powering all types of high-
brightness and high-power LED Packages and LED arrays.
The line of BuckPuck LED drivers exhibit high eciency and require
no external current limiting resistors or additional heat sinking for
operation. A fast response current-sensing circuit makes the 3021
and 3023 ideal for applications where ashing or strobe operation of
the LED(s) is required.
A wide range of options are available including external dc analog
voltage intensity control, TTL/CMOS logic level on/o control (”E”
Version), and set-and-forget internal current limiting (”I” Version).
The standard units are fully potted in an extremely small form factor*
and are provided with a simple 7 pin SIP connection for through-hole
PCB mounting (3021) or 6” 24AWG Colored Leads (3023).
The 3021 and 3023’s built-in regulated 5V reference (E and I versions)
can provide output to power logic circuitry or microprocessor,
eliminating the need for an additional power supply on the circuit board.
* - Custom units can be designed for OEM applications. Contact LUXdrive for more information.
Output Voltage .............................32VDC
Control Pin Voltage ..........................10V
Reference regulator current (5VDC) Output . . . . . . . . 20mA
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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LEDdynamics, Inc.
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Absolute Maximum Ratings
Typical Characteristics
XXXX - Output current rating in milliamperes (mA): 350, 500, 700, 1000 or special order factory custom rating
Input Voltage, DC Model . . . . . . . . . . . . . . . . . . . . . 32VDC
Input Voltage, AC Model . . . . . . . . . . . . . . . . . . . . . 24VRMS
Output tolerance (within specied temp. range)......... ±10%
Eciency.................................95%
Input Voltage Minimum . . . . . . . 5VDC (N), 7VDC (E or I), 7VRMS
Input Margin (350mA unit1, add to LED Vf MAX)........ 2.5VDC, 4VRMS
LED +
Ctrl
Ref
Vin+
LED -
Vin -
3021
3023
Figure 2.
Eciency vs. Vin
Figure 3.
Output current vs. control voltage
Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 2 of 8
DC Input
7-32V
7-32V
5-32V
5-32V
7-32V
Part Number
3021-D-E-xxxx
3023-D-N-xxxx
3021-D-I-xxxx
3023-D-E-xxxx
3021-D-N-xxxx
On-Board
Trim
no
no
yes
no
no
Control/
Dimming
no
yes
yes
no
yes
Connection
Type
7-Pin SIP (4 Pins)
7-Pin SIP (6 Pins)
7-Pin SIP (6 Pins)
4 Wires
6 Wires
Table 1
Product Selection
Figure 1.
Bottom view Pinout of the
3021/3023 BuckPuck
Part Number Identication Table
1 - Margin increases
with higher current units.
AC Input
no
no
no
no
no
no
no
no
3021-A-E-xxxx
3021-A-I-xxxx
3021-A-N-xxxx no
no
yes
no
yes
yes
7-Pin SIP (4 Pins)
7-Pin SIP (6 Pins)
7-Pin SIP (6 Pins)
7-24VRMS
7-24VRMS
7-24VRMS
no3023-A-N-xxxx no no 4 Wires7-24VRMS
3023-D-E-xxxxP 7-32V no yes 6 Wiresno
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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LEDdynamics, Inc.
802.728.4533 P
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sales@LUXdrive.com
www.LUXdrive.com
Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 3 of 8
Application Information
Output current, 3021-x-x-350, 3023-x-x-350, 350P, 500P, 700P, 1000P. . . . ..........350mA1
Output current, 3021-x-x-500, 3023-x-x-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA1
Output current, 3021-x-x-700, 3023-x-x-700 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mA1
Output current, 3021-x-x-1000, 3023-x-x-1000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mA1
Control Pin, adjustment threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......1.65 V ±5%
Control Pin, shuto threshold .......................................... . 4.2 V ±5%
Control Pin, propagation delay to output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <15 µs
Control Pin, input impedance ...........................................1.5k ohm
Reference voltage (Vin= 7V or greater) ................................... . . 5 VDC ±5%2
Optional trim pot adjustment range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . 40%-110%
External pot adjustment range ..........................................0%,1-100%2
Maximum ash frequency..............................................10 kHz
Minimum strobe pulse width............................................50 µs
Output rise time .................................................
....<10 µs3
Output fall time......................................................<350 µs3
Quiescent current (no load or control pin high) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..<4.5 mA3
Operating temperature (Tcase)...........................................-40-+80°C
Storage temperature..................................................-40-+125°C
Description
Fixed Current Drive
The 3021/3023 Wide Range LED Power Module is a high eciency dc to dc converter which delivers a xed output
current by varying the output voltage as required to maintain the specied 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
The xed output versions of the 3021/3023 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.
Figures 4 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 ensure current sharing. The nature of the LEDs
themselves will provide sucient current sharing if the parallel strings comprise of 3 or more junctions each.
1 - Measured with single emitter; output current drops slightly with additional series junctions to limit maximum power dissipation.
2 - When Vin > 7VDC
3 - Actual value varies greatly based on input and/or output voltages. Value shown is for Vin = 24VDC VOUTt=20VDC LED load. Actual values will be smaller in most applications.
Specications
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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LEDdynamics, Inc.
802.728.4533 P
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Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 4 of 8
Adjustable Current - On-Board Control - “I” Model
Where the ability to adjust the output current to an intermediate value is required, all output cur
rent ratings are
available with an on-board potentiometer. This permits the output current to be varied from approximately 40%
to 110% of the rated value. When measuring the output is required to determine a particular set point, the
following method is recommended:
Temporarily place a 0.1 ohm, 1% resistor in series with the LEDs.
Read the voltage across the 0.1 ohm resistor.
The voltage, in millivolts X 10, will equal the output current in mA.
Because there is a small, high-frequency component in the 3021/3023 output, many multi-meters may give an
incorrect reading when used in the current mode. It has been found that the method described above yields a far
more accurate measurement.
The potentiometers used for the on-board adjustable units are rated for a limited number of rotatio
ns (typically
100) and are intended for "set it and forget it" applications. Where frequent adjustments of output current are
needed, the use of units with external adjustment capabilities is recommended.
Figures 10 and 11 show external adjustment congurations. 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 conguration, 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 so
urce ground must be common to the LED- output pin. In either conguration, 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.
Where a manual on/o control is desired, the potentiometer in Figures 10 and 11 may be replaced by a pushbutton
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.
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 3021/3023. 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 conguration using a 2N3906 or other PNP switching transistor. In this case, a
logic high will cause the output to be "on". In either conguration, the rise time of the output will be 10µsec or
less. A pulse frequency up to 10kHz may be used.
Adjustable Current - External Control - “E” Model
External On/O Control
External Pulse/Strobe Control
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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Microprocessor Control
Other Control Applications
Connections
Figure 16 shows a typical interface for a Microchip PIC® or similar µcontroller. The reference output provides the
operating voltage for the processor (5V at up to 20mA current).
In addition to the congurations described above, the 3021/3023 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 eective
control range of the analog input signal.
In all cases, the LEDs being driven should be located as close to the 3021/3023 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 220µF, 50V capacitor should be placed across the input terminals as shown in Figure 18.
For applications where the use of header pins is inconvenient, a mating connector with 6" leads is available as an
accessory, or the 3023 part number may be used, which is supplied with 6” colored leads.
3021HN - Harness for “N” type (4-wire)
3021HE - Harness for “E” & “I” type (6-wire)
3021HEP - Harness for “E” & “I” w/pot (6-wire w/pot)
Application Figures
Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 5 of 8
3021/3023
LED+
LED-
Vin
3021/3023
LED+
LED-
Vin
Figure 4.
700 mA unit driving 6 High Power LEDs
(VIN > 12VDC)
Figure 5.
700mA unit driving 12 High Power LEDs
(VIN > 24VDC)
Figure 8.
700mA unit driving one Cree MC-E emitter
(VIN > 8VDC)
Figure 9.
700mA unit driving three High Power LEDs
at 2W each (VIN > 12VDC)
Figure 9.
External potentiometer using internal
reference
Figure 10.
External potentiometer using external voltage
source
* - Luxeon is a registered trademark of LumiLEDs Corporation
Figure 6.
1000mA unit driving nine High Power LEDs
at 1W each (VIN > 12VDC)
Figure 7.
1000mA unit driving three High Power LEDs
at 3W each (VIN > 12VDC)
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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LEDdynamics, Inc.
802.728.4533 P
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Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 6 of 8
3021/3023
LED+
LED-
Vin
3021/3023
LED+
LED-
Vin
3021/3023
LED+
LED-
Vin
3021/3023
LED+
LED-
Vin
3021/3023
LED+
LED-
Vin
CTRL REF
5K CW
3021/3023
LED+
LED-
Vin
CTRL
5K CW
EXT 5V
SOURCE
-
+
Figure 10.
External potentiometer using internal
reference
Figure 11.
External potentiometer using external voltage
source
Figure 15.
Interface to PIC or other microcontroller
Figure 16.
Using resistor for fixed current reduction
Output is approximately: %IOUT = R1/50
Figure 14.
Pulse/Strobe input 5V=OFF
Figure 15.
Pulse/Strobe input 5V=ON
Figure 12.
External dimming plus ON/OFF control with
switch closure
Figure 13.
External dimming plus ON/OFF control with
logic level input
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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LEDdynamics, Inc.
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www.LUXdrive.com
Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 7 of 8
3021/3023
LED+
LED-
Vin
CTRL
TTL/CMOS
COM
3021/3023
LED+
LED-
Vin
CTRL REF
R1
3021/3023
LED+
LED-
Vin
CTRL REF
5K CW
3021/3023
LED+
LED-
Vin
CTRL REF
Vcc
I/O
GND
0.1µf
Other
I/O Lines
Figure 16.
Interface to PIC or other microcontroller
Figure 17.
Using resistor for xed current reduction
Output is approximately: %IOUT = R1/50
3021/3023
LED+
LED-
Vin
CTRL REF
5K CW
LO = OFF
HI = ON
5K
5K
2N3906
3021/3023
LED+
LED-
Vin
CTRL REF
LO = OFF
HI = ON
5K
5K
2N3906
23.1 mm
[0.91”]
Figure 18.
Place a capacitor across the input terminals when the distance to the DC
power source is greater than 18 inches
Physical Dimensions
Shown approximately actual size
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Specications subject to change without notice. May, 2013 - Rev 3.1
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LEDdynamics, Inc.
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Wide Range LED Power Module
3021/3023 BuckPuckTM
DATA SHEET Page 8 of 8
3021/3023
LED+
LED-
Vin
CTRL REF
≈≈
19.8 mm [0.78”]
21.0 mm [0.83”]
11.0 mm
[0.43”]
5.8 mm
[0.23”]
Pin Size 0.76mm [0.03”] Square
Pin Spacing 2.5mm [0.10”] OC
2.5 mm
[0.10”]
2.0 mm
[0.08”]
3021 3023
6” - 24AWG Colored Leads
Recommended
clearance envelope
3.0 mm
[0.12”]
[0.12”]
3.0 mm
23.1 mm
[0.91”]
