3021/3023 BuckPuck
Wide Range LED Power Module
DATA SHEET Page 1 of 8
TM
Product Overview
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 e ciency 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.
Features
DC or AC input voltage up to 32V (24VAC
RMS
)
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)
The 3023 has permanently attached wires
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
Typical Applications
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...
Pb
7-Pin SIP through-hole
PCB mounting
Optional on-board trim
adjustment (40-110%)
* - Custom units can be designed for OEM applications. Contact LUXdrive for more information.
3021
BuckPuck
with optional
wiring harness
(3021HEP)
RoHS
C o m p lia n t
2002/95/EC
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Speci cations subject to change without notice. May, 2013 - Rev 3.1
Made
in
the
USA
3021/3023 BuckPuck
Wide Range LED Power Module
DATA SHEET Page 2 of 8
TM
Part Number Identi cation Table
Part Number
3021-D-N-xxxx
3021-D-E-xxxx
3021-D-I-xxxx
3023-D-N-xxxx
3023-D-E-xxxx
3021-A-N-xxxx
3021-A-E-xxxx
3021-A-I-xxxx
3023-A-N-xxxx
5-32V
7-32V
7-32V
5-32V
7-32V
no
no
no
no
Table 1
Product Selection
On-Board
Trim
DC Input AC Input
no
no
no
no
no
7-24V
RMS
7-24V
RMS
7-24V
RMS
7-24V
RMS
Control/
Dimming
Connection
Type
no
no
yes
no
no
no
no
yes
no
no
yes
yes
no
yes
no
yes
yes
no
7-Pin SIP (4 Pins)
7-Pin SIP (6 Pins)
7-Pin SIP (6 Pins)
4 Wires
6 Wires
7-Pin SIP (4 Pins)
7-Pin SIP (6 Pins)
7-Pin SIP (6 Pins)
4 Wires
XXXX - Output current rating in milliamperes (mA): 350, 500, 700, 1000 or special order factory custom rating
Absolute Maximum Ratings
Typical Characteristics
Input Voltage, DC Model . . . . . . . . . . . . . . . . . . . . . 32V
DC
Input Voltage, AC Model . . . . . . . . . . . . . . . . . . . . . 24V
RMS
Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32V
DC
Control Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 10V
Reference regulator current (5V
DC
) Output . . . . . . . . 20mA
Output tolerance (
within speci ed temp. range
) . . . . . . . . . ±10%
E ciency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95%
Input Voltage Minimum . . . . . . . 5V
DC
(N), 7V
DC
(E or I), 7V
RMS
Input Margin (
350mA unit
1
, add to LED Vf MAX
). . . . . . . . 2.5V
DC
, 4V
RMS
3021
3023
LED +
LED -
Ctrl
Ref
Vin+
Vin -
Figure 1.
Bottom view Pinout of the
3021/3023 BuckPuck
1 - Margin increases
with higher current units.
Figure 2.
E ciency vs. Vin
Figure 3.
Output current vs. control voltage
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Speci cations subject to change without notice. May, 2013 - Rev 3.1
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
Made
in
the
USA
3021/3023 BuckPuck
Wide Range LED Power Module
DATA SHEET Page 3 of 8
TM
Speci cations
Output current, 3021-x-x-350, 3023-x-x-350 . .
Output current, 3021-x-x-500, 3023-x-x-500 . .
Output current, 3021-x-x-700, 3023-x-x-700 . .
Output current, 3021-x-x-1000, 3023-x-x-1000
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350mA
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mA
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mA
1
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 (V
in
= 7V or greater) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V
DC
±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 µs
3
Output fall time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <350 µs
3
Quiescent current (no load or control pin high) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <4.5 mA
3
Operating temperature (Tcase). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40-+80°C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40-+125°C
Application Information
Description
The 3021/3023 Wide Range LED Power Module is a high e ciency dc to dc converter which delivers a xed output
current by varying the output voltage as required to maintain the speci ed 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 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 24V
DC
. 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 23.5V
DC
. A standard
24V
DC
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 su cient 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 V
in
= 24V
DC
V
OUTt
=20V
DC
LED load. Actual values will be smaller in most applications.
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Speci cations subject to change without notice. May, 2013 - Rev 3.1
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
Made
in
the
USA
3021/3023 BuckPuck
Wide Range LED Power Module
DATA SHEET Page 4 of 8
Adjustable Current - On-Board Control - “I” Model
TM
Where the ability to adjust the output current to an intermediate value is required, all output current 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 rotations (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.
Adjustable Current - External Control - “E” Model
Figures 10 and 11 show external adjustment con gurations. Both use a 5Kohm, linear taper potentiometer. In
Figure 10, the potentiometer is connected between the internal 5V
DC
reference (Ref) output and the control (Ctrl)
input. When using this con guration, it is important that Vin be 7V
DC
or higher. Figure 11 shows the control
potentiometer being powered by an external 5V
DC
source. When using an external power source for the
potentiometer, the source ground must be common to the LED- output pin. In either con guration, 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/O Control
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.
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 3021/3023. The output current will be
zero when the control signal is high. Note that the input needs to source a minimum of 4.75V
DC
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 con guration using a 2N3906 or other PNP switching transistor. In this case, a
logic high will cause the output to be "on". In either con guration, the rise time of the output will be 10µsec or
less. A pulse frequency up to 10kHz may be used.
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Speci cations subject to change without notice. May, 2013 - Rev 3.1
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
Made
in
the
USA
3021/3023 BuckPuck
Wide Range LED Power Module
DATA SHEET Page 5 of 8
Microprocessor Control
TM
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).
Other Control Applications
In addition to the con gurations 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 e ective
control range of the analog input signal.
Connections
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
LED+
Vin
3021/3023
LED-
LED+
Vin
3021/3023
LED-
Figure 4.
700 mA unit driving 6 High Power LEDs
(VIN > 12VDC)
Figure 5.
700mA unit driving 12 High Power LEDs
(VIN > 24VDC)
©2013 LUXdrive, A Division of LEDdynamics, Inc. www.LUXdrive.com.
Speci cations subject to change without notice. May, 2013 - Rev 3.1
LEDdynamics, Inc.
802.728.4533 P
802.728.3800 F
sales@LUXdrive.com
www.LUXdrive.com
Made
in
the
USA
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