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LD48 Datasheet(PDF) 4 Page - MicroPower Direct, LLC

Part # LD48
Description  Compact, Wired Constant Current DC/DC LED Drivers
PDF  4 Pages
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Manufacturer  MPD [MicroPower Direct, LLC]
Direct Link  http://www.micropowerdirect.com
Logo MPD - MicroPower Direct, LLC

LD48 Datasheet(HTML) 4 Page - MicroPower Direct, LLC

  LD48 Datasheet HTML 1Page - MicroPower Direct, LLC LD48 Datasheet HTML 2Page - MicroPower Direct, LLC LD48 Datasheet HTML 3Page - MicroPower Direct, LLC LD48 Datasheet HTML 4Page - MicroPower Direct, LLC  
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MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
www.micropowerdirect.com
Notes:
• All dimensions are typical in inches (mm)
• Tolerance x.xx = ±0.02 (±0.50)
• Pin 1 is marked by a “dot” or indentation on the top of the unit
Pin Connections
Pin
Color
LD48-xx-xxxW
Pin
Color
LD48-xx-xxxWA
1
Black
-VIN
-DC Supply
1
Black
-VIN
-DC Supply
15
White
No Wire
15
White
VADJ
PWM, On/Off
12
Blue
-LED LED Cathode Conn.
12
Blue
-LED LED Cathode Conn.
13
Yellow
+LED
LED Anode Conn.
13
Yellow
+LED
LED Anode Conn.
24
Red
+VIN
+DC Supply
24
Red
+VIN
+DC Supply
Mechanical Dimensions
Analog Output Current Control
The output current of the unit can also be set by
adjusting the voltage level on the VADJ input to a
value between 0.3V to 1.25V (IOUT will vary from
25% to 100% of rated output current). Care must
be taken not to exceed 1.25V on this input, or
the driver may be damaged.
A simple analog circuit using two low cost,
switching regulators is shown at left. Work-
ing from inputs that can range from 15 to 32
VDC,the top regulator (SR1) keeps the input to
the LED driver at 12 VDC.
The other regulator (SR2), driven off the same
input line maintains the control voltage (for the
VADJ input) at 5 VDC. The resister network of R1
and R2 can now be used to set the output cur-
rent level of the LED driver. This level is equal to:
V
RR
R
XV
12
2
ADJ
CTRL
=
+
In the second circuit, the 5 VDC regulator (SR2)
is replaced by the shunt regulator (D1) circuit
connected in parallel with the resistor network.
The regulator will maintain the voltage across R2
and R3 at 2.5 VDC, insuring that the 1.25 VDC
limit on the VADJ pin will not be exceeded. This
circuit will work for inputs between 7VDC and
approximately 36 VDC. For inputs between 36
VDC and 60 VDC, a zener diode (D2) has been
added.
When using the analog control input, the nominal
output current is equal to:
.
II
x
V
125
NOM
MAX
ADJ
=
The VADJ input should be left open if not used.
Grounding VADJ will shut the unit down. Connect-
ing VADJ to directly to +VIN may damage the unit.
Analog Output Current Control (7 - 36 VDC IN)
Analog Output Current Control (36 - 60 VDC IN)



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