LD48 MPD [MicroPower Direct, LLC], LD48 Datasheet - Page 4

• Manufacturer Part Number: LD48
• Description: Compact, Wired Constant Current DC/DC LED Drivers
• Manufacturer: MPD [MicroPower Direct, LLC]

The output current of the unit can also be set by
adjusting the voltage level on the V
value between 0.3V to 1.25V (I
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 (SR
the LED driver at 12 VDC.
The other regulator (SR
input line maintains the control voltage (for the
V
and R
rent level of the LED driver. This level is equal to:
In the second circuit, the 5 VDC regulator (SR
is replaced by the shunt regulator (D
connected in parallel with the resistor network.
The regulator will maintain the voltage across R
and R
limit on the V
circuit will work for inputs between 7VDC and
approximately 36 VDC. For inputs between 36
VDC and 60 VDC, a zener diode (D
added.
When using the analog control input, the nominal
output current is equal to:
The V
Grounding V
ing V
Mechanical Dimensions
ADJ
ADJ
input) at 5 VDC. The resister network of R
ADJ
2
3
can now be used to set the output cur-
at 2.5 VDC, insuring that the 1.25 VDC
to directly to +V
input should be left open if not used.
ADJ
V
ADJ
ADJ
I
NOM
will shut the unit down. Connect-
=
pin will not be exceeded. This
R
=
1
I
R
MAX
+
2
IN
R
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2
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), driven off the same
x
2
may damage the unit.
1
1 25
) keeps the input to
V
X V
.
ADJ
OUT
CTRL
will vary from
ADJ
2
) has been
input to a
1
) circuit
2
1
2
)
Analog Output Current Control
Analog Output Current Control
Pin Connections
Pin
15
12
13
24
1
•
Color
Yellow
Black
White
Blue
Red
TEL: [phone]
+LED
-LED LED Cathode Conn.
+V
-V
Analog Output Current Control
IN
IN
LD48-xx-xxxW
www.micropowerdirect.com
LED Anode Conn.
No Wire
+DC Supply
-DC Supply
•
FAX: [phone]
(7 - 36 VDC IN)
Pin
15
12
13
24
1
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
Color
Yellow
Black
White
Blue
Red
•
+LED
-LED LED Cathode Conn.
E-Mail: [e-mail]
V
+V
-V
ADJ
IN
LD48-xx-xxxWA
IN
LED Anode Conn.
PWM, On/Off
+DC Supply
-DC Supply
(36 - 60 VDC IN)