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LD24-20-700W(A) 数据表(PDF) 4 Page - MicroPower Direct, LLC

部件名 LD24-20-700W(A)
功能描述  Constant Current Output
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制造商  MPD [MicroPower Direct, LLC]
网页  http://www.micropowerdirect.com
标志 MPD - MicroPower Direct, LLC

LD24-20-700W(A) 数据表(HTML) 4 Page - 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
LD24-xx-xxxW
Pin
Color
LD24-xx-xxxWA
1
Black
-VIN
-DC Supply
1
Black
-VIN
-DC Supply
2
White
No Wire
2
White
VADJ
PWM, On/Off
8
Blue
-LED LED Cathode Conn.
8
Blue
-LED LED Cathode Conn.
9
Yellow
+LED
LED Anode Conn.
9
Yellow
+LED
LED Anode Conn.
16
Red
+VIN
+DC Supply
16
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 con-
nected 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 30 VDC.
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 - 30 VDC IN)


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