LD48-17-300 MicroPower Direct, LLC, LD48-17-300 Datasheet - Page 2

• Manufacturer Part Number: LD48-17-300
• Description: 0.3a Constant Current 7 - 60 Vdc Input Dc/dc Led Driver
• Manufacturer: MicroPower Direct, LLC

Typical Connection:
Connection Notes:
1. Input fi lter components (C
2. To comply with EN61000-4-5, a TVS should be installed before the input fi lter components. The TVS max clamping
When driving the V
the output current is derived by the formula:
Analog Output Current Control
For simple dimming, a variable resister is connected as shown
above. C
mains interference. Output current is derived by the formula:
When setting the control voltage level at pin 4 (V
a resistor network, output current is derived by the formula:
If The control voltage is derived from V
above may be used. Output current is derived by the formula:
Pin Connections
voltage (@max peak pulse current V
Pin
11
2
3
4
9
ADJ
improves HF noise rejection & helps prevent AC
-LED LED Cathode Conn.
-LED LED Cathode Conn.
V
-V
-V
ADJ
IN
IN
ADJ
pin directly from a DC source,
Function
PWM, On/Off
-DC Supply
-DC Supply
1
, L
2
& L
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MicroPower Direct
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1
IN
) are used to help meet the conducted emissions requirements for the unit.
, the circuits shown
C
) must be 60V.
ADJ
DC Input
) through
14
16
22
23
I
OUT
+LED
+LED
=
+V
+V
I
I
I
0.3
OUT
OUT
OUT
IN
IN
=
=
=
x V
(
0.3
0.3
1 25
LED Anode Conn.
LED Anode Conn.
R
0 3
.
.
ADJ
ADJ
+DC Supply
+DC Supply
x
x
x R
+
(
(
50
R
R
ADJ
1
2
R
R
+
+
2
3
k
R
R
1 25
1 25
2
3
)
.
.
x V
x
2 5
CTRL
. )
)
PWM Output Current Control
Output current may be adjusted by
using a pulse width modulated (PWM)
signal. By varying the signal duty cycle
(as shown at right) the output current
is adjusted up or down. To avoid visible
fl icker, the PWM signal should be
greater than 100 Hz.
For duty cycles (D
0 and 1, the output current is
derived by the formula:
The V
an open collector transistor. The
diode and resistor suppress high
amplitude negative spikes that may
be caused by the drain-source cap-
acitance of the transistor. Negative
spikes on the input of the unit could
cause errors in output current or
erratic operation.
The V
the open drain output of a microcon-
troller. Again, the diode and resistor
suppress high amplitude negative
spikes that may be caused by the
drain-source capacitance of the FET.
Mechanical Dimensions
•
ADJ
ADJ
TEL: [phone]
I
OUT
input may be driven via
input can also be driven by
=
0.3
x D
PWM
www.micropowerdirect.com
Typical Connection:
) between
PWM
•
FAX: [phone]
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
AC Input
•
E-Mail: [e-mail]