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LIGHTLINE
DC/DC-Converter
Typical Characteristics
Standard Application Circuit (no external components required for normal use)
RCD-24
Series
+Vin
GND
(see text)
1
4
RCD-24-xxx
6
1st LED
32.4
24.0
Test conditions: 24V supply, 10m long leads.
Without snubber
Last LED
Analogue
Dim
PWM Dim
On/Off
2
3 5
Snubber circuit optional (needed only for long supply leads or low impedance sources).
Recommended component values = 10μF MLCC + 1R
0
-40
-20
0
With snubber
20 40
Time (μS)
60
80
EMI Filter Suggestions
+Vin
L1
1
CLASS A
6
+LED
+Vin
L1
1
CLASS B
6
+LED
C1
RCD-24-xxx
LED Driver
C1 =
2.2μF
Elect.
Low ESR
C2
C2*
RCD-24-xxx
LED Driver
-Vin
4
5
-LED
-Vin
4
2
3
5
-LED
RCD-24-0.30 - RCD-24-0.70
C1=1μF MLCC
L1 = 22μH
RCD-24-1.00 - RCD-24-1.20
C1=2.2μF MLCC
L1 = 47μH
C3
C4
C5
C6
C7
Recommended Class B PCB Layout for Pinned Version
C8
Vin+
L1
Pin
1
C2*
C2
Top View
C8
LED+
RCD-24-0.30 - RCD-24-0.70 RCD-24-1.00 - RCD-24-1.20
No dimming or PWM dimming: L1 = 220μH
L1 = 47μH C2 = 10nF
C2 = C3 = 10nF MLCC C3 = C5 = 2.2nF
Vin-
C1
C3
C5
C4
C6
C7
LED-
Other caps not required
Analogue Dimming used:
L1 = 120μH
C2 = C7 = 10nF MLCC
Other caps not required
C4 = C6 = C7 = C8 = 100nF
All capacitors MLCC
C2* = optional 2μ2 MLCC only if L1
starts to resonate with the back ripple
current.
www.recom-international.com
REV: 2/2014
L-5
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