The RCD-48 series is a step-down constant current source designed for driving high power LED applications.
Four output currents are available. The maximum output voltage is 56V. The buck drivers have digital PWM
and/or analogue voltage dimming control and are special featured with very high efficiency. Typical applications
are 48V bus lighting solutions or high voltage LED arrays (e.g. high bay lights).
Selection Guide
Part
Number
RCD-48-0.35*
RCD-48-0.50*
RCD-48-0.70*
RCD-48-1.00*
RCD-48-1.20/M
Input
Range
(VDC)
9-60
9-60
9-60
9-60
9-60
Output
Current
(mA)
0-350
0-500
0-700
0-1000
0-1200
Output
Voltage
(VDC)
2-56
2-56
2-56
2-56
2-56
Dimming
Control
Digital + Analogue
Digital + Analogue
Digital + Analogue
Digital + Analogue
Digital + Analogue
Efficiency
Typ.
(%)
96
96
96
96
96
Constant
Current
Buck LED
Driver
*add suffix “/W“ for wired version with Vref output and analogue + PWM dimming control (seven wires)
Note: Add suffix “/M“ for metal case (RCD-48-1.20/M only). No metal case with wires available.
Standard version (no suffix) and wired version (suffix /W) only in plastic case.
Specifications
(typical at 25°C, nominal input voltage, rated output current unless otherwise specified
)
Operating Input Voltage Range
9-60VDC
Absolute Maximum Input Voltage
65VDC max.
Output LED String Voltage Range
2V min. / 56V max.
(depand on the input voltage, defined by the output impedance, see Safe Operating Area)
Input Filter
Capacitor
Output Current Accuracy
±3% typ. / ±5% max.
Internal Power Dissipation
350mA
0.8W typ.
(Vin=60V, Vout=56V)
500mA
1.0W typ.
700mA
1.1W typ.
1000mA
1.3W typ.
1200mA
1.4W typ.
Output Current Stability
Vin=60V, Vout=2-56V, Iout=350-1200mA
±1% max.
Output Ripple and Noise (20MHz BW) Vin=60V, Vout=2-56V, Iout=350-1200mA
300mVp-p max.
Maximum Capacitive Load
100μF max.
Switching Frequency
50kHz min. / 1000kHz max.
Efficiency at Full Load
96% typ.
PWM DIMMING CONTROL & REMOTE ON/OFF CONTROL
Input Voltage Range
5V typ. / 10V max.
Threshold Voltage
Device ON
0.5V max.
Device OFF
2.0V min.
PWM Frequency
For Linear Operation
200Hz max.
Frequency Limit
1000Hz max.
ANALOGUE DIMMING CONTROL (Leave open if not used - do not tie to +V
in
)
Input Voltage Range
0V min. / 10V max.
Control Voltage Range
0V min. / 5.1V max.
Note: The analogue dimming range is from 0% to 100%, but the output can be unstable below 10%, when using the analo-
gue dimming function.
2011/65/EU
6/6
RoHS
E224736
EN-50121-3-2 Certified
EN-60950-1 Certified
UL-60950-1 Certified
RCD-48
RCD-48
Derating-Graph
(Ambient Temperature)
1200
Output Current (mA)
1000
700
500
350
300
-40
0
20
40
50 60 80
100
Natural Convection
50
60
75
80
Analogue Pin Drive Current
Vref Version
Ambient Temperature
(free air convection)
Vc=5V
Vref Voltage
Vref Output Current
Vref Output Short Circuit Current
350mA
500mA
700mA
1000mA
1200mA
Analogue and PWM Dimming Control Note: Leave open if not used - do not tie to +Vin
0.2mA max.
5V -5%/+10%
0.15mA max.
2mA typ.
-40°C to +80°C
-40°C to +80°C
-40°C to +75°C
-40°C to +60°C
-40°C to +50°C
continued on next page
Ambient Temperature Range (°C)
Refer to Application Notes
www.recom-power.com
L-12
REV: 1/2016
LIGHTLINE
DC/DC-Converter
Specifications
(typical at 25°C, nominal input voltage, rated output current unless otherwise specified
Storage Temperature
Case Thermal Impedance
Soldering Temperature
Relative Humidity
Input Filter
Short Circuit Protection
Case Material
Potting Material
Case Dimensions
Package Weight
-55°C to +125°C
10°C/W typ.
265°C / 10sec. max.
95% RH
Capacitor only
Continuous, Auto Recovery
Non Conductive Black Plastic
Metal Case
Silicone Potting Material (UL94V-0)
Plastic Case
32.6 x 16.65 x 11.10 mm
Metal Case
32.6 x 16.0 x 11.2 mm
Pinned (Plastic Case)
13g
Wired (Plastic Case)
16g
Pinned (Metal Case)
16g
Pinned (Plastic/Metal Case)
29 pcs.
Wired (Plastic Case)
12 pcs.
+25°C
1700 x 10³ hours
Note: Detailed Information see Application Notes chapter “MTBF“
RCD-48
Series
Safe Operating Area
70
60
Input Voltage (V)
50
40
30
20
10
10
20
30
40
50
60
70
Available Operating Area
Packing Quantity
MTBF (using MIL-HDBK217F)
(Nominal Vin at Full Load)
Safety
Output Voltage (V)
Shock / Vibration
EMC RAILWAYS
Conducted
Radiated
ESD
Radiated Immunity
Fast Transient
Surge
Conducted Immunity
EN61373
EN50121-3-2:2006
EN55011
EN55011
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
Note:
All LED Drivers may not be used without a load.
They must be switched on the primary side only.
Noncompliance may damage the LED or reduce
its lifetime.
Package Style and Pinning
RCD-48
Through Hole Case (Plastic)
32.60
11.10
0.50
0.60
10.16
27.94
1.00+0.15/-0
1
2
3
4
5
7
4.10
16.65
5
15
Tc
Top View
Pin Connections
Pin#
1
10.16
6
2.54
2.54
RCD-48-x.xx
Comments
DC Supply
Do not connect to -Vout
Vref Voltage 4.8-5.5V typ.
Leave open if not used
Function
+Vin
GND
Vref
PWM/ON/OFF
4x2.54
Bottom View
2
3
4
5
6
Through Hole Case (Metal)
32.60
11.20
0.60
0.60
10.16
27.94
1.00+0.15/-0
1
2
3
4
5
7
4.10
16.00
Analogue Dimming Leave open if not used
-Vout
+Vout
LED Cathode Connection
LED Anode Connection
7
Unit: mm
Tolerance:
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
4x2.54
Bottom View
6
10.16
2.54
2.54
www.recom-power.com
REV: 1/2016
L-13
LIGHTLINE
DC/DC-Converter
Package Style and Pinning
RCD-48
Series
11.10
93.0 3
10.0
Wired Version (Plastic)
27.94
32.60
1 (Red)
2 (Black)
3
4
5
(Brown) 6
0.75
Bottom View
10.16
16.56
(Yellow) 7
Wire Connections
Pin#
Function
1
2
3
4
5
6
7
+Vin
GND
Vref
PWM/ON/OFF
RCD-48-x.xx/W
Wire color
Red
Black
Yellow
Blue
Analogue Dimming Green
LED-
LED+
Brown
Yellow
Unit: mm
Tolerance:
XX.X ± 1.0 mm
XX.XX ± 0.25 mm
1.60
Wires: UL/CSA approved (22AWG/300V)
EMI Filter Suggestions
Class B
1
DC
IN
RCD-48
Vref
3
4
5
7
L1
1mH (e.g. WE744272102)
10μF
1μF
100nF close to Pins
10nF
C1
C2
C3
2
PWM Analog
6
C9
LOAD
C1
C2
C3
C4 - C9
RCD-48
C6
C4
C5
C7
C8
Filter Suggestion
Top Layer
Bottom Layer
6
C1
+
C2
5
4
3
LED-
C5
C4
C3
Vin
-
L1
2
1
7
C7
C9
C8
LED-
LED+
LED+
L-14
REV: 1/2016
www.recom-power.com
LIGHTLINE
DC/DC-Converter
Standard Application
RCD-48
Series
PWM Dimming Controlled
LED+
Single String Application
Vin
RCD-48-x.xx
GND
Vref
Analogue
PWM ON/OFF
H
First
LED
OFF
ON
ON
200Hz
OFF
ON
OFF
PWM
L
Max
Io
0
Last
LED
LED-
Dimming Controlled by Analog Voltage
5.0
4.0
Analog Voltage (V)
Lighting/Backlighting Wall Application
LED+ LED1 LED2
RCD-48-x.xx
ON
Ana
Vin
log
Volt
a
ge
3.0
2.0
1.0
0
First
LED
GND
Vref
Last
LED
I1
I2
RCD-48
0
50
Output Current (%)
100
Analogue
PWM ON/OFF
LED-
High Efficiency Lighting
95% Efficiency
+
_
AC/DC
Constant
Voltage
RCD-48-0.35
+
_
LED1 LED2
RCD-48-0.50
+
_
LED1 ---- LED15
Pot.
RCD-48-0.70/W
+
_
An. Vref
LED
ARRAY
48VDC Bus
96% Efficiency
96% Efficiency
96% Efficiency
Note:
It is not possible to parallel the drivers to increase the current.
The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit
written consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer
shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications.
