1200
300
1000
Ambient Temperature Range (°C)
Output Current (mA)
-40 0 20 40 50 80 100
350
500
700
80
50
75
Natural Convection
60
60
RCD-48
RCD-48
LIGHTLINE
DC/DC-Converter
with 5 year Warranty
Constant
Current
Buck LED
Driver
Selection Guide
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 +Vin)
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.
Analogue Pin Drive Current Vc=5V 0.2mA max.
Vref Version Vref Voltage 5V -5%/+10%
Vref Output Current 0.15mA max.
Vref Output Short Circuit Current 2mA typ.
Ambient Temperature 350mA -40°C to +80°C
(free air convection) 500mA -40°C to +80°C
700mA -40°C to +75°C
1000mA -40°C to +60°C
1200mA -40°C to +50°C
Analogue and PWM Dimming Control Note: Leave open if not used - do not tie to +Vin continued on next page
Specifications (typical at 25°C, nominal input voltage, rated output current unless otherwise specified)
Description
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).
●70W Buck LED Driver
●Constant Current Output (350 to 1200mA)
●Digital PWM and Analogue Voltage Dimming
●High Efficiency to 96%
●EN, UL and RAILWAYS Certified
●Metal or Plastic Case Version
●IP67 Rated for /W, Plastic Case Version
Features
LED DRIVER
Part Input Output Output Dimming Efficiency
Number Range Current Voltage Control Typ.
(VDC) (mA) (VDC) (%)
RCD-48-0.35* 9-60 0-350 2-56 Digital + Analogue 96
RCD-48-0.50* 9-60 0-500 2-56 Digital + Analogue 96
RCD-48-0.70* 9-60 0-700 2-56 Digital + Analogue 96
RCD-48-1.00* 9-60 0-1000 2-56 Digital + Analogue 96
RCD-48-1.20/M 9-60 0-1200 2-56 Digital + Analogue 96
*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.
EN-50121-3-2 Certified
EN-60950-1 Certified
UL-60950-1 Certified
E224736
RoHS
2011/65/EU
6/6
Refer to Application Notes
Derating-Graph
(Ambient Temperature)
L-12 www.recom-power.comREV: 1/2016
0.60
27.94
0.50
11.10
16.65
4.10
Bottom View
5
4
3
2
1
6
7
4x2.54 10.16
2.54
2.54
1.00+0.15/-0
32.60
10.16
Top View
5
15 Tc
RCD-48
RCD-48
Series
Specifications (typical at 25°C, nominal input voltage, rated output current unless otherwise specified
Package Style and Pinning
Unit: mm
Tolerance:
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
Pin Connections RCD-48-x.xx
Pin# Function Comments
1 +Vin DC Supply
2 GND Do not connect to -Vout
3 Vref Vref Voltage 4.8-5.5V typ.
4 PWM/ON/OFF Leave open if not used
5 Analogue Dimming Leave open if not used
6 -Vout LED Cathode Connection
7 +Vout LED Anode Connection
Storage Temperature -55°C to +125°C
Case Thermal Impedance 10°C/W typ.
Soldering Temperature 265°C / 10sec. max.
Relative Humidity 95% RH
Input Filter Capacitor only
Short Circuit Protection Continuous, Auto Recovery
Case Material Non Conductive Black Plastic
Metal Case
Potting Material Silicone Potting Material (UL94V-0)
Case Dimensions Plastic Case 32.6 x 16.65 x 11.10 mm
Metal Case 32.6 x 16.0 x 11.2 mm
Package Weight Pinned (Plastic Case) 13g
Wired (Plastic Case) 16g
Pinned (Metal Case) 16g
Packing Quantity Pinned (Plastic/Metal Case) 29 pcs.
Wired (Plastic Case) 12 pcs.
MTBF (using MIL-HDBK217F) +25°C 1700 x 10³ hours
(Nominal Vin at Full Load) Note: Detailed Information see Application Notes chapter “MTBF“
Safety Shock / Vibration EN61373
EMC RAILWAYS EN50121-3-2:2006
Conducted EN55011
Radiated EN55011
ESD EN61000-4-2
Radiated Immunity EN61000-4-3
Fast Transient EN61000-4-4
Surge EN61000-4-5
Conducted Immunity EN61000-4-6
Through Hole Case (Plastic)
LIGHTLINE
DC/DC-Converter
Available Operating Area
60
40
20
10
30
50
70
10 20 30 40 50 60 70
Output Voltage (V)
Input Voltage (V)
Safe Operating Area
Through Hole Case (Metal)
0.60
27.94
0.60
11.20
16.00
4.10
Bottom View
5
4
3
2
1
6
7
4x2.54 10.16
2.54
2.54
1.00+0.15/-0
32.60
10.16
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.
www.recom-power.com L-13REV: 1/2016
RCD-48
RCD-48
Series
LIGHTLINE
DC/DC-Converter
Package Style and Pinning
EMI Filter Suggestions
Wire Connections RCD-48-x.xx/W
Pin# Function Wire color
1 +Vin Red
2 GND Black
3 Vref Yellow
4 PWM/ON/OFF Blue
5 Analogue Dimming Green
6 LED- Brown
7 LED+ Yellow
Wires: UL/CSA approved (22AWG/300V)
Wired Version (Plastic)
(Yellow) 7
(Brown) 6
2 (Black)
1 (Red)
3
4
5
27.94
32.60
Bottom View 10.16
16.56
11.10 93.0 3 10.0
1.60
0.75
Unit: mm
Tolerance:
XX.X ± 1.0 mm
XX.XX ± 0.25 mm
RCD-48
Class B
DC
IN C1 C2 C3
C6
C5
C7
C8
C9 LOAD
1
2PWM
4
Analog
56
7
C4
Vref
3
Vin
LED+
LED-
+
-
Top Layer
L1
C1
C4
C5
LED+
LED-
C9
C3
Bottom Layer
C2 C7
C8
5
4
3
2
1
6
7
Filter Suggestion
L1 1mH (e.g. WE744272102)
C1 10μF
C2 1μF
C3 100nF close to Pins
C4 - C9 10nF
L-14 www.recom-power.comREV: 1/2016
RCD-48
AC/DC
Constant
Voltage
RCD-48-0.35
+
_
96% Efficiency
RCD-48-0.50 RCD-48-0.70/W
+
_Vref
An.
Pot.
+
_
+
_ LED1 LED2 LED1 ---- LED15
LED
ARRAY
48VDC Bus
96% Efficiency
96% Efficiency
95% Efficiency
Standard Application
Single String Application PWM Dimming Controlled
0
1.0
2.0
3.0
4.0
5.0
050
100
ON
Analog Voltage
Output Current (%)
Analog Voltage (V)
Lighting/Backlighting Wall Application
High Efficiency Lighting
Dimming Controlled by Analog Voltage
RCD-48-x.xx
Last
LED
First
LED
Vin
GND
Analogue
PWM ON/OFF LED-
LED+
Vref
RCD-48-x.xx
Last
LED
First
LED
Vin
GND
Analogue
Vref
LED-
LED+
I2I1
LED1 LED2
PWM ON/OFF
LIGHTLINE
DC/DC-Converter
RCD-48
Series
Note:
It is not possible to parallel the drivers to increase the current.
www.recom-power.com L-15REV: 1/2016
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.