INNOLINE
DC/DC-Converter
RCD-24
www.recom-international.com I-49
REV:2/2009
EN-60950-1 Certified
UL-60950-1 Pending
Constant
Current
Single
Output
●Constant Current Output LED Driver
●Wide Input Voltage Range
●PWM/Digital Dimming and Analogue
Voltage Dimming
●Short Circuit and Overtemp. Protected
●IP67 rated for /W Version
●96% Efficiency
Features
Regulated
Converters
Selection Guide
Input Voltage (absolute maximum) 36VDC max
Recommended Input Voltage 5V min. / 24V typ. / 36VDC max
Input Filter Capacitor
Output Voltage Range Vin=36V 2V min. / 32V max
Output Current Range Vin - Vout >1.3V 300mA-1200mA
Output Current Accuracy 300mA-1000mA ±2% typ
1200mA ±3% typ
Internal Power Dissipation Worst case load of 5 LEDs 800mW max
Output Current Stability Vin=36V, Vout =1-9 LEDs ±1% max
Output Ripple and Noise (20MHz limited) 300mA-1000mA 120mVp-p max
Vin=36V, Vout =1-9 LEDs 1200mA 200mVp-p max
Temperature Coefficient -40°C~+85°C ambient ±0.015%/°C max
Maximum Capacitive Load 100μF
Operating Frequency <1A 210kHz min/ 260kHz typ/ 300kHz max
1A, 1.2A 350kHz min/ 450kHz typ/ 550kHz max
Efficiency at Full Load 96% max.
Short Circuit Protection Regulated at rated output current
Operating Temperature Range 300mA/350mA -40°C to +85°C
(free air convection) 500mA -40°C to +80°C
600mA -40°C to +75°C
700mA/1000mA -40°C to +71°C
1200mA -40°C to +65°C
Storage Temperature Range -55°C to +125°C
continued on next page
Specifications
( typical at 25°C, nominal input voltage, rated output current unless otherwise specified )
Description
The RCD series is a step-down constant current source designed for driving high power white LEDs. Standard output currents
available are 300mA, 350mA, 500mA, 600mA, 700mA, 1A and 1.2A to make this driver compatible with a wide range of LEDs
from many different manufacturers without the need for any external components. Despite its compact size, the RCD series is
fully featured with very high efficiency, wide input voltage range, high ambient operating temperature and two means of LED
dimming: PWM/digital control and analogue voltage dimming. Both dimming controls are independent and can be combined.
The driver is also designed to be as reliable as the LEDs it is driving, even at the full operating temperature. A wired version is
also available (/W Option) which has been tested to meet IP67.
Derating Graph
(Ambient Temperature)
Output Current (mA)
700
60
20 40 100
300
Ambient Temperature (°C)
080
-20
-40
Natural Convection
350
600
500
71
75
80
85
1000
1200
Part Input Output Output Dimming Mounting
Number Range Current Voltage Control Style
(VDC) (mA) (V)
RCD-24-0.30** 4.5-36V 0-300 2-34 Digital + Analogue PCB or Wired
RCD-24-0.35** 4.5-36V 0-350 2-34 Digital + Analogue PCB or Wired
RCD-24-0.50** 4.5-36V 0-500 2-34 Digital + Analogue PCB or Wired
RCD-24-0.60** 4.5-36V 0-600 2-34 Digital + Analogue PCB or Wired
RCD-24-0.70** 4.5-36V 0-700 2-34 Digital + Analogue PCB or Wired
RCD-24-1.00** 4.5-36V 0-1000 2-34 Digital + Analogue PCB or Wired
RCD-24-1.20** 4.5-36V 0-1200 2-34 Digital + Analogue PCB or Wired
** Add suffix /W for wired version without dimming control (four wires)
** Add suffix /W/X1 for wired version with analogue dimming control (five wires)
** Add suffix /W/X2 for wired version with PWM dimming control (five wires)
** Add suffix /W/X3 for wired version with both analogue and PWM dimming controls (six wires)
I-50 www.recom-electronic.com
REV: 2/2009
RCD-24
Voltage Control (0-15V max)
Output Current
100%
0%
1V 2V 3V 4V 15V
0.13V 4.5V
Analogue Input Voltage
10V
1
0
PWM Digital Control Signal
Output Current (LED appears dim)
50~
200Hz
Typ.
+Vin
Analogue
Dim
0-10VDC
RCD-24-xxx
On/Off
(Optional)
LED DRIVER with 0-10V Interface
GND
3k3
2k4 1st LED
Last LED
0
1
Max*
0
PWM Digital Control Signal
Output Current
* Max output current can also be set using Analogue input
INNOLINE
DC/DC-Converter
RCD-24
Series
Specifications -Continued
Maximum Case Temperature 100°C
Overtemperature Shutdown Internal IC Temperature 150°C typ.
(Auto-restart after cool down) Temperature Hysteresis 20°C typ.
Thermal Impedance Natural Convection 55°C/Watt
Case Material Non Conductive Black Plastic
Potting Material Epoxy (UL94-V0)
Dimensions 22.1 x 12.6 x 8.5mm
Weight 4.5g
Wave Soldering Profile Max. 265°C/10 sec.
PWM Dimming and ON/OFF Control (Leave open if not used)
Remote ON/OFF DC/DC ON 300mA-700mA Open or 0V<Vr<0.6V
Threshold Voltages 1000mA-1200mA Open or 0V<Vr<0.8V
DC/DC OFF (Standby) 300mA-700mA 0.6<Vr<2.9V
1000mA-1200mA 1.4<Vr<2.2V
DC/DC OFF (Shutdown) 300mA-700mA 2.9V<Vr<6V
1000mA-1200mA 2.2V<Vr<15V
Remote Pin Drive Current Vr=5V 1mA max
Quiescent Input Current in Shutdown Mode Vin=36V 200μA max
Maximum PWM Frequency For Linear Operation 20 -200Hz
(measured 10%~90% Dimming) Maximum Frequency 2000Hz
Analogue Dimming Control (leave open if not used)
Input Voltage Range -0.3V - 15V
Control Voltage Range Limits Full On 0.13V ± 50mV
(see Graph) Full Off 4.5V ± 50mV
Analogue Pin Drive Current Vc=5V 0.2mA max.
Environmental
Relative Humidity 5% to 95% RH, non-condensing
/W Versions IP67
Conducted Emissions (all series, see note) EN55022 Class B
Radiated Emissions (all series except 700mA) EN55022 Class B
ESD (all series) EN61000-4-2 Class A
Radiated Immunity (all series) EN61000-4-3 Class A
Fast Transient (all series) EN61000-4-4 Class A
Conducted Immunity (all series) EN61000-4-6 Class A
MTBF (RCD-24-0.70, Nominal Vin, Full Load) +25°C 605 x 10³ hours
using MIL-HDBK 217F +71°C 516 x 10³ hours
Note: Requires an input filter to meet EN55022 ClassB conducted emissions.
Analogue Dimming
Typical Application Circuit
Digital Dimming
Output Current (LED appears bright)
PWM Digital Control Signal
1
050~
200Hz
Typ.
RCD-24
www.recom-international.com I-51
REV:2/2009
INNOLINE
DC/DC-Converter
RCD-24
Series
24VDC
Manual
Dimming
Control
RCD-24-xxx
LED DIMMER for up to 7 white LEDs
GND
1K Pot.
1st LED
Last LED
4k7
More Application Circuit Examples
Typical Characteristics
I-52 www.recom-electronic.com
REV: 2/2009
RCD-24
Recommended PCB Layout
Class B Filter Suggestion
RCD-24-xxx
LED Driver
C1 =
2.5µF
Elect.
-Vin -LED
+LED
45
6
+Vin
L1
1
C2
2
C3
3
C4
C5
C6
C7
C8
C2*
INNOLINE
DC/DC-Converter
RCD-24
Series
RCD-24-0.30 - RCD-24-0.70
No dimming or PWM dimming only:
L1 = 47μH
C2 = C3 = 10nF MLCC
Other caps not required
Analogue Dimming used:
L1 = 120μH
C2 = C7 = 10nF MLCC
Other caps not required
RCD-24-1.00 - RCD-24-1.20
L1 = 220μH
C2 = 10nF MLCC
C3 = C5 = 2.2nF MLCC
C4 = C6 = C7 = C8 = 100nF MLCC
C2* = optional 2μ2 MLCC required
only if L1 starts to resonate with the
back ripple current. Effect depends
on L1 supplier and is not due to
Recom.
L1
C1 C2
C3
C4
C5
C6
C7
C8 LED-
LED+
Vin+
Vin-
Top View
RCD-24
www.recom-international.com I-53
REV:2/2009
INNOLINE
DC/DC-Converter
RCD-24
Series
Bottom View
Top View
6
1
3
2
45
Bottom View
/W Version
6
1
45
7.62
2.54
1.00 ø+0.15/0
0.6
8.50
12.55
4.1
2.54
17.5
22.10
7.6
17.5
Package Style and Pinning
3rd angle
projection
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
Pin Tolerance ± 0.1 mm
Pin Connections RCD-24 Series
Pin # Out Comments
1 +Vin DC Supply
2 Analogue Dimming Leave open if not used
3 PWM/ON/OFF Leave open if not used
4 GND Do not connect to -Vout
5 -Vout LED Cathode Connection
6 +Vout LED Anode Connection
Leave 1 mm space arround case on PCB
Recommended Footprint Details
Wire Connections RCD-24/W Series
Wire # Function Comments
1 (Red) +Vin DC Supply
4 (Black) GND Do not connect to -Vout
5 (Brown) -Vout LED Cathode Connection
6 (Yellow) +Vout LED Anode Connection
Wire length = 100mm + 10mm stripped & tinned = 110mm total
Wire outside diameter = 1.6mm
Wire core diameter = 0.75mm
Wire is UL/CSA listed/ 22AWG / 300V Rated
Wire Connections RCD-24/W/X Series
Wire # Function Comments
2 (Green) Ana Dimming /X1 or /X3
3 (Blue) PWM Dimming /X2 or /X3
Wire length = 100mm + 10mm stripped & tinned = 110mm total
Wire outside diameter = 1.6mm
Wire core diameter = 0.75mm
Wire is UL/CSA listed/ 22AWG / 300V Rated
Bottom View
/W/X1 Version
6
1
45
2
Bottom View
/W/X2 Version
6
1
45
3
Bottom View
/W/X3 Version
6
1
45
3
2
7.6
17.5
7.6
17.5
7.6
17.5