Features
Regulated
Converters
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UL/ RAILWAYS Certified Constant Current
LED Driver
Wide Input and Output Voltage Range
Digital PWM and Analogue Voltage Dimming
Short Circuit and Overtemperature Protected
Pinned or Wired Versions
IP67 rated for /W Version
96% Efficiency
5 year Warranty
LIGHTLINE
DC/DC-Converter
with 5 year Warranty
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, 1000mA and 1200mA to make this
driver compatible with a wide range of LEDs applications. 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 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. Options include an IP67-rated wired version (/W) and a version with built-in reference output vol-
tage (/Vref) to power sensors or for easy analogue dimming.
Constant
Current LED
Driver
Selection Guide
Part
Number
RCD-24-0.30
(a)(b)
RCD-24-0.35
(a)(b)
RCD-24-0.50
(a)(b)
RCD-24-0.60
(a)(b)
Input
Range
(VDC)
4.5-36V
4.5-36V
4.5-36V
4.5-36V
4.5-36V
6-36V
6-36V
Output
Output
Dimming
Current
Voltage
Control
(mA) (Vmin-Vmax)
0-300
2-35
Digital + Analogue
0-350
0-500
0-600
0-700
0-1000
0-1200
2-35
2-35
2-35
2-35
3-31
3-31
Digital + Analogue
Digital + Analogue
Digital + Analogue
Digital + Analogue
Digital + Analogue
Digital + Analogue
Options
Mounting
Style
Pins or Wired
Pins or Wired
Pins or Wired
Pins or Wired
Pins or Wired
Pins or Wired
Pins or Wired
2011/65/EU
6/6
Vref
Vref
Vref
Vref
Vref
RoHS
RCD-24-0.70
(a)(b)
RCD-24-1.00
(b)
RCD-24-1.20
(b)
(a)(b)
(a)
E358085
Standard is no suffix with PCB Pins.
Add suffix /Vref for pinned version with Vref output and analogue dimming
(b)
Add suffix /W for wired version without dimming control (four wires)
(b)
Add suffix /W/X1 for wired version with analogue dimming control (five wires)
(b)
Add suffix /W/X2 for wired version with PWM dimming control (five wires)
(b)
Add suffix /W/X3 for wired version with both analogue and PWM dimming controls (six wires)
(a)
Add suffix /W/Vref for wired version with Vref output and analogue dimming (six wires)
EN-50121-3-2 Certified
EN-60950-1 Certified
UL-60950-1 Certified
RCD-24
Derating Graph
(Ambient Temperature)
1200
1100
1000
900
800
700
600
500
75
80
65
71
Natural Convection
Specifications
(typical at 25°C, nominal input voltage, rated output current unless otherwise specified )
Input Voltage (absolute maximum)
Recommended Input Voltage
Input Filter
Output Current Accuracy
(Vin = 24DC)
Internal Power Dissipation
Output Current Stability
Output Ripple and Noise (20MHz BW)
Vin=36V, Vout =1-9 LEDs
Temperature Coefficient
Maximum Capacitive Load
Operating Frequency
Efficiency at Full Load
Short Circuit Protection
300mA-700mA
1000mA-1200mA
300mA-700mA
1000mA-1200mA
Worst case load of 5 LEDs
Vin=36V, Vout =1-9 LEDs
300mA-700mA
1000mA-1200mA
-40°C to +85°C ambient
300mA-700mA
1000mA-1200mA
40VDC max
5V min. / 24V typ. / 36VDC max
6V min. / 24V typ. / 36VDC max
Capacitor
±1% typ, ±3% max.
±2% typ, ±5% max.
800mW max
±1% max
150mVp-p max
300mVp-p max
±0.015%/°C max
100μF
210kHz min/ 250kHz typ/ 280kHz max
350kHz min/ 450kHz typ/ 550kHz max
96% max.
Regulated at rated output current
continued on next page
Output Current (mA)
85
350
300
-40 -20 0 20 40 60 80 100
Ambient Temperature (°C)
Refer to Application Notes
L-3
www.recom-international.com
REV: 3/2014
LIGHTLINE
DC/DC-Converter
Specifications
(typical at 25°C, nominal input voltage, rated output current unless otherwise specified )
-40°C to +85°C
-40°C to +80°C
-40°C to +75°C
-40°C to +71°C
-40°C to +65°C
Storage Temperature Range
-55°C to +125°C
Overtemperature Shutdown
Internal IC Temperature
150°C typ.
(Auto-restart after cool down)
Temperature Hysteresis
20°C typ.
Maximum Case Temperature
100°C
Thermal Impedance
Natural Convection
55°C/Watt
Case Material (Pinned or Wired Versions)
Non Conductive Black Plastic
Potting Material (Pinned or Wired Versions)
Epoxy (UL94-V0)
Dimensions
Pinned/Wired
22.1 x 12.6 x 8.5mm
Weight
Pinned/Wired
4.5g/6.8g
Soldering Profile
Pinned
265°C/10 sec. max
Packing Quantities
Pinned Versions
39pcs per Tube
(Refer to App Notes for Tube sizes)
Wired Versions
5pcs per Bag
PWM Dimming and ON/OFF Control (Leave open if not used - do not tie to +Vin)
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
200Hz max.
Frequency Limit
1000Hz max.
Analogue Dimming Control (leave open if not used - do not tie to +Vin)
Input Voltage Limits
Standard
-0.3V - 15V
Vref Version
-0.3V - 5V
Control Voltage Range
Full On
0.13V ± 50mV
(see Graphs)
300, 700, 1200mA: Full Off
4.2V ± 150mV
1000mA: Full Off
4.35V ± 100mV
Vref Version: Full Off
2.6V ± 100mV
Analogue Pin Drive Current
Vc=5V
0.2mA max.
Vref Version
Vref Voltage
3.3V± 70mV
Vref Output Current
5mA
Vref Output Short Circuit Current
18mA typ.
Environmental
Relative Humidity
5% to 95% RH, non-condensing
/W Versions
IP67
Shock / Vibration
EN61373
EMC Railways
EN50121-3-2:2006
Conducted Emissions
(with filter, see note)
EN55022
Class B
Radiated Emissions
(all series except >700mA) EN55022
Class B
ESD
EN61000-4-2
Class A
Radiated Immunity
EN61000-4-3
Class A
Fast Transient
EN61000-4-4
Class A
Conducted Immunity
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:
1. Requires an input filter to meet EN55022 Class B conducted emissions - see next page
2. 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.
L-4
REV: 3/2014
Operating Temperature Range
(free air convection)
300mA-350mA
500mA
600mA
700mA-1000mA
1200mA
RCD-24
Series
Digital Dimming
PWM Digital Control Signal
1
0
200Hz
Typ.
Output Current (LED appears dim)
PWM Digital Control Signal
1
0
200Hz
Typ.
Output Current (LED appears bright)
Analogue Dimming
Standard Version:
100%
Analogue Input Voltage
Output Current
1000mA
RCD-24
0%
300, 700, 1200mA
0.13V
1V
2V
3V
4V
4.35V
10V 15V
Voltage Control (0-15V max)
4.2V
Vref Version:
100%
Vref Version Analogue Input Voltage
Output Current
0%
0.13V
1V
2V
2.6V
3V
4V
5V
Voltage Control (0-5V max)
Combined PWM and Analogue Dimming
PWM Digital Control Signal
1
0
Output Current
Max*
0
* Max output current can also be set using Analogue input
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LIGHTLINE
DC/DC-Converter
Typical Characteristics
RCD-24
Series
Standard Application Circuit (no external components required for normal use)
+Vin
(see text)
GND
Analogue
Dim
PWM Dim
On/Off
4
2
3
5
1
6
Voltage Across Converter Input Pins
RCD-24-xxx
Test conditions: 24V supply, 10m long leads.
32.4
24.0
1st LED
Last LED
Without snubber
With snubber
0
-40
Snubber circuit optional (needed only for long supply leads or low impedance sources).
Recommended component values = 10µF MLCC + 1R
-20
0
40
20
Time (µS)
60
80
EMI Filter Suggestions
RCD-24
+Vin
L1
1
CLASS A
6
+LED
+Vin
C1 =
2.2µF
Elect.
Low ESR
L1
1
C2*
CLASS B
6
+LED
C1
RCD-24-xxx
LED Driver
4
5
-LED
C2
RCD-24-xxx
LED Driver
4
2
3
5
-LED
-Vin
-Vin
C3
C4
C5
C6
C7
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
Recommended Class B PCB Layout for Pinned Version
C2*
Vin+
C1
Vin-
L1
C3
C5
Pin
1
C8
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 = 47μH
C2 = C3 = 10nF MLCC
Other caps not required
Analogue Dimming used:
L1 = 120μH
C2 = C7 = 10nF MLCC
Other caps not required
L1 = 220μH
C2 = 10nF
C3 = C5 = 2.2nF
C4 = C6 = C7 = C8 = 100nF
All capacitors MLCC
C2* = optional 2μ2 MLCC only if L1
starts to resonate with the back ripple
current.
C2
C4
C6
C7
LED-
www.recom-international.com
REV: 3/2014
L-5
LIGHTLINE
DC/DC-Converter
Application Examples
LED DRIVER with 0-10V Interface
+Vin
GND
Analogue
Dim
0-10VDC
On/Off
(Optional)
2k7
3k3
RCD-24-xxx
RCD-24
Series
LED DIMMER for up to 10 white LEDs
+Vin
RCD-24-xxx/Vref
Manual
Dimming
Control
Dim
10K
Vref
1st LED
Last LED
GND
1st LED
Last LED
MULTIPLE LED DRIVER (up to 20 LEDS)
+Vin
GND
Analogue
Dim
PWM
Dim/
On/Off
2x NPN
0.5~1.0 Ohm
RCD-24-0.70
LED DIMMER with high frequency PWM control
1st LED
Last LED
10kHz
TTL
PWM
R
+Vin
GND
C
Ana.
Dimming
RCD-24-xxx
1st LED
Last LED
Driving Two Strings of 350mA LEDs with one 700mA Driver using a current mirror
Note:
It is not possible to parallel the drivers to increase the current.
LED Temperature Monitoring
RGB Driver
RCD-24
Automatic LED Overtemperature Protection
+Vin
R*
Vref
Analog
Dimming
PTC
Thermistor
GND
Thermally connected
*Typically, choose R so that R=R
ptc
@ 85°C and R>660 Ohm.
RCD-24-xxx/Vref
1st LED
Last LED
Typical Response Curve (PTC = 500 Ohm @ 70°C)
100%
Output Current
0%
25
50
70
60
LED Temperature (°C)
80
90
L-6
REV: 3/2014
www.recom-power.com
LIGHTLINE
DC/DC-Converter
Package Style and Pinning
Pinned Version
RCD-24
Series
22.10
8.50
4.1
0.6
17.78
12.55
Pin Connections
Pin #
1
Out
+Vin
Analogue Dimming
PWM/ON/OFF
Vref
GND
-Vout
+Vout
RCD-24 Series
Comments
DC Supply
Leave open if not used
Leave open if not used
Vref Version only)
Do not connect to -Vout
LED Cathode Connection
LED Anode Connection
7.62
1.00 ø+0.15/0
2
3
(3
4
5
4
3
Bottom View
2
6
1
5
6
2.46
2.30
2.54
Top View
2.54
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
Pin Tolerance ± 0.1 mm
Leave >1mm space arround case on PCB
for air circulation
Recommended Footprint Details
7
10
Tc
Top View
RCD-24
Wired Versions
17.5
Bottom View
/W Version
Wire Connections
RCD-24/W Series
Comments
DC Supply
Do not connect to -Vout
LED Cathode Connection
LED Anode Connection
4
1
5
7.6
6
Wire #
1 (Red)
4 (Black)
5 (Brown)
6 (Yellow)
Function
+Vin
GND
-Vout
+Vout
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
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REV: 3/2014
L-7
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