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REV:1/2011
RCD-24
EN-60950-1 Certified
UL-60950-1 Certified
(Vref Version Pending)
Constant
Current LED
Driver
●UL Certified Constant Current LED Driver
●Wide Input and Output Voltage Range
●Digital PWM and Analogue Voltage Dimming
●Short Circuit and Overtemperature Protected
●Pin, Wire or Open Frame SMD Versions
●IP67 rated for /W Version
●96% Efficiency
●5 year Warranty
Features
Regulated
Converters
Selection Guide
Input Voltage (absolute maximum) 40VDC max
Recommended Input Voltage 300mA-700mA 5V min. / 24V typ. / 36VDC max
1000mA-1200mA 6V min. / 24V typ. / 36VDC max
Input Filter Capacitor
Output Current Accuracy 300mA-700mA ±1% typ, ±3% max.
(Vin = 24DC) 1000mA-1200mA ±2% typ, ±5% max.
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 BW) 300mA-700mA 150mVp-p max
Vin=36V, Vout =1-9 LEDs 1000mA-1200mA 300mVp-p max
Temperature Coefficient -40°C~+85°C ambient ±0.015%/°C max
Maximum Capacitive Load 100μF
Operating Frequency 300mA-700mA 210kHz min/ 250kHz typ/ 280kHz max
1000mA-1200mA 350kHz min/ 450kHz typ/ 550kHz max
Efficiency at Full Load 96% max.
Short Circuit Protection Regulated at rated output current
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, 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), an open frame version with SMD pins (/SMD/OF)
and a version with built-in reference output voltage (/Vref) to power sensors or for easy analogue dimming.
Part Input Output Output Dimming Options Mounting
Number Range Current Voltage Control Style
(VDC) (mA) (Vmin-Vmax)
RCD-24-0.30(a)(b) 4.5-36V 0-300 2-35 Digital + Analogue Vref Pins, SMD or Wired
RCD-24-0.35(a)(b) 4.5-36V 0-350 2-35 Digital + Analogue Vref Pins, SMD or Wired
RCD-24-0.50(a)(b) 4.5-36V 0-500 2-35 Digital + Analogue Vref Pins, SMD or Wired
RCD-24-0.60(a)(b) 4.5-36V 0-600 2-35 Digital + Analogue Vref Pins, SMD or Wired
RCD-24-0.70(a)(b) 4.5-36V 0-700 2-35 Digital + Analogue Vref Pins, SMD or Wired
RCD-24-1.00(b) 6-36V 0-1000 3-33 Digital + Analogue Pins or Wired
RCD-24-1.20(b) 6-36V 0-1200 3-33 Digital + Analogue Pins or Wired
(a)(b) Standard is no suffix with PCB Pins.
(a) Add suffix /Vref for pinned or SMD versions with Vref output and analogue dimming
(a) Add suffix /SMD/OF for open frame version with SMD solderpins (/SMD/OF-R for Tape and Reel Packaging)
(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)
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
800
900
1100
65
Refer to Application Notes
RoHS
2002/95/EC
6/6 E224736
LIGHTLINE
DC/DC-Converter
with 5 year Warranty
RCD-24
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REV: 1/2011
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.
LIGHTLINE
DC/DC-Converter
RCD-24
Series
Specifications -Continued
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
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
SMD 21.0 x 11.4 x 10mm
Weight Pinned/Wired 4.5g/6.8g
SMD 1.9g
Soldering Profile Pinned 265°C/10 sec. max
SMD 245°C/30 sec. max
Packing Quantities Pinned Versions 39pcs per Tube
(Refer to App Notes for Tube sizes) SMD Versions 21pcs per Tube
SMD Tape and Reel 500pcs per Reel
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 ±1% Linear Operation 200Hz max.
Frequency Limit 2000Hz 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) Standard: Full Off 4.5V ± 50mV
Vref Version: Full Off 3.3V ± 50mV
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
Conducted Emissions (with filter, 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 Class B conducted emissions - see next page
Analogue Dimming
Digital Dimming
Output Current (LED appears bright)
PWM Digital Control Signal
1
050~
200Hz
Typ.
Combined PWM and Analogue Dimming
0
1
Max*
0
PWM Digital Control Signal
Output Current
* Max output current can also be set using Analogue input
Voltage Control (0-5V max)
Output Current
100%
0%
1V 2V 3V 4V 5V
0.13V 3.3V
Vref Version Analogue Input Voltage
Standard Version:
Vref Version:
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REV:1/2011
RCD-24
LIGHTLINE
DC/DC-Converter
RCD-24
Series
Recommended Class B PCB Layout
for Pinned / SMD Versions
EMI Filter Suggestions
RCD-24-xxx
LED Driver
C1 =
2.2µF
Elect.
Low ESR
-Vin -LED
+LED
45
6
+Vin
L1
1
C2
2
C3
3
C4
C5
C6
C7
C8
C2*
RCD-24-0.30 - RCD-24-0.70
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
Top View
Typical Characteristics
CLASS B
RCD-24-1.00 - RCD-24-1.20
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.
RCD-24-xxx
LED Driver
C1
-Vin -LED
+LED
45
6
+Vin
L1
1
RCD-24-0.30 - RCD-24-0.70 RCD-24-1.00 - RCD-24-1.20
C1=1μF MLCC C1=2.2μF MLCC
L1 = 22μH L1 = 47μH
CLASS A
Standard Application Circuit (no external components required for normal use)
+Vin
Analogue
Dim
RCD-24-xxx
PWM Dim
On/Off
Snubber circuit optional (needed only for long supply leads or low impedance sources).
Recommended component values = 10µF MLCC + 1R
GND
1st LED
Last LED
(see text)
1
2
3
4
6
5
Voltage Across Converter Input Pins
0
20
0
Time (µS)
24.0
40
-20 60 80
-40
Test conditions: 24V supply, 10m long leads.
Without snubber
With snubber
32.4
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REV:1/2011
LIGHTLINE
DC/DC-Converter
RCD-24
Series
RCD-24
+Vin
Manual
Dimming
Control
RCD-24-xxx/Vref
LED DIMMER for up to 10 white LEDs
GND
10K
1st LED
Last LED
VrefDim
Application Examples
+Vin
Analogue
Dim
RCD-24-0.70
PWM
Dim/
On/Off
Driving Two Strings of 350mA LEDs with one 700mA Driver using a current mirror
MULTIPLE LED DRIVER (up to 20 LEDS)
GND
0.5~1.0 Ohm
1st LED
Last LED
2x NPN
+Vin
Analogue
Dim
0-10VDC
RCD-24-xxx
On/Off
(Optional)
LED DRIVER with 0-10V Interface
GND
3k3
2k4 1st LED
Last LED
LED Temperature (°C)
Output Current
100%
0%
50 60 70 80
25 90
+Vin
RCD-24-xxx/Vref
Automatic LED Overtemperature Protection
GND
PTC
Thermistor
1st LED
Last LED
Analog
Dimming
Thermally connected
Vref
R*
*Typically, choose R so that R=Rptc @ 85°C and R>660 Ohm.
LED Temperature Monitoring
Typical Response Curve (PTC = 500 Ohm @ 70°C)
RGB Driver
+Vin
Ana.
Dimming
RCD-24-xxx
LED DIMMER with high frequency PWM control
GND
C
1st LED
Last LED
R
10kHz
TTL
PWM
RCD-24
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REV:1/2011
LIGHTLINE
DC/DC-Converter
RCD-24
Series
Package Style and Pinning
3rd angle
projection
Bottom View
Top View
6
1
3
2
45
2.54
2.54
1.90ø SMT Pad
6.6
3.380
2.54
17.8
21.00
1.8
1.0
11.42
7.6
1.9
Solderball
Pin after
Reflow
1.90
3.180
SMD Version
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
XX.XXX ± 0.01 mm
Pin Connections RCD-24 SMD 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
(3 Vref Vref Version only)
4 GND Do not connect to -Vout
5 -Vout LED Cathode Connection
6 +Vout LED Anode Connection
Due to the compact size of the Open Frame version, a product code label is used instead of the whole part number.
The product code consists of RCD xxxx (where xxxx is the datecode) followed by an 8 digit reference code, e.g.
= RCD-24-0.35/SMD/OF, manufactured in Week 1 of 2010.
RCD 1001
80999186
Bottom View
Top View
6
1
3
2
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
2.30
2.46
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
(3 Vref Vref Version only)
4 GND Do not connect to -Vout
5 -Vout LED Cathode Connection
6 +Vout LED Anode Connection
Leave >1mm space arround case on PCB
for air circulation
Recommended Footprint Details
Pinned Version
The reference codes for standard parts are:
RCD-24-0.30/SMD/OF = 80999199
RCD-24-0.35/SMD/OF = 80999186
RCD-24-0.50/SMD/OF = 80999200
RCD-24-0.60/SMD/OF = 80999201
RCD-24-0.70/SMD/OF = 80999202
Other custom or semi-custom parts may have
different reference codes.
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REV: 1/2011
RCD-24
LIGHTLINE
DC/DC-Converter
RCD-24
Series
Package Style and Pinning
3rd angle
projection
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
3 (Blue) PWM Dimming /X2
2 + 3 (Green + Blue) Ana + PWM Dimming /X3
2 + 3 (Green + Yellow) Ana Dimming + Vref /Vref
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
/W/Vref Version
6
1
45
3
2
7.6
17.5
7.6
17.5
7.6
17.5
Wired Versions
Bottom View
/W Version
6
1
45
7.6
17.5
Wired Versions are packed in bags - 5pcs per bag.
Warning: Do not connect or disconnect the LED load while the converter is powered on.
This may damage or reduce the lifetime of the LED.