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Constant
Current
Single Output
INNOLINE
DC/DC-Converter
RCD-24
Series
●Constant Current Output
●Power LED Driver
●Wide Input Voltage Range
●PWM/Digital Dimming and Analogue
Voltage Dimming
●Short Circuit Protected
●96% Efficiency
Features
Regulated
Converters
Selection Guide
Part Input Output Output Dimming Efficiency
Number Range Current Voltage Control max.
(VDC) (mA) (V) (%)
RCD-24-0.30 4.5-36V 0-300 2-32 Digital + Analogue 96
RCD-24-0.35 4.5-36V 0-350 2-32 Digital + Analogue 96
RCD-24-0.50 4.5-36V 0-500 2-32 Digital + Analogue 96
RCD-24-0.60 4.5-36V 0-600 2-32 Digital + Analogue 96
RCD-24-0.70 4.5-36V 0-700 2-32 Digital + Analogue 96
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 >1.5~4V 300mA-700mA
Output Current Accuracy 300mA-700mA ±2% typ.
Internal Power Dissipation Load of 5 LEDs 700mW
Output Current Stability Vin=36V, Vout =2~32V ±1% max
Output Ripple and Noise (20MHz limited) Vin=36V, Vout =2~32V 120mVp-p max
Temperature Coefficient -40~+85°C ambient ±0.015%/°C max.
Maximum Capacitive Load 100μF
Operating Frequency 210 kHz min/ 260kHz typ./ 300kHz 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 -40°C to +71°C
Storage Temperature Range -55°C to +125°C
Maximum Case Temperature 100°C
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.
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 and 700mA 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 inde-
pendent 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 of 85°C.
Rev.1
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
RCD-24-0.35/0.70
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2008
INNOLINE
DC/DC-Converter RCD-24
Series
Specifications -Continued
PWM Dimming and ON/OFF Control (Leave open if not used)
Remote ON/OFF DC/DC ON Open or 0V<Vr<0.6V
DC/DC OFF (Standby) 0.6<Vr<2.9V
DC/DC OFF (Shutdown) 2.9V<Vr<6V
Remote Pin Drive Current Vr=5V 1mA max.
Quiescent Input Current in Shutdown Mode Vin=36V, Vr>2.9V 200μA max.
Maximum PWM Frequency for Linear Operation (measured 10%~90% Dimming) 200Hz
Analogue Dimming Control (leave open if not used)
Input Voltage Range 0 - 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
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, see below.
Efficiency (%)
100
20
10
Output Voltage (V)
50
30
0
Vin = 24V, Iout = 300-700mA
Efficiency (%)
100
20
10
Output Voltage (V)
50
30
0
Vin = 32V, Iout = 300-700mA
Class B Filter Suggestion
RCD-24-xxx
LED Driver
2.5µF
Elect.
-Vin -LED
+LED
45
6
+Vin
47µH (not dimmed)
or
120µH (dimmed) 1
10nF
Cer.
10nF, Cer.
(only if Analogue Dimming is used)
2
10nF, Cer.
(only if Analogue Dimming is not used)
C1 or C2
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INNOLINE
DC/DC-Converter RCD-24
Series
Voltage Control (0-15V max)
Output Current
100%
0%
1V 2V 3V 4V 15V
0.13V 4.5V
Analogue Input Voltage
1
0
PWM Digital Control Signal
Output Current (LED appears dim) Output Current (LED appears bright)
PWM Digital Control Signal
1
0
0~
200Hz
0~
200Hz
+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
24VDC
Manual
Dimming
Control
RCD-24-xxx
LED DIMMER for up to 7 white LEDs
GND
1K Pot.
1st LED
Last LED
4k7
Analogue Dimming Control and Application Circuit Examples
Digital Dimming Control
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INNOLINE
DC/DC-Converter RCD-24
Series
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
Through Hole Case Style
Leave 1 mm space arround case on pcb Recommended Footprint Details
Standard Application Circuits
+Vin
Analogue
Dim
RCD-24-xxx
PWM
Dim/
On/Off
LED DRIVER
GND 1st LED
Last LED
+Vin
Analogue
Dim
RCD-24-0.70
PWM
Dim/
On/Off
Driving Two Strings of 350mA LEDs with one 700mA Driver.
MULTIPLE LED DRIVER (up to 20 LEDS)
GND 0.5~1.0 Ohm
1st LED
Last LED