Features
Regulated
Converters
Rev.2
Description
●
●
●
●
●
●
●
Constant Current Output
Power LED Driver
Wide Input Voltage Range
PWM/Digital Dimming , Analogue
Voltage and Potentiometer Dimming
Short Circuit Protected
96% Efficiency
SMD Option
INNOLINE
DC/DC-Converter
RCD-24B
Series
Constant
Current
Single Output
The RCD series is a step-down constant current source designed for driving high power white LEDs. The standard
output current is 700mA. Despite its compact size, the RCD series is fully featured with very high efficiency, wide input
voltage range, high ambient operating temperature and three means of LED dimming: PWM/digital control, analogue
voltage and potentiometer dimming. All 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 of 85°C. An SMD version is
also available.
Selection Guide
Part
Number
RCD-24B-0.70
Input
Range
(VDC)
4.5-36V
Output
Current
(mA)
0-700
0-700
Output
Voltage
(V)
2-32
2-32
Dimming
Control
Digital/Analogue/Pot.
Digital/Analogue/Pot.
Mounting
Style
Through Hole
SMD
RCD-24B-0.70/SMD 4.5-36V
Specifications
( typical at 25°C, nominal input voltage, rated output current unless otherwise specified )
Input Voltage (absolute maximum)
Recommended Input Voltage
Input Filter
Output Voltage Range
Output Current Range
Output Current Accuracy
Internal Power Dissipation
Output Current Stability
Output Ripple and Noise (20MHz limited)
Temperature Coefficient
Maximum Capacitive Load
Operating Frequency
Efficiency at Full Load
Short Circuit Protection
Operating Temperature Range
Storage Temperature Range
Maximum Case Temperature
Thermal Impedance
Case Material
Potting Material
Dimensions
Weight
Wave Soldering Profile
Natural Convection
Vin=36V
Vin - Vout >1.5~4V
700mA
Load of 5 LEDs
Vin=36V, Vout =2~28V
Vin=36V
-40~+85°C ambient
36VDC max.
5V min. / 24V typ. / 36VDC max.
Capacitor
2V min. / 32V max.
700mA
±2% typ. /±3% max.
700mW
±1% max
120mVp-p max
±0.015%/°C max.
100μF
210 kHz min/ 250kHz typ./ 300kHz max
96% max.
Regulated at rated output current
Natural Convection
-40°C to +71°C
-55°C to +125°C
100°C
55°C/Watt
Non Conductive Black Plastic
Epoxy (UL94-V0)
24.2 x 14.5 x 9.7mm
Max. 265°C/10 sec.
Derating Graph
(Ambient Temperature)
RCD-24B-0.70
700
71
Output Current (mA)
6.5g
500
Natural Convection
IMPORTANT INFORMATION: The RCD-24B-0.70/SMD series are not suitable to be soldered using vapour
phase soldering, they are only guaranteed to be safe in IR or convection reflow ovens and by hand
soldering. Reflow conditions should not exceed the limits of the Jedec STD-020C profile. This restriction
applies to the product series R-78Ax.x-0.5SMD, R-78Ax.x-1.0SMD and RCD-24B-0.70/SMD only and
does not affect any other RECOM products. For more details regarding this matter please contact
info@recom-development.at
www.recom-international.com
2008
300
-40 -20 0 20 40 60 80 100
Ambient Temperature (°C)
1
INNOLINE
DC/DC-Converter
Specifications
-Continued
PWM Dimming and ON/OFF Control (Leave open if not used)
Remote ON/OFF
DC/DC ON
DC/DC OFF (Standby)
DC/DC OFF (Shutdown)
Remote Pin Drive Current
Quiescent Input Current in Shutdown Mode
Maximum PWM Frequency
Analogue Dimming Control (leave open if not used)
Input Voltage Range
Control Voltage Range Limits
(see Graph)
Analogue Pin Drive Current
Potentiometer Dimming Control (leave open if not used)
Resistor Value
Environmental
Relative Humidity
Conducted Emissions
Radiated Emissions
ESD
Radiated Immunity
Fast Transient
Conducted Immunity
using MIL-HDBK 217F
(see note)
5% to 95% RH, non-condensing
EN55022
Class A
EN55022
Class A
EN61000-4-2
Class A
EN61000-4-3
Class A
EN61000-4-4
Class A
EN61000-4-6
Class A
+25°C
+71°C
TBD x 10³ hours
TBD x 10³ hours
40
RCD-24B
Series
Vin = 24V, Iout = 700mA
Open or 0V<Vr<0.6V
0.6<Vr<2.9V
2.9V<Vr<6V
1mA max.
50Hz-200Hz
2kHz
0 - 15V
Full On
Full Off
Vc=5V
0.13V ± 50mV
4.5V ± 50mV
0.2mA max.
10kOhm
50
100
Vr=5V
Vin=36V, Vr>2.9V
PWM Frequency Range for Linear Operation (measured over 10%~90% brightness)
Efficiency (%)
0
200μA max.
50
10
20
30
Output Voltage
(V)
Vin = 36V, Iout = 700mA
100
Efficiency (%)
0
10
20
30
Output Voltage
(V)
Minimum Dropout Voltage
MTBF (RCD-24-0.70, Nominal Vin, Full Load)
Input Voltage (V)
Note: Requires an input filter to meet EN55022 Class A and Class B conducted emissions.
30
20
10
0
0
Operating Area
10
20
Output Voltage
(V)
30
Standard Application Circuits
LED DRIVER
+Vin
GND
Analogue
Dim
PWM
Dim/
On/Off
Potentiometer Dim
+V
out
+V
in
RCD-24B-0.70
-V
out
-V
in
V
ana
V
dig
V
adj
V
ref
MULTIPLE LED DRIVER (up to 20 LEDS)
+Vin
+V
out
RCD-24-0.70
-V
out
-V
in
V
ana
V
dig
V
adj
V
ref
+V
in
0.5~1.0 Ohm
1st LED
Last LED
GND
Analogue
Dim
PWM
Dim/
On/Off
1st LED
Last LED
Potentiometer Dim
Driving Two Strings of 350mA LEDs with one 700mA Driver.
2
2008
www.recom-electronic.com
INNOLINE
DC/DC-Converter
Analogue Dimming Control and Application Circuit Examples
RCD-24B
Series
100%
Analogue Input Voltage
LED DRIVER with 0-10V Interface
+Vin
GND
Analogue
Dim
0-10VDC
2k4
3k3
RCD-24-xxx
Output Current
1st LED
Last LED
0%
0.13V
1V
2V
3V
4V
4.5V
15V
Voltage Control (0-15V max)
On/Off
(Optional)
Potentiometer Dimming Control and Application Circuit Examples
100%
LED DIMMER for up to 7 white 2W LEDs
Output Current
24VDC
GND
+V
out
+V
in
RCD-24B-0.70
-V
in
V
adj
V
ref
-V
out
Manual
Dimming
Control
10K Pot.
1st LED
Last LED
0%
R2 10kW
R1 0W
Potentiometer Control
0W
10kW
LED DIMMER with Digital Potentiometer Interface
Vin
GND
+V
in
+V
out
RCD-24B-0.70
-V
in
V
adj
V
ref
-V
out
V
dd
G
nd
RH
RW
RL
1st LED
Last LED
Digital
Dimming
Control
U/D
Sel
Non-Volatile Digital
Potentiometer
www.recom-international.com
2008
3
INNOLINE
Digital Dimming Control
DC/DC-Converter
RCD-24
Series
PWM Digital Control Signal
1
0
0~
200Hz
PWM Digital Control Signal
1
0
Output Current
Max*
0
* Max output current can also be set using Analogue input
PWM Digital Control Signal
1
0
0~
200Hz
Output Current (LED appears dim)
Output Current (LED appears bright)
Package Style and Pinning
Through Hole Case Style
24.2
9.70
2.54
0.50
1 2 3 4
7 8
3rd angle
projection
14.50
4.60
Pin Connections
Pin #
RCD-24B Series
Out
GND
Comments
Do not connect to -Vout
Leave open if not used
Leave open if not used
LED Cathode Connection
LED Anode Connection
Leave open if not used
Leave open if not used
DC Supply
16.9
±
0.2
1.00 dia.
2.54
1,2
3
4
7,8
9,10
13
PWM/ON/OFF
Analogue Dimming
-Vout
+Vout
Vadj
Vref
+Vin
14.50
Bottom View
16 15 14 13
10 9
2.54
14
15,16
7 x 2.54
Leave 1 mm space arround case on pcb
Top View
Recommended Footprint Details
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
Pin Tolerance ± 0.1 mm
SMD Case Style
24.2
10.20
9.70
2.54
Pin area
1.6 x 0.50
1 2 3 4
14.50
18.55
0.50
7 8
2.54
1.2
3.6
15.35
Bottom View
16 15 14 13
10 9
20.6
13.4
1
Top View
7 x 2.54
17.78
4
2008
www.recom-electronic.com
MCU
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