RECOM RCD-24-070/W/X3 Datasheet

www.recom-international.com L-3REV: 1/2014

RCD-24

EN-50121-3-2 Certified
EN-60950-1 Certified
UL-60950-1 Certified

Constant
Current LED
Driver

● 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

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) 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 or Wired

RCD-24-0.35

(a)(b)

4.5-36V 0-350 2-35 Digital + Analogue Vref Pins or Wired

RCD-24-0.50

(a)(b)

4.5-36V 0-500 2-35 Digital + Analogue Vref Pins or Wired

RCD-24-0.60

(a)(b)

4.5-36V 0-600 2-35 Digital + Analogue Vref Pins or Wired

RCD-24-0.70

(a)(b)

4.5-36V 0-700 2-35 Digital + Analogue Vref Pins or Wired

RCD-24-1.00

(b)

6-36V 0-1000 3-31 Digital + Analogue Pins or Wired

RCD-24-1.20

(b)

6-36V 0-1200 3-31 Digital + Analogue Pins or Wired

(a)(b)

Standard is no suffix with PCB Pins.

(a)

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)

Derating Graph

(Ambient Temperature)

Output Current (mA)

700

60

20

40

100

300

Ambient Temperature (°C)

0

80

-20

-40

Natural Convection

350

600

500

71

75

80

85

1000

1200

800

900

1100

65

Refer to Application Notes

E358085

LIGHTLINE

DC/DC-Converter

with 5 year Warranty

RoHS

2011/65/EU

6/6

RCD-24

L-4 www.recom-power.comREV:10/2014

Voltage Control (0-15V max)

Output Current

100%

0%

1V

2V

3V 4V 15V

0.13V

4.35V

Analogue Input Voltage

10V

300, 700, 1200mA

4.2V

1000mA

1

0

PWM Digital Control Signal

Output Current (LED appears dim)

200Hz

Typ.

LIGHTLINE

DC/DC-Converter

RCD-24
Series

Specifications (typical at 25°C, nominal input voltage, rated output current unless otherwise specified )

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
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 ±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) 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

Analogue Dimming

Digital Dimming

Output Current (LED appears bright)

PWM Digital Control Signal

1

0

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

2.6V

Vref Version Analogue Input Voltage

Standard Version:

Vref Version:

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.

www.recom-international.com L-5REV: 1/2014

RCD-24

LIGHTLINE

DC/DC-Converter

RCD-24
Series

Recommended Class B PCB Layout for Pinned Version

EMI Filter Suggestions

RCD-24-xxx
LED Driver

C1 =

2.2µF
Elect.

Low ESR

-Vin

-LED

+LED

4

5

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

L1

C1

C3

C5

C2

C4
C6

C8

C7

LED-

LED+

Vin+

Vin-

Pin
1

C2*

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

4

5

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

L-6 www.recom-power.comREV: 1/2014

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

2k7

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=R

ptc @ 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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LIGHTLINE

DC/DC-Converter

RCD-24
Series

Package Style and Pinning

Bottom View

Top View

6

1

3
2

4

5

Top View

Tc

7

10

7.62

2.54

1.00ø+0.15/0

0.6

8.50

12.55

4.1

2.54

17.78

22.10

2.30

2.46

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

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

Wired Versions

7.6

17.5

4

1

6

5

Bottom View

/W Version

L-8 www.recom-power.comREV: 1/2014

RCD-24

LIGHTLINE

DC/DC-Converter

RCD-24
Series

Package Style and Pinning

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

4

5

2

Bottom View

/W/X2 Version

6

1

4

5

3

Bottom View

/W/X3 Version

/W/Vref Version

6

1

4

5
3
2

7.6

17.5

7.6

17.5

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.

Wired Versions

The product information and specifications are subject to change without prior notice. All products are designed for non-safety critical commercial and industrial applications.

The Buyer agrees to implement safeguards that anticipate the consequences of any failures that might cause harm, loss of life and/or damage property.