● Features ● ● ● ● ● ● ● Regulated Converters UL/ RAILWAYS Certified Constant Current LED Driver Wide Input and Output Voltage Range Digital PWM and Analogue Voltage Dimming Short Circuit Protected Pinned or Wired Versions IP67 rated for /W Version 96% Efficiency 5 year Warranty LIGHTLINE DC/DC-Converter with 5 year Warranty Constant Current LED Driver 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. Selection Guide Part Number RCD-24-0.30(a)(b) Input Range (VDC) 4.5-36V Output Output Dimming Current Voltage Control (mA) (Vmin-Vmax) 0-300 2-35 Digital + Analogue RCD-24-0.35(a)(b) 4.5-36V 0-350 2-35 Digital + Analogue (a)(b) 4.5-36V 0-500 2-35 RCD-24-0.60(a)(b) 4.5-36V 0-600 2-35 RCD-24-0.70(a)(b) RCD-24-0.50 Options Mounting Style Vref Pins or Wired Vref Pins or Wired Digital + Analogue Vref Pins or Wired Digital + Analogue Vref Pins or Wired Vref Pins or Wired 4.5-36V 0-700 2-35 Digital + Analogue 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. 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) RoHS 2011/65/EU 6/6 E358085 EN-50121-3-2 Certified EN-60950-1 Certified UL-60950-1 Certified (a) RCD-24 Specifications (typical at 25°C, nominal input voltage, rated output current unless otherwise specified ) 300mA-700mA 1000mA-1200mA 40VDC max 5V min. / 24V typ. / 36VDC max 6V min. / 24V typ. / 36VDC max Input Filter Output Current Accuracy (Vin = 24DC) 300mA-700mA 1000mA-1200mA Capacitor ±1% typ, ±3% max. ±2% typ, ±5% max. Internal Power Dissipation Worst case load of 5 LEDs 800mW max Output Current Stability Output Ripple and Noise (20MHz BW) Vin=36V, Vout =1-9 LEDs Vin=36V, Vout =1-9 LEDs 300mA-700mA 1000mA-1200mA ±1% max 150mVp-p max 300mVp-p max Temperature Coefficient -40°C to +85°C ambient ±0.015%/°C max Maximum Capacitive Load Operating Frequency 300mA-700mA 1000mA-1200mA 100μF 210kHz min/ 250kHz typ/ 280kHz max 350kHz min/ 450kHz typ/ 550kHz max Efficiency at Full Load Short Circuit Protection (Ambient Temperature) 65 1200 1100 1000 900 800 71 Natural Convection 700 600 500 75 80 85 350 300 -40 -20 0 20 40 60 80 100 Ambient Temperature (°C) 96% max. Regulated at rated output current continued on next page www.recom-power.com Derating-Graph Output Current (mA) Input Voltage (absolute maximum) Recommended Input Voltage REV: 0/2015 Refer to Application Notes L-3 RCD-24 Series 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 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 Safety Standards EN General Safety Report: SPCLVD1109081EN60950-1 2nd Edition EMC Railway Report: 12A082105E-C EN50121-3-2 UL General Safety Report: E358085-A3 UL60950-1 CSA C22.2 No 60950-1-03 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: 0/2015 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: Analogue Input Voltage 100% Output Current 300mA-350mA 500mA 600mA 700mA-1000mA 1200mA 1000mA 300, 700, 1200mA 0% 0.13V 1V 3V 2V Voltage Control (0-15V max) 4V 10V 15V 4.35V 4.2V Vref Version: Vref Version Analogue Input Voltage 100% Output Current RCD-24 Operating Temperature Range (free air convection) 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 www.recom-power.com RCD-24 Series LIGHTLINE DC/DC-Converter Typical Characteristics +Vin 1 (see text) GND RCD-24-xxx Voltage Across Converter Input Pins Standard Application Circuit (no external components required for normal use) 6 1st LED 4 Analogue Dim PWM Dim On/Off Last LED 2 5 3 Snubber circuit optional (needed only for long supply leads or low impedance sources). Recommended component values = 10µF MLCC + 1R Test conditions: 24V supply, 10m long leads. 32.4 Without snubber 24.0 With snubber 0 -40 -20 0 40 20 Time (µS) 60 80 EMI Filter Suggestions 1 +LED 6 CLASS A C1 = 2.2µF Elect. Low ESR RCD-24-xxx LED Driver C1 -Vin 4 5 RCD-24-0.30 - RCD-24-0.70 C1=1μF MLCC L1 = 22μH +Vin -LED L1 1 C2 C2* -Vin RCD-24-1.00 - RCD-24-1.20 C1=2.2μF MLCC L1 = 47μH CLASS B 6 +LED 5 -LED RCD-24-xxx LED Driver 4 2 3 C3 C4 C5 C6 C7 C8 Recommended Class B PCB Layout for Pinned Version C2* Vin+ L1 C1 Pin 1 C3 C5 Vin- www.recom-power.com C2 RCD-24-0.30 - RCD-24-0.70 RCD-24-1.00 - RCD-24-1.20 Top View C8 LED+ C7 LED- C4 C6 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 REV: 0/2015 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. L-5 RCD-24 L1 +Vin RCD-24 Series LIGHTLINE DC/DC-Converter Application Examples LED DRIVER with 0-10V Interface LED DIMMER for up to 10 white LEDs +Vin +Vin RCD-24-xxx GND 1st LED 2k7 Analogue Dim 0-10VDC 3k3 RCD-24-xxx/Vref GND Manual Dimming Control Last LED Dim Vref 10K 1st LED Last LED On/Off (Optional) MULTIPLE LED DRIVER (up to 20 LEDS) +Vin LED DIMMER with high frequency PWM control RCD-24-0.70 +Vin 1st LED GND RCD-24-xxx GND Analogue Dim Last LED PWM Dim/ On/Off 10kHz TTL PWM 2x NPN 0.5~1.0 Ohm C R Ana. Dimming 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. RGB Driver Automatic LED Overtemperature Protection +Vin R* RCD-24-xxx/Vref Vref Analog Dimming PTC Thermistor 1st LED Last LED GND Thermally connected *Typically, choose R so that R=Rptc @ 85°C and R>660 Ohm. Typical Response Curve (PTC = 500 Ohm @ 70°C) 100% Output Current RCD-24 LED Temperature Monitoring 0% 25 L-6 50 70 60 LED Temperature (°C) 80 90 REV: 0/2015 www.recom-power.com RCD-24 Series LIGHTLINE DC/DC-Converter Package Style and Pinning Pinned Version 22.10 12.55 Pin Connections 8.50 4.1 0.6 17.78 7.62 1.00 ø+0.15/0 5 4 3 Bottom View 2 6 1 2.30 2.46 Leave >1mm space arround case on PCB for air circulation 2.54 Top View 2.54 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 XX.X ± 0.5 mm XX.XX ± 0.25 mm Pin Tolerance ± 0.1 mm Recommended Footprint Details 7 10 Tc RCD-24 Top View Wired Versions 4 1 17.5 Bottom View /W Version Wire Connections 5 7.6 6 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 www.recom-power.com REV: 0/2015 L-7 RCD-24 Series LIGHTLINE DC/DC-Converter Package Style and Pinning Wired Versions 17.5 5 4 Bottom View 2 /W/X1 Version 6 1 7.6 Wire Connections 17.5 5 4 3 Bottom View /W/X2 Version 6 1 Wire # 7.6 RCD-24/W/X Series Function Comments 2 (Green) Ana Dimming /X1 3 (Blue) PWM Dimming /X2 2 + 3 (Green + Blue) Ana + PWM Dimming 2 + 3 (Green + Yellow) Ana Dimming + Vref /X3 /Vref Wire length = 100mm + 10mm stripped & tinned = 110mm total Wire outside diameter = 1.6mm 17.5 RCD-24 5 4 Bottom View 3 /W/X3 Version 2 /W/Vref Version 6 1 Wire core diameter = 0.75mm Wire is UL/CSA listed/ 22AWG / 300V Rated 7.6 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. The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit written consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications. L-8 REV: 0/2015 www.recom-power.com