UL/ RAILWAYS Certified Constant Current LED Driver Wide Input and Output Voltage Range Digital PWM and Analogue Voltage Dimming
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1 Features Regulated Converters Selection Guide 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 IP7 rated for /W Version 9% Efficiency 5 year Warranty Description The RCD series is a step-down constant current source designed for driving high power white LEDs. Standard output currents available are 3mA, 35mA, 5mA, ma, 7mA, ma and 2mA 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 IP7-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) -.3 (a) 4.5-3V Digital + Analogue Vref Pins or Wired -.35 (a) 4.5-3V Digital + Analogue Vref Pins or Wired -.5 (a) 4.5-3V Digital + Analogue Vref Pins or Wired -. (a) 4.5-3V Digital + Analogue Vref Pins or Wired -.7 (a) 4.5-3V Digital + Analogue Vref Pins or Wired -. -3V Digital + Analogue Pins or Wired -.2-3V Digital + Analogue Pins or Wired (a) Standard is no suffix with PCB Pins. (a) Add suffix /Vref for pinned version with Vref output and analogue dimming Add suffix /W for wired version without dimming control (four wires) Add suffix /W/X for wired version with analogue dimming control (five wires) Add suffix /W/X2 for wired version with PWM dimming control (five wires) 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) LIGHTLINE with 5 year Warranty Constant Current LED Driver RoHS 2/5/EU / E35885 EN Certified EN-95- Certified UL-95- Certified Specifications (typical at 25 C, nominal input voltage, rated output current unless otherwise specified ) Input Voltage (absolute maximum) 4VDC max Recommended Input Voltage 3mA-7mA 5V min. / 24V typ. / 3VDC max ma-2ma V min. / 24V typ. / 3VDC max Input Filter Capacitor Accuracy 3mA-7mA ±% typ, ±3% max. (Vin = 24DC) ma-2ma ±2% typ, ±5% max. Internal Power Dissipation Worst case load of 5 LEDs 8mW max Stability Vin=3V, Vout =-9 LEDs ±% max Output Ripple and Noise (2MHz BW) 3mA-7mA 5mVp-p max Vin=3V, Vout =-9 LEDs ma-2ma 3mVp-p max Temperature Coefficient -4 C to +85 C ambient ±.5%/ C max Maximum Capacitive Load μf Operating Frequency 3mA-7mA 2kHz min/ 25kHz typ/ 28kHz max ma-2ma 35kHz min/ 45kHz typ/ 55kHz max Efficiency at Full Load 9% max. Short Circuit Protection Regulated at rated output current continued on next page Derating-Graph (Ambient Temperature) (ma) Natural Convection Ambient Temperature ( C) Refer to Application Notes REV: /2 L-3
2 LIGHTLINE Specifications (typical at 25 C, nominal input voltage, rated output current unless otherwise specified ) Operating Temperature Range 3mA-35mA -4 C to +85 C (free air convection) 5mA -4 C to +8 C ma -4 C to +75 C 7mA-mA -4 C to +7 C 2mA -4 C to +5 C Storage Temperature Range -55 C to +25 C Maximum Case Temperature 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-V) Dimensions Pinned/Wired 22. x 2. x 8.5mm Weight Pinned/Wired 4.5g/.8g Soldering Profile Pinned 25 C/ 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 ) Remote ON/OFF DC/DC ON 3mA-7mA Open or V<Vr<.V Threshold Voltages ma-2ma Open or V<Vr<.8V DC/DC OFF (Standby) 3mA-7mA.<Vr<2.9V ma-2ma.4<vr<2.2v DC/DC OFF (Shutdown) 3mA-7mA 2.9V<Vr<V ma-2ma 2.2V<Vr<5V Remote Pin Drive Current Vr=5V ma max Quiescent Input Current in Shutdown Mode Vin=3V 2μA max Maximum PWM Frequency For Linear Operation 2Hz max. Frequency Limit Hz max. Analogue Dimming Control (leave open if not used - do not tie to ) Input Voltage Limits Standard -.3V - 5V Vref Version -.3V - 5V Control Voltage Range Full On.3V ± 5mV (see Graphs) 3, 7, 2mA: Full Off 4.2V ± 5mV ma: Full Off 4.35V ± mv Vref Version: Full Off 2.V ± mv Analogue Pin Drive Current Vc=5V.2mA max. Vref Version Vref Voltage 3.3V± 7mV Vref 5mA Vref Output Short Circuit Current 8mA typ. Environmental Relative Humidity 5% to 95% RH, non-condensing /W Versions IP7 Shock / Vibration EN373 EMC Railways EN52-3-2:2 Conducted Emissions (with filter, see note) EN5522 Class B Radiated Emissions (all series except >7mA) EN5522 Class B ESD EN-4-2 Criterion A Radiated Immunity EN-4-3 Criterion A Fast Transient EN-4-4 Criterion A Conducted Immunity EN-4- Criterion A MTBF (-.7, Nominal Vin, Full Load) +25 C 5 x ³ hours using MIL-HDBK 27F +7 C 5 x ³ hours Safety Standards EN General Safety Report: SPCLVD98EN95-2nd Edition EMC Railway Report: 2A825E-C EN UL General Safety Report: E35885-A3 UL95- CSA C22.2 No Note:. Requires an input filter to meet EN5522 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. Digital Dimming PWM Digital Control Signal (LED appears dim) % 2Hz Typ. Analogue Dimming Standard Version: PWM Digital Control Signal 2Hz Typ. (LED appears bright) Analogue Input Voltage ma 3, 7, 2mA % V 2V 3V 4V V 5V.3V 4.35V Vref Version: % % Voltage Control (-5V max) 4.2V V 2V 3V 4V 5V.3V 2.V Combined PWM and Analogue Dimming PWM Digital Control Signal Max* Vref Version Analogue Input Voltage Voltage Control (-5V max) * Max output current can also be set using Analogue input L-4 REV: /2
3 Typical Characteristics Efficiency/Load Dropout Voltage/Load /Accuracy/Load Standard Application Circuit (no external components required for normal use) EMI Filter Suggestions (see text) 4 -xxx Analogue Dim 2 PWM Dim On/Off 3 5 Snubber circuit optional (needed only for long supply leads or low impedance sources). Recommended component values = µf MLCC + R st LED Voltage Across Converter Input Pins Test conditions: 24V supply, m long leads Without snubber 24. With snubber Time (µs) C L CLASS A -xxx LED Driver +LED C = 2.2µF Elect. Low ESR L C2 C2* CLASS B -xxx LED Driver +LED -Vin -LED -Vin LED C=μF MLCC L = 22μH C=2.2μF MLCC L = 47μH C3 C4 C5 C Recommended Class B PCB Layout for Pinned Version Vin+ LED- Vin- C L C3 C5 Pin C2* C2 C4 C Top View C8 C7 LED+ C7 C No dimming or PWM dimming: L = 47μH C2 = C3 = nf MLCC Other caps not required Analogue Dimming used: L = 2μH C2 = C7 = nf MLCC Other caps not required L = 22μH C2 = nf C3 = C5 = 2.2nF C4 = C = C7 = C8 = nf All capacitors MLCC C2* = optional 2μ2 MLCC only if L starts to resonate with the back ripple current. REV: /2 L-5
4 Application Examples LED DRIVER with -V Interface LED DIMMER for up to white LEDs Analogue Dim -VDC On/Off (Optional) 2k7 3k3 -xxx st LED Manual Dimming Control -xxx/vref Dim Vref K st LED MULTIPLE LED DRIVER (up to 2 LEDS) Analogue Dim PWM Dim/ On/Off -.7 st LED 2x NPN.5~. Ohm LED DIMMER with high frequency PWM control khz TTL PWM R C -xxx Ana. Dimming st LED Driving Two Strings of 35mA LEDs with one 7mA Driver using a current mirror Note: It is not possible to parallel the drivers to increase the current. LED Temperature Monitoring RGB Driver Automatic LED Overtemperature Protection R* PTC Thermistor Vref Analog Dimming -xxx/vref st LED Thermally connected *Typically, choose R so that 85 C and R> Ohm. Typical Response Curve (PTC = 5 7 C) % % LED Temperature ( C) L- REV: /2
5 Package Style and Pinning Pinned Version Pin Connections Pin # Out Comments ø+.5/ 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 Do not connect to -Vout Leave >mm space arround case on PCB for air circulation 2.54 Top View Recommended Footprint Details Vout LED Cathode Connection +Vout LED Anode Connection XX.X ±.5 mm XX.XX ±.25 mm Pin Tolerance ±. mm Wired Versions 7 Tc Top View /W Version 7. Wire Connections /W Wire # Function Comments (Red) DC Supply 4 (Black) Do not connect to -Vout 5 (Brown) -Vout LED Cathode Connection (Yellow) +Vout LED Anode Connection Wire length = mm + mm stripped & tinned = mm total Wire outside diameter =.mm Wire core diameter =.75mm Wire is UL/CSA listed/ 22AWG / 3V Rated REV: /2 L-7
6 Package Style and Pinning Wired Versions /W/X Version /W/X2 Version /W/X3 Version 2 /W/Vref Version Wire Connections /W/X Wire # Function Comments 2 (Green) Ana Dimming /X 3 (Blue) PWM Dimming /X (Green + Blue) Ana + PWM Dimming /X (Green + Yellow) Ana Dimming + Vref /Vref Wire length = mm + mm stripped & tinned = mm total Wire outside diameter =.mm Wire core diameter =.75mm Wire is UL/CSA listed/ 22AWG / 3V Rated 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: /2
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