Features Regulated Converters Description UL Certified Constant Current LED Driver Wide Input and Output Voltage Range Digital PWM and Analogue Voltage Dimming Short Circuit and Overtemperature Protected Pin, Wire or Open Frame SMD Versions IP7 rated for /W Version 9% Efficiency 5 year Warranty The RCD series is a step-down constant current source designed for driving high power white LEDs. Standard output currents available are ma, 5mA, 5mA, ma, 7mA, ma and ma 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), an open frame version with SMD pins (/SMD/OF) and a version with built-in reference output voltage (/Vref) to power sensors or for easy analogue dimming. LIGHTLINE with 5 year Warranty Constant Current LED Driver Selection Guide Part Input Output Output Dimming Options Mounting Number Range Current Voltage Control Style (VDC) (ma) (Vmin-Vmax) -. (a) 4.5-V - -5 Digital + Analogue Vref Pins, SMD or Wired -.5 (a) 4.5-V -5-5 Digital + Analogue Vref Pins, SMD or Wired -.5 (a) 4.5-V -5-5 Digital + Analogue Vref Pins, SMD or Wired -. (a) 4.5-V - -5 Digital + Analogue Vref Pins, SMD or Wired -.7 (a) 4.5-V -7-5 Digital + Analogue Vref Pins, SMD or Wired -. -V - - Digital + Analogue Pins or Wired -. -V - - Digital + Analogue Pins or Wired (a) Standard is no suffix with PCB Pins. (a) Add suffix /Vref for pinned or SMD versions with Vref output and analogue dimming (a) Add suffix /SMD/OF for open frame version with SMD solderpins (/SMD/OF-R for Tape and Reel Packaging) 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/X for wired version with PWM dimming control (five wires) Add suffix /W/X 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 /95/EC / E47 EN-95- Certified UL-95- Certified (Vref Version Pending) Specifications ( typical at 5 C, nominal input voltage, rated output current unless otherwise specified ) Input Voltage (absolute maximum) 4VDC max Recommended Input Voltage ma-7ma 5V min. / 4V typ. / VDC max ma-ma V min. / 4V typ. / VDC max Input Filter Capacitor Accuracy ma-7ma ±% typ, ±% max. (Vin = 4DC) ma-ma ±% typ, ±5% max. Internal Power Dissipation Worst case load of 5 LEDs 8mW max Stability Vin=V, Vout =-9 LEDs ±% max Output Ripple and Noise (MHz BW) ma-7ma 5mVp-p max Vin=V, Vout =-9 LEDs ma-ma mvp-p max Temperature Coefficient -4 C~+85 C ambient ±.5%/ C max Maximum Capacitive Load μf Operating Frequency ma-7ma khz min/ 5kHz typ/ 8kHz max ma-ma 5kHz 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) www.recom-international.com REV:/ (ma) 9 8 7 5 Natural Convection 5 7 75 8 5 85-4 - 4 8 Ambient Temperature ( C) Refer to Application Notes
Specifications -Continued Operating Temperature Range ma-5ma -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 ma -4 C to +5 C Storage Temperature Range -55 C to +5 C Overtemperature Shutdown Internal IC Temperature 5 C typ. (Auto-restart after cool down) Temperature Hysteresis C typ. 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. x. x 8.5mm SMD. x.4 x mm Weight Pinned/Wired 4.5g/.8g SMD.9g Soldering Profile Pinned 5 C/ sec. max SMD 45 C/ sec. max Packing Quantities Pinned Versions 9pcs per Tube (Refer to App Notes for Tube sizes) SMD Versions pcs per Tube SMD Tape and Reel 5pcs per Reel 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 ma-7ma Open or V<Vr<.V Threshold Voltages ma-ma Open or V<Vr<.8V DC/DC OFF (Standby) ma-7ma.<vr<.9v ma-ma.4<vr<.v DC/DC OFF (Shutdown) ma-7ma.9v<vr<v ma-ma.v<vr<5v Remote Pin Drive Current Vr=5V ma max Quiescent Input Current in Shutdown Mode Vin=V μa max Maximum PWM Frequency For ±% Linear Operation Hz max. Frequency Limit Hz max. Analogue Dimming Control (leave open if not used - do not tie to ) Input Voltage Limits Standard -.V - 5V Vref Version -.V - 5V Control Voltage Range Full On.V ± 5mV (see Graphs) Standard: Full Off 4.5V ± 5mV Vref Version: Full Off.V ± 5mV Analogue Pin Drive Current Vc=5V.mA max. Vref Version Vref Voltage.V± 7mV Vref 5mA Vref Output Short Circuit Current 8mA typ. Environmental Relative Humidity 5% to 95% RH, non-condensing /W Versions IP7 Conducted Emissions (with filter, see note) EN55 Class B Radiated Emissions (all series except >7mA) EN55 Class B ESD (all series) EN-4- Class A Radiated Immunity (all series) EN-4- Class A Fast Transient (all series) EN-4-4 Class A Conducted Immunity (all series) EN-4- Class A MTBF (-.7, Nominal Vin, Full Load) +5 C 5 x ³ hours using MIL-HDBK 7F +7 C 5 x ³ hours Note: Requires an input filter to meet EN55 Class B conducted emissions - see next page Digital Dimming % V V V 4V V.V 4.5V 5V Voltage Control (-5V max) REV: / www.recom-electronic.com % PWM Digital Control Signal 5~ Hz Typ. (LED appears dim) Analogue Dimming Standard Version: Vref Version: % PWM Digital Control Signal 5~ Hz Typ. (LED appears bright) Analogue Input Voltage % V V V 4V 5V.V.V Voltage Control (-5V max) Combined PWM and Analogue Dimming PWM Digital Control Signal Max* Vref Version Analogue Input Voltage * Max output current can also be set using Analogue input
Typical Characteristics Standard Application Circuit (no external components required for normal use) EMI Filter Suggestions (see text) 4 -xxx Analogue Dim PWM Dim On/Off 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: 4V supply, m long leads..4 Without snubber 4. With snubber -4-4 8 Time (µs) C L CLASS A -xxx LED Driver +LED C =.µf Elect. Low ESR L C C* CLASS B -xxx LED Driver +LED -Vin -LED -Vin 4 5 -LED -. - -.7 C=μF MLCC L = μh -. - -. C=.μF MLCC L = 47μH C C4 C5 C Recommended Class B PCB Layout for Pinned / SMD Versions Vin+ LED- Vin- C L C C5 Pin C* C C4 C Top View C8 C7 LED+ www.recom-international.com REV:/ C7 C8 -. - -.7 No dimming or PWM dimming: L = 47μH C = C = nf MLCC Other caps not required Analogue Dimming used: L = μh C = C7 = nf MLCC Other caps not required -. - -. L = μh C = nf C = C5 =.nf C4 = C = C7 = C8 = nf All capacitors MLCC C* = optional μ MLCC only if L starts to resonate with the back ripple current.
Application Examples LED DRIVER with -V Interface LED DIMMER for up to white LEDs Analogue Dim -VDC On/Off (Optional) k4 k -xxx st LED Manual Dimming Control -xxx/vref Dim Vref K st LED MULTIPLE LED DRIVER (up to LEDS) LED DIMMER with high frequency PWM control Analogue Dim PWM Dim/ On/Off -.7 st LED x NPN.5~. Ohm khz TTL PWM R C -xxx Ana. Dimming st LED Driving Two Strings of 5mA LEDs with one 7mA Driver using a current mirror 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 R=Rptc @ 85 C and R> Ohm. Typical Response Curve (PTC = 5 Ohm @ 7 C) % % 5 5 7 8 9 LED Temperature ( C) 4 REV:/ www.recom-electronic.com
Package Style and Pinning Pinned Version rd angle projection..55 8.5 Pin Connections Pin # Out Comments 7.5. 4. 7.. ø+.5/ DC Supply Analogue Dimming Leave open if not used PWM/ON/OFF Leave open if not used ( Vref Vref Version only) 4 Do not connect to -Vout..4 Leave >mm space arround case on PCB for air circulation.54 Top View Recommended Footprint Details.54 5 -Vout LED Cathode Connection +Vout LED Anode Connection XX.X ±.5 mm XX.XX ±.5 mm Pin Tolerance ±. mm SMD Version.8..8..54 Solderball Pin after Reflow.8.9 rd angle projection. 7.8.9.4 7..9ø SMT Pad.54 Top View.54 Pin Connections SMD Pin # Out Comments DC Supply Analogue Dimming Leave open if not used PWM/ON/OFF Leave open if not used ( Vref Vref Version only) 4 Do not connect to -Vout 5 -Vout LED Cathode Connection +Vout LED Anode Connection XX.X ±.5 mm XX.XX ±.5 mm XX.XXX ±. mm Due to the compact size of the Open Frame version, a product code label is used instead of the whole part number. The product code consists of RCD xxxx (where xxxx is the datecode) followed by an 8 digit reference code, e.g. RCD 89998 = -.5/SMD/OF, manufactured in Week of. The reference codes for standard parts are: -./SMD/OF = 899999 -.5/SMD/OF = 89998 -.5/SMD/OF = 8999 -./SMD/OF = 8999 -.7/SMD/OF = 8999 Other custom or semi-custom parts may have different reference codes. www.recom-international.com REV:/ 5
Package Style and Pinning Wired Versions rd angle projection Wire Connections /W 7.5 /W Version 7. 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/ AWG / V Rated 7.5 /W/X Version 7. Wire Connections /W/X 7.5 /W/X Version 7. Wire # Function Comments (Green) Ana Dimming /X (Blue) PWM Dimming /X + (Green + Blue) Ana + PWM Dimming /X + (Green + Yellow) Ana Dimming + Vref /Vref 7.5 /W/X Version /W/Vref Version 7. Wire length = mm + mm stripped & tinned = mm total Wire outside diameter =.mm Wire core diameter =.75mm Wire is UL/CSA listed/ AWG / V 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. REV: / www.recom-electronic.com