BCR405UW6Q 50 to 100mA LED CONSTANT CURRENT REGULATOR in SOT26 Description Features This Linear LED driver is designed to meet the stringent requirements of automotive applications. The BCR405UW6 monolithically integrates a transistor, diodes and resistors to function as a Constant Current Regulator (CCR) for LED driving. The device regulates with a preset 50mA nominal that can be adjusted with external resistor up to 100mA. It is designed for driving LEDs in strings and will reduce current at increasing temperatures to self-protect. Operating as a series linear CCR for LED string current control then it can be used in applications with supply voltages up to 40V. LED Constant Current Regulator Using PNP Emitter-Follower with Emitter Resistor to Current Limit IOUT = 50mA 10% constant current (Preset) IOUT up to 100mA adjustable with an external resistor VS - 40V Supply Voltage PD up to 1W in SOT26/ SC74R LED dimming using PWM up to 25kHz Negative temperature coefficient (NTC) reduces Iout with increasing temperature Parallel devices to increase regulated current Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Qualified to AEC-Q101 Standards for High Reliability PPAP Capable (Note 4) With no need for additional external components, this CCR is fully integrated into a SOT26 minimizing PCB area and component count. Applications Mechanical Data Constant current regulation (CCR) in automotive LED lighting: Interior and Exterior Automotive LED Lighting Dome and Mood Lighting Puddle Lighting Side Marker Lights Case: SOT26 (SC-74) Case Material: Molded Plastic. "Green" Molding Compound. UL Flammability Rating 94V-0 Moisture Sensitivity: Level 1 per J-STD-020 Terminals: Finish - Matte Tin Plated Leads, Solderable per MIL-STD-202, Method 208 Weight: 0.018 grams (Approximate) SOT26 (SC-74) GND Rext OUT OUT Pin Name Vs OUT OUT VS Rext GND Pin Function Supply Voltage Regulated Output Current External Resistor for Adjusting Output Current Power Ground Top View Pin-Out Top View Internal Device Schematic Ordering Information (Note 5) Product BCR405UW6Q-7 Notes: Compliance Automotive Marking 405 Reel size (inches) 7 Tape width (mm) 8 Quantity per reel 3,000 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. 4. Automotive products are AEC-Q101 qualified and are PPAP capable 5. For packaging details, go to our website at http://www.diodes.com/products/packages.html. BCR405UW6Q Document number: DS38940 Rev. 1 - 2 1 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Marking Information SOT26 (SC-74) 405 = Part Marking (See Ordering Information) YM = Date Code Marking Y = Year (ex: C = 2016) M = Month (ex: 9 = September) 405 Date Code Key Year Code Month Code 2016 D 2017 E 2018 F 2019 G 2020 H 2021 I 2022 J Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1 2 3 4 5 6 7 8 9 O N D Absolute Maximum Ratings (Voltage relative to GND, @TA = +25C, unless otherwise specified.) Characteristic Symbol Value Unit Supply Voltage VS 40 V Output Current IOUT 100 mA Output Voltage Vout 40 V Reverse voltage between all terminals VR 0.5 V Symbol Value 1,190 912 105 137 Unit Thermal Characteristics Characteristic Power Dissipation Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Lead (Note 6) (Note 7) (Note 6) (Note 7) PD RJA (Note 8) Recommended Operating Junction Temperature Range Maximum Operating Junction and Storage Temperature Range RJL 50 TJ -55 to +150 TJ , TSTG -65 to +150 mW C/W C ESD Ratings (Note 9) Characteristics Electrostatic Discharge - Human Body Model Electrostatic Discharge - Machine Model Notes: Symbols ESD HBM ESD MM Value 800 300 Unit V V JEDEC Class 1B B 6. For a device mounted with the OUT leads on 50mm x 50mm 2oz copper that is on a single-sided 1.6mm FR4 PCB; device is measured under still air conditions while operating in steady-state. 7. Same as Note 5, except mounted on 15mm x 15mm 1oz copper. 8. RJL = Thermal resistance from junction to solder-point (at the end of the OUT leads). 9. Refer to JEDEC specification JESD22-A114 and JESD22-A115. BCR405UW6Q Document number: DS38940 Rev. 1 - 2 2 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Electrical Characteristics Characteristic (@TA = +25C, unless otherwise specified.) Symbol Min Typ Max Unit BVCEO 40 - - V IC = 1mA GND (Enable) Current IGND 340 420 500 A VS = 10V; VOUT = open GND (Enable) Current IGND - 380 - A VS = 10V; VOUT = 8.6V DC Current Gain hFE 100 220 470 - IC = 50mA; VCE = 1V Internal Resistor Rint 13 16.5 22 IRint = 50mA Output Current (nominal) IOUT 45 50 55 mA Voltage Drop (VRext) Vdrop - 0.83 - V IOUT = 50mA Lowest Sufficient Supply Voltage (VSVOUT) VSmin - 1.4 - V IOUT > 18mA IOUT/IOUT - -0.25 - %/C VS = 10V IOUT/IOUT - 1.5 - %/V VS = 10V Collector-Emitter Breakdown Voltage Output Current Change Vs. Temperature Output Current Change Vs. Supply Voltage BCR405UW6Q Document number: DS38940 Rev. 1 - 2 3 of 13 www.diodes.com Test Condition Vout = 8.6V; VS = 10V January 2017 (c) Diodes Incorporated BCR405UW6Q 800 1.4 700 1.2 50mm * 50mm 1oz Cu 1.0 600 500 0.8 400 0.6 300 25mm * 25mm 1oz Cu 0.4 200 0.2 0.0 100 0 0 50 100 100 150 Copper Area (mm ) Derating Curve Rth(JA) VS Cu Area 125 Tamb=25C 100 75 50 50mm * 50mm 1oz Cu D=0.5 Single Pulse D=0.2 D=0.05 25 D=0.1 0 100 1m 10m 100m 1 10 100 1k Single Pulse Tamb=25C 10 50mm * 50mm 1oz Cu 1 100 1m Pulse Width (s) 10m 100m 1 10 100 1k Pulse Width (s) Transient Thermal Impedance Pulse Power Dissipation 150 Tamb=25C 125 Maximum Power (W) Thermal Resistance (C/W) 1000 2 Temperature (C) Maximum Power (W) Thermal Resistance (C/W) (@TA = +25C, unless otherwise specified.) Rth(JA) (C/W) Max Power Dissipation (W) Typical Thermal Characteristics 25mm * 25mm 1oz Cu 100 D=0.5 75 50 D=0.2 Single Pulse D=0.05 25 0 100 D=0.1 1m 10m 100m 1 10 100 1k 100 1m 10m 100m 1 10 100 1k Pulse Width (s) Transient Thermal Impedance Document number: DS38940 Rev. 1 - 2 25mm * 25mm 1oz Cu 1 Pulse Width (s) BCR405UW6Q Single Pulse Tamb=25C 10 Pulse Power Dissipation 4 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Typical Electrical Characteristics (continued) (@TA = +25C, unless otherwise specified.) 80 25C Rext=24 Ohms IOUT (mA) IOUT (mA) 80 60 40 Rext= 82 Ohms Rext=40 Ohms Rext=Open 60 50 40 VS-VOUT=1.4V 20 1 -40C 70 Rext=56 Ohms 5 10 15 20 VS-VOUT=1.4V 25 30 35 150C 30 20 40 40 VS (V) 100 80 VS-VOUT=1.4V Rext=24 Ohms 70 -40C VS=10V 60 IOUT (mA) 60 IOUT (mA) 80 Rext (Ohms)vs IOUT 80 50 Rext=40 Ohms 40 30 Rext= 56 Ohms -25 0 25 Rext=82 Ohms 50 75 85C 25C 20 20 60 Rext (Ohms) VS vs IOUT 40 85C VS=10V 150C VS-VOUT=1.4V Rext= OPEN Rext= OPEN 100 125 0 0 150 TJ (C) 5 10 15 20 25 30 35 40 VS (V) TJ vs IOUT VS vs IOUT 2.0 VS-VOUT=1.4V to 2V 1.8 1.6 60 85C 40 IS (mA) IOUT (mA) 1.4 VS-VOUT=1V 1.2 1.0 0.8 25C 0.6 0.4 0.2 20 0 -40C 5 10 15 20 25 VS (V) 30 35 40 0.0 0 Document number: DS38940 Rev. 1 - 2 10 15 20 25 30 35 40 VS (V) VS vs IOUT BCR405UW6Q 5 VS vs IS 5 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Application Information The BCR401/2/5 are designed for driving low current LEDs with typical LED currents of 10mA to 100mA. They provide a cost-effective way for driving low current LEDs compared with more complex switching regulator solutions. Furthermore, they reduce the PCB board area of the solution as there is no need for external components like inductors, capacitors and switching diodes. Figure 1 shows a typical application circuit diagram for driving an LED or string of LEDs. The devices come with an internal resistor (RINT) of typically 91, 20, 16.5 which in the absence of an external resistor, sets an LED current of 10mA, 20mA, 50mA respectively. LED current can be increased to a desired value by choosing an appropriate external resistor, REXT. The REXT Vs IOUT graphs should be used to select the appropriate resistor. Choosing a low tolerance REXT will improve the overall accuracy of the current sense formed by the parallel connection of RINT and REXT. Figure 1. Typical Application Circuit for BCR40X LED Driver The negative temperature coefficient of the BCR series allows easy paralleling of BCR410/2/5s. In applications where current sharing is required either due to high current requirements of LED strings or for power sharing, two or more BCR401/2/5s can be connected in parallel as shown in Figure 2. Power dissipation capability must be factored into the design, with respect to the BCR401/2/5's thermal resistance. The maximum voltage across the device can be calculated by taking the maximum supply voltage and subtracting the voltage across the LED string. VDEVICE = VS - VOUT PD = (VDEVICE x ILED) + (VS x IGND) As the output current of BCR401/2/5 increases, it is necessary to connect an appropriate heat sink to the OUT pins of the device. The power dissipation supported by the device is dependent upon the PCB board material, the copper area and the ambient temperature. The maximum dissipation the device can handle is given by: PD = (TJ(MAX) - TA) / RJA Figure 2. Application Circuit for Increasing LED Current BCR405UW6Q Document number: DS38940 Rev. 1 - 2 Refer to the thermal characteristic graphs in datasheet for selecting the appropriate PCB copper area. 6 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Application Information (continued) PWM is the most pursued method for LED dimming. In the PWM method, dimming is achieved by turning the LEDs ON and OFF for a portion of a single cycle. PWM dimming can be achieved by enabling/disabling the LED driver itself (refer to Figure 3a ,3b) or by the switching the power path on and off (refer to Figure 3c). The PWM signal can be provided by a micro-controller or analog circuitry; typical circuits are shown in Figure 3. Figure 4 is a typical response of LED current vs. PWM duty cycle, PWM method showed in Figure 3b is used for generating the graphs. Figure 3a Figure 3b Figure 3c Figure 3a, 3b & 3c. Application Circuits for LED Driver with PWM Dimming Functionality BCR405UW6Q Document number: DS38940 Rev. 1 - 2 7 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Application Information (cont.) PWM resolution at 25kHz LED current (mA) 60 50 40 30 calculated DC current 20 Measured DC current 10 0 0 20 40 60 80 100 Duty ratio % PWM resolution at 10kHz LED current (mA) 60 50 40 30 calculated DC current 20 Measured DC current 10 0 0 20 40 60 80 100 Duty ratio % PWM resolution at 1kHz 60 LED current (mA) 50 40 30 calculated DC current 20 Measured DC current 10 0 0 20 40 60 80 100 Duty ratio % Figure: 4 Typical LED Current Response vs. PWM Duty Cycle for 25kHz, 10kHz and 1kHz PWM Frequency (refer to circuit 3b) BCR405UW6Q Document number: DS38940 Rev. 1 - 2 8 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Application Information (cont.) The error between the calculated theoretical value and the measured value is due to the turn on and turn off times of the BCR401/2/5. There will be a small contribution from the switches (a pre-biased transistor or a MOSFET) shown in Figure 3a and 3b towards the total turn on and turn off times of the BCR401/2/5. It is recommended to keep the external switching delays to the lowest possible value to improve PWM accuracy. The typical switching times of the BCR401/2/5 for the configuration shown in Figure 3b are: Turn on time = 200ns Turn off time = 10s Please refer to the Figure 5 and 6 for the switching time performance. The percentage contribution of these switching delays increases with increasing frequency and decreasing duty ratio as can be seen in Figure 4. Figure 5. Turn on time of BCR401/2/5 (PWM method shown in figure 3b) Figure 6. Turn on time of BCR401/2/5 (PWM method shown in figure 3c) However, where possible, the switching performance of the BCR401/2/5 can be significantly improved by switching the power path as shown in Figure 3c. The resulting turn-off time is shown in Figure 7. This resulted in an improved PWM resolution at 25kHz as shown in Figure 8. Turn-off time = ~200ns BCR405UW6Q Document number: DS38940 Rev. 1 - 2 9 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Application Information (cont.) Figure 7. Turn off time of BCR401/2/5 while switching the power path as shown in figure 3c Yellow PWM signal Green LED current Blue No connection made to this probe channel PWM resolution at 25kHz 60 LED current (mA) 50 40 30 calculated DC current 20 Measured DC current 10 0 0 20 40 60 80 100 Duty ratio % Figure 8. PWM resolution with power path switching (refer to figure 3c) BCR405UW6Q Document number: DS38940 Rev. 1 - 2 10 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Application Information (cont.) To remove the potential for incorrect connection of the power supply damaging the lamp's LEDs, many systems use some form of reverse polarity protection. One solution for reverse input polarity protection is to simply use a diode with a low VF in line with the driver/LED combination. The low VF increases the available voltage to the LED stack and dissipates less power. A circuit example is presented in Figure 9 which protects the light engine although it will not function until the problem is diagnosed and corrected. An SDM10U45LP (0.1A/45V) is shown, providing exceptionally low VF for its package size of 1mm x 0.6mm. Other reverse voltage ratings are available from Diodes Incorporated's website such as the SBR02U100LP (0.2A/100V) or SBR0220LP (0.2A/20V). While automotive applications commonly use this method for reverse battery protection, an alternative approach shown in Figure 10, provides reverse polarity protection and corrects the reversed polarity, allowing the light engine to function. The BAS40BRW incorporates four low VF Schottky diodes in a single package, reducing the power dissipated and maximizes the voltage across the LED stack. Figure 9. Application Circuit for LED Driver with Reverse Polarity Protection Figure 10. Application Circuit for LED Driver with Assured Operation Regardless of Polarity BCR405UW6Q Document number: DS38940 Rev. 1 - 2 11 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. SOT26 (SC74R) D E1 SOT26 (SC74R) Dim Min Max Typ A1 0.013 0.10 0.05 A2 1.00 1.30 1.10 A3 0.70 0.80 0.75 b 0.35 0.50 0.38 c 0.10 0.20 0.15 D 2.90 3.10 3.00 e 0.95 e1 1.90 E 2.70 3.00 2.80 E1 1.50 1.70 1.60 L 0.35 0.55 0.40 a 8 a1 7 All Dimensions in mm E b a1 e1 A2 A3 A1 Seating Plane e c L a Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SOT26 (SC74R) C1 Y1 G Dimensions Value (in mm) C 2.40 C1 0.95 G 1.60 X 0.55 Y 0.80 Y1 3.20 C Y X BCR405UW6Q Document number: DS38940 Rev. 1 - 2 12 of 13 www.diodes.com January 2017 (c) Diodes Incorporated BCR405UW6Q IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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