TSCR402CX6 RFG

TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor Linear Constant Current Regulated LED Driver DESCRIPTION FEATURES The TSCR400 & TSCR402 are High-Side Constant ● LED drive current preset: Current Regulator (CCR) for linear LED driving. The device regulates with a preset TSCR400 0.1mA and ● TSCR400CX6: 0.1mA ● TSCR402CX6: 20mA ● Continuous output current up to 65mA with an TSCR402 20mA nominal that can be adjusted with an external resistor up to 65mA. It is designed for driving external resistor LEDs in strings and will reduce current at increasing ● Easy paralleling of drivers to increase current temperatures to self-protect. Operating as a series ● Supply voltage up to 40V linear CCR for LED string current control, it can be ● Good temperature coefficient vs. output current used in multiple applications, as long as the maximum ● Compliant to RoHS Directive 2011/65/EU and in supply voltage to the device is 85µA Battery Voltage TSCR402 IOUT>18mA Output Current vs. Temperature TSCR400 VS=3V TSCR402 VS=10V Output Current vs. Supply Voltage TSCR400 VS=3V TSCR402 VS=10V Supply Current Internal Resistor Output Current SYMBOL MIN TYP MAX UNIT VBR 40 -- -- V -- 60 -- µA -- 150 -- µA 5.85 6.5 7.15 kΩ 38 44 52 Ω 0.085 0.1 0.115 18 20 22 -- 0.65 -- -- 0.85 -- -- 1.6 -- -- 1.4 -- -- -0.07 -- -- -0.07 -- -- 0.33 -- -- 0.33 -- IS RINT IOUT VDROP VSmin ΔIOUT/IOUT ΔIOUT/IOUT 2 mA V V %/°C %/V Version: B1708 TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor ORDERING INFORMATION PART NO. PACKAGE PACKING TSCR400CX6 RFG SOT-26 3,000pcs / 7”Reel TSCR402CX6 RFG SOT-26 3,000pcs / 7”Reel FUNCTION BLOCK VS Vref RINT REXT Regulator VBG TSCR402 TSCR400 GND OUT PIN DESCRIPTION PIN NO. NAME FUNCTION 1 GND Power ground 2 OUT Regulated output current 3 OUT Regulated output current 4 VS 5 OUT Regulated output current 6 REXT External resistor for adjusting output current Supply voltage 3 Version: B1708 TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor TSCR400CX6 CHARACTERISTICS CURVES 1.2 100 REXT = 710Ω IOUT (mA) IOUT (mA) 1.1 10 1 1 0.9 0.8 0 0 0 1 10 -40 100 0 20 40 60 80 TA (℃) Figure 2. IOUT vs. TA (REXT=710Ω) REXT (kΩ) Figure 1. IOUT vs. REXT 0.75 1,000 0.7 100 IC (mA) VDROP (V) -20 0.65 0.6 10 1 0.55 0 0 1 10 100 1,000 1 10 100 1,000 IC (mA) Figure 3. VDROP vs IC REXT (Ω) Figure 4. VEN vs IOUT (REXT=open) VDROP = f(IC) refer to stabilized NPN Transistor Collector Current IC = f(REXT) refer to stabilized NPN Transistor 1.2 1,000 Power Dissipation (W) 2.1Ω 5.3Ω IC (mA) 100 13Ω 69Ω 10 750Ω 1 4.3kΩ 2 4 6 8 0.8 0.6 0.4 0.2 0 0 0 1 0 10 20 40 60 80 100 120 140 160 Ambient Temperature (℃) Figure 6. PD vs. Ambient Temperature Vs(V) Figure 5. IC vs. VS (Parameter REXT=(Ω)) Collector Current IC = f(VS) refer to stabilized NPN Transistor 4 Version: B1708 TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor TSCR402CX6 CHARACTERISTICS CURVES 300 25 25℃ REXT = OPEN 20 VS-VOUT = 1.4V to 2V 200 IS (mA) 15 IOUT (mA) 85℃ 250 VS-VOUT = 1V 10 150 -40℃ 100 5 50 0 0 10 20 30 0 40 0 VS (V) 10 20 30 40 VS (V) Figure 8. VS vs. IS (REXT=OPEN) Figure 7. VS vs. IOUT 100 1 REXT = OPEN 25℃ 25℃ -40℃ -40℃ 0.9 IOUT (mA) VDROP (V) 0.95 0.85 85℃ 85℃ 0.8 REXT= 24 ohm REXT= 75 ohm REXT= OPEN 10 0.75 0.7 10 20 30 40 50 60 70 1 80 0 IOUT (mA) Figure 9. IOUT vs. VDROP (REXT=OPEN) 10 20 VS (V) Figure 10. VS vs. IOUT 30 40 1.2 IOUT (mA) Power Dissipation (W) 100 10 1 0.8 0.6 0.4 0.2 0 10 100 0 REXT (Ω) 20 40 60 80 100 120 140 160 Ambient Temperature (℃) Figure 12. PD vs. Ambient Temperature Figure 11. REXT vs. IOUT 5 Version: B1708 TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor APPLICATION INFORMATION The TSCR400 & TSCR402 are designed for driving low current LEDs with typical LED currents of 0.1mA to 65mA. 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 13 shows circuit diagram for stand along application an external resistor REXT can be connected to adjust the current. The device comes with an internal resistor (RINT) of typically 6.5kΩ and 44Ω which in the absence of an external resistor, sets an LED current of 0.1mA (typical) for TSCR400 and 20mA (typical) for TSCR402. LED current can be increased to a desired value by choosing an appropriate external resistor, R EXT. REXT = VDROP / (IOUT – (VDROP/RINT)) Figure 14 shows boost mode configuration of LED current can be extended to drive high power LEDs The REXT vs ILED graphs should be used to select the appropriate resistor. Choosing a low tolerance R EXT will improve the overall accuracy of the current sense formed by the parallel connection of R INT and REXT. REXT = VDROP / (ILED – (VDROP/RINT)) Consideration of the expected linear mode power dissipation must be factored into the design, with respect to the TSCR400 & TSCR402’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 – VLED PD = (VDEVICE × ILED) + (VS × IGND) As the output current of TSCR400 & TSCR402 increases, it is necessary to provide appropriate thermal relief to 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) / RθJA Vs Supply Vs Supply Vref RINT Vref (Optional) RINT REXT REXT Regulator (Optional) REXT VBG Regulator VBG LED String TSCR400 TSCR402 GND OUT TSCR400 TSCR402 IOUT GND OUT ILED R1 LED String R2 Figure 13: Application circuit for Stand along Figure 14: Application Circuit for Boost mode current source current source with external power transistor 6 Version: B1708 TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) SOT-26 SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM Px = Device Code P1 =TSCR400CX6 P2 =TSCR402CX6 Y = Year Code M = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr S =May T =Jun U =Jul V =Aug W =Sep X =Oct Y =Nov Z =Dec L = Lot Code (1~9, A~Z) 7 Version: B1708 TSCR400CX6 / TSCR402CX6 Taiwan Semiconductor Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. 8 Version: B1708