TS19373

TS19373 800mA Buck (Step-down) WLED Driver SOT-25 Pin Definition: 1. VIN 2. Ground 3. CT 4. ISENSE 5. SW General Description The TS19373 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 800mA. TS19373 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Features ● ● ● ● ● ● ● Wide Input Voltage Range 6V~40V 800mA Output Current High Efficiency up to 90% Drives up to 3 (1~3W) LEDs @ VIN 12V Drives up to 7 (1~3W) LEDs @ VIN 24V 180kHz Switching Frequency Internal PWM Filter Application ● ● ● ● ● DC/DC or AC/DC LED driver applications Back lighting of flat panel displays Signage and decorative LED lightings Chargers LED Lighting Equipment – MR16, Tube Ordering Information Part No. TS19373CX5 RF Package SOT-25 Packing 3Kpcs / 7” Reel Block Diagram 1 /7 Version: A09 TS19373 800mA Buck (Step-down) WLED Driver Absolute Maximum Rating Parameter Input Voltage Supply Voltage (Recommended) FB Voltage SW Voltage Output SW Current Ambient Temperature Range Junction Temperature Range Symbol VIN VIN VFB VSW ISW TA TJ Limit 40 6 ~ 40 -0.3 ~ 40 36 800 -40 to +85 +150 Unit V V V V mA o o C C Electrical Specifications (Ta = 25oC, unless otherwise noted) Parameter Input Voltage Range Line Regulation Charge Current Discharge Current Switching Frequency Current Limit Sense Voltage Switch VCESAT Supply Current Collector off-state Current Symbol VIN REGLINE ICHARGE IDISCHARGE FOSC VSENSE VSAT ICC IC(OFF) Test Conditions Min 6 -- Typ -1.4 30 230 180 -1.0 3 1 Max 40 5 45 290 -350 1.3 4 100 Units V mV uA uA kHz mV V mA uA VIN =6V~40V VIN =6V~40V CT =100pF, IDISCHARGE = ICHARGE ISW = 300mA VIN =6V~40V, CT =1nF VCE =40V -180 -250 --- Note: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible 2 /7 Version: A09 TS19373 800mA Buck (Step-down) WLED Driver Application Information Pin Description Pin 1 2 3 4 5 Function VIN Ground Timing Capacitor ISENSE SW Description Input Voltage Supply pin Ground Pin Timing capacitor oscillator input Peak current sense input to monitor the voltage drop across an external resistor to limit the peak current through the circuit Switching Pin. This is the internal Darlington switch collector Inductor Selection A 100uH inductor is recommended for most TS19373 applications. Although small size and high efficiency are major concerns, the inductor should have low core losses at 180kHz and low DCR (copper wire resistance). Diode Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for TS19373 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode while the diode capacitance represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 180kHz switching frequency of the TS19373. Capacitor Selection For Input capacitor and timing capacitor are able to use small ceramic capacitor for most of TS19373 applications. When AC input, to add a 100µF electric capacitor for input capacitor is recommended. 3 /7 Version: A09 TS19373 800mA Buck (Step-down) WLED Driver Typical Application Circuit Input Voltage vs. Efficiency Reference Design Information VIN Range (V) 12 24 L (uH) 68 100 LED (Series) 3pcs 7pcs Current (mA) 300 300 Efficiency (%) 89 90 Typical Application Circuit – LED Tube Bill of Materials: Designation LED Driver D1,2,3,4,5 L1 R1 Cin C1 C2 Description TS19373CX5 SS14L 100uH 0.5Ω 10uF 200pF 100uF Package SOT-25 SM A -1206 805 805 Manufacture TSC TSC Generic Generic Generic Generic Generic Remark -1A, 40V Isat > 500mA -Ceramic Ceramic Tantalum or Electrolysis * AC Input 4 /7 Version: A09 TS19373 800mA Buck (Step-down) WLED Driver Typical Application Circuit – MR16 Bill of Materials: Designation LED Driver D1,2,3,4,5 L1 R1 Cin C1 C2 Description TS19373CX5 SS14L 100uH 0.5Ω 10uF 200pF 100uF Package SOT-25 SM A -1206 805 805 Manufacture TSC TSC Generic Generic Generic Generic Generic Remark -1A, 40V Isat > 500mA -Ceramic Ceramic Tantalum or Electrolysis * AC Input 5 /7 Version: A09 TS19373 800mA Buck (Step-down) WLED Driver SOT-25 Mechanical Drawing DIM A+A1 B C D E e H L Ө1 S1 SOT-25 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 0.09 1.25 0.0354 0.0492 0.30 0.50 0.0118 0.0197 0.09 0.25 0.0035 0.0098 2.70 3.10 0.1063 0.1220 1.40 1.80 0.0551 0.0709 1.90 BSC 0.0748 BSC 2.40 3.00 0.09449 0.1181 0.35 BSC 0.0138 BSC 0º 10º 0º 10º 0.95 BSC 0.0374 BSC Marking Diagram 73 = Device Code Y = Year Code M = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) L = Lot Code 6 /7 Version: A09 TS19373 800mA Buck (Step-down) WLED Driver 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. 7 /7 Version: A09