TS19372CX5RF

TS19372 Buck (Step-down) WLED Driver with External Switch SOT-25 Pin Definition: 1. SW 2. Ground 3. CT 4. ISENSE 5. VIN General Description The TS19372 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 300mA output current to drive external N-channel MOSFET. TS19372 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 ● ● ● ● ● ● ● W ide Input Voltage Range 6V~40V Output Current Optional by MOSFET High Efficiency up to 92% 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 ● ● ● ● ● LED Flashlights W hite LED Backlighting W hite LED Driving Multiple LED Driving LED Lighting Equipment Ordering Information Part No. TS19372CX5 RF Package SOT-25 Packing 3Kpcs / 7” Reel Block Diagram 1/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch Absolute Maximum Rating Parameter Input Voltage Supply Voltage (Recommended) FB Voltage SW Voltage Power Dissipation Ambient Temperature Range Junction Temperature Range Symbol VIN VIN VFB VSW PD TA TJ Limit 40 6 ~ 40 -0.3 ~ 40 36 450 -40 to +85 +150 Unit V V V V mW 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 Pin Description Pin 1 2 3 4 5 Function SW Ground Timing Capacitor ISENSE VIN Description Driver Switching 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 Input Voltage Supply pin 2/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch Application Information Inductor Selection A 100uH inductor is recommended for most TS19372 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 TS19372 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 TS19372. Capacitor Selection For Input capacitor and timing capacitor are able to use small ceramic capacitor for most of TS19372 applications. When AC input, to add a 100µF electric capacitor for input capacitor is recommended. 3/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch Typical Application Circuit (DC Input) Input Voltage vs. Efficiency Reference Design Information: TS19372CX5 + TSM2318CX VIN Range (V) 12 24 VIN Range (V) 12 12 12 24 24 24 L (uH) 68 100 LED (Series) 3pcs 6pcs 1W LED (Series) 3pcs 2pcs 2pcs 6pcs 6pcs 6pcs LED (W) 1 1 Current (mA) 350 350 Current (mA) 700 1000 1400 700 1000 1400 R1 (ohm) 0.54 0.54 R2 (ohm) 1k 1k Efficiency (%) 88 92 Efficiency (%) 88 88 86 92 92 90 TS19372CX5 + TSM4436CS L (uH) 68 68 68 100 100 100 LED (W) 3 5 5 3 5 5 R1 (ohm) 0.32 0.22 0.1 0.16 0.11 0.03 R2 (ohm) 1k 1k 1k 1k 1k 1k Bill of Materials: Designation LED Driver D1 M1 Cin C1 Description TS19372CX5 SK34A TSM2318CX TSM4436CS 10uF 820pF Package SOT-25 SMA SOT-23 SOP-8 805 805 Manufacture TSC TSC TSC TSC Generic Generic Remark -3A, 40V N-CH 40V / 3.9A N-CH 60V / 8A Ceramic Ceramic 4/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch Typical Application Circuit (AC Input) Input Voltage vs. Efficiency Reference Design Information: TS19372CX5 + TSM2318CX VIN Range (V) 12 24 VIN Range (V) 12 12 12 24 24 24 L (uH) 68 100 LED (Series) 3pcs 6pcs 1W LED (Series) 3pcs 2pcs 2pcs 6pcs 6pcs 6pcs LED (W) 1 1 Current (mA) 350 350 Current (mA) 700 1000 1400 700 1000 1400 R1 (ohm) 0.54 0.54 R2 (ohm) 1k 1k Efficiency (%) 88 92 Efficiency (%) 88 88 86 92 92 90 TS19372CX5 + TSM4436CS L (uH) 68 68 68 100 100 100 LED (W) 3 5 5 3 5 5 R1 (ohm) 0.32 0.22 0.1 0.16 0.11 0.03 R2 (ohm) 1k 1k 1k 1k 1k 1k Bill of Materials: Designation LED Driver D1 D2.3.4 M1 Cin C1 Description TS19372CX5 SK34A SS23M TSM2318CX TSM4436CS 10uF 820pF Package SOT-25 SMA uSMA SOT-23 SOP-8 805 805 Manufacture TSC TSC TSC TSC TSC Generic Generic Remark -3A, 40V 2A, 30V N-CH 40V / 3.9A N-CH 60V / 8A Ceramic Ceramic 5/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch Typical Application Circuit – Buck Dimming Control Circuit 1W LED 3S1P Bill of Materials: Designation LED Driver D1 M1. M2 M3 L1 R1 R2, R3 R4, R5, R6 C1 C2 Description TS19372CX5 SK34A TSM2N7002KCX TSM2318CX 100uH 0.1 1k 10k 10uF 820pF Package SOT-25 SMA SOT-23 SOT-23 -1206 1206 1206 805 805 Manufacture TSC TSC TSC TSC Generic Generic Generic Generic Generic Generic Remark -3A, 40V N-CH 40V / 3.9A Isat >1.5A --Ceramic Ceramic 6/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch Typical Application Circuit – Buck ON/OFF Control Circuit 1W LED 3S1P Bill of Materials: Designation LED Driver D1 M1 M2 L1 R1 R2, R3 R4 C1 C2 Description TS19372CX5 SK34A TSM2N7002KCX TSM2318CX 100uH 0.1 1k 10k 820pF 100uF Package SOT-25 SMA SOT-23 SOT-23 -1206 1206 1206 805 Manufacture TSC TSC TSC TSC Generic Generic Generic Generic Generic Generic Remark -3A, 40V N-CH 40V / 3.9A Isat >1.5A --Ceramic Tantalum or Electrolysis * AC Input 7/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch 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 72 = Devi e 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 8/9 Version: D09 TS19372 Buck (Step-down) WLED Driver with External Switch 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. 9/9 Version: D09