TS19377CSRLG

TS19377 2A Buck (Step-down) WLED Driver SOP-8 Pin Definition: 1. FB 8. GND 2. EN 7. GND 3. Comp 6. SW 4. Vcc 5. SW General Description TS19377 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. TS19377 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8 package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. Features ● ● ● ● ● ● ● ● ● Input Voltage Range 3.6V~23V Output voltage: 0.25V~Vcc 2A Switch Output Current Duty ratio: 0%~100% PWM control 330kHz Switching Frequency Enable/Disable Functions Current limit and Thermal Shutdown Short Circuit Protections Built-in Internal SW P-CH MOS Application ● ● ● ● W hite LED Backlighting W hite LED Driving Multiple LED Driving LED Lighting Equipment Ordering Information Part No. TS19377CS RLG Package SOP-8 Packing 2.5Kpcs / 13” Reel Note: “G” denotes Halogen Free Product. Block Diagram SW Oscillator Circuit Reference Voltage + FB Vss Vcc PWMSwitched Control Circuit Thermal Shutdown VEN Current Limit EN Comp 1/7 Version: A11 TS19377 2A Buck (Step-down) WLED Driver Absolute Maximum Rating Parameter VCC Pin Voltage Feedback Pin Voltage ON/OFF Pin Voltage Switch Pin Voltage Power Dissipation Storage Temperature Range Operating Temperature Range Operating Supply Voltage Thermal Resistance from Junction to case Symbol VCC VFB VEN VSW PD TST TOP VOP θJC Limit VSS - 0.3 to VSS + 25 VSS - 0.3 to VCC VSS - 0.3 to VCC + 0.3 VSS - 0.3 to VCC + 0.3 Internally limited -40 to +150 -40 to +125 +3.6 to +23 25 Unit V V V V mW ° C ° C V ° C/W Electrical Specifications (VIN=12V, TA =25oC, unless otherwise noted) Parameter Feedback Voltage Quiescent Current Feedback Bias Current Shutdown Supply Current Switch Current Line Regulation Load Regulation Oscillation Frequency EN Pin Logic input threshold voltage EN Pin Input Current Internal MOSFET RDSON Efficiency Thermal shutdown Temp Symbol VFB ICCQ IFB ISD ISW △VOUT/VOUT △VOUT/VOUT FOSC VSH VSL ISH ISL RDSON EFFI TSD Conditions IOUT=0.2A VFB=1.2V force driver off IOUT=0.1A VEN =0V VCC=5V~23V, IOUT=0.2A IOUT=0.1 to 2A High (regulator ON) Low (regulator OFF) VEN=2.5V (ON) VEN=0.3V (OFF) VCC=5V, VFB=0V VCC=12V, VFB=0V VOUT = 5V IOUT=1A IOUT=2A Min 0.24 ---2.5 --260 2.0 --------- Typ 0.25 3 0.1 2 -1 0.2 330 --20 -10 100 70 91 91 140 Max 0.26 5 0.5 10 -2 0.5 400 -0.8 --140 100 ---- Units V mA uA uA A % % KHz V uA uA m % ° C 2/7 Version: A11 TS19377 2A Buck (Step-down) WLED Driver Typical Application Circuit A: 1W/3W LED*1 for DC Input U1 VCC R1 100K 1 2 FB VSS 8 VOUT L1 22uH (10uH for AX2002A) EN 3 COMP 4 VCC AX2002/A D6 7 VSS SW 6 5 SW D7 LED 1N4148 R4 4.7K Option D5 B240A C1 4.7u C2 22u C3 0.1u C4 1u R5 100K R2 0.75R/0.33R 1W/3W Recommend Bill of Material: ILED 350mA 750mA 1000mA 0.715 0.333 0.250 R2 87.5mW 189mW 250mW C2 100uF 220uF 330uF R5 0.22K 0.47K 0.47K 68uH L1 B: 1W/3W LED*1 for AC Input No output Capacitor U1 1 2 AC 12V IN AC D4 AC D3 AC D2 AC D1 R5 R2 FB VSS 8 VOUT L1 D2 LED 7 VSS SW 6 5 SW EN 3 COMP 4 VCC AX2002/A C3 C2 0.1u C5 100nF D5 B240A ILED 350mA 750mA 1000mA R2 0.715 0.333 0.250 87.5mW 189mW 250mW C2 100uF 220uF 330uF R5 0.22K 0.47K 0.47K L1 68uH 3/7 Version: A11 TS19377 2A Buck (Step-down) WLED Driver Function Descriptions PWM Control The TS19377 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the TS19377, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Setting ILED Current Application circuit item shows the basic application circuit with TS19377 adjustable output version. The external resistor sets the LED output current according to the following formula: ILED=(0.25V/R2) Resistor select for LED output current setting ILED 350mA 750mA 1000mA 0.715 0.333 0.250 R2 87.5mW 189mW 250mW RDS(ON) Current Liming The current limit threshold is setting by the internal circuit. Compensation Please refer the table of application circuit. For DC input, the option circuit for compensation is connecting R4 and a 1N4148 diode to VOUT. In order to protect short circuit and thermal shutdown release for LED. 4/7 Version: A11 TS19377 2A Buck (Step-down) WLED Driver Electrical Characteristics Curve Figure 1. Quiescent Current vs. Temperature Figure 2. Shutdown Current vs. Temperature Figure 3. Feedback Voltage vs. Temperature Figure 4. Feedback Voltage vs. Input Voltage Figure 5. Frequency vs. Temperature Figure 6. Efficiency vs. Output Current 5/7 Version: A11 TS19377 2A Buck (Step-down) WLED Driver SOP-8 Mechanical Drawing DIM A B C D F G K M P R SOP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0º 7º 0º 7º 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019 Marking Diagram Y = Year Code M = Month Code for Halogen Free Product (O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep, X=Oct, Y=Nov, Z=Dec) L = Lot Code 6/7 Version: A11 TS19377 2A 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: A11