TS19375CS RLG

TS19375 PWM Step-Up Controller SOP-8 Pin Definition: 1. EN 8. NC 2. Vcc 7. GND 3. FB 6. Gate 4. SS 5. Sense General Description The TS19375 is high efficient PWM step-up controller. Designed to drive an external N-channel MOSFET, Output voltage is programmable with 1.0V of standard voltage supply internal, and using externally connected components, output voltage (FB) can be set up at will. The TS19375 can be operated at switching frequencies of 500kHz allowing for easy filtering and low noise, the size of the external components can be reduced. An enable function and thermal shutdown functions are built inside. The soft-start time can be programmed by outside capacitor; the function prevents overshoot at startup. Features Ordering Information ● Input voltage range 3V ~ 24V ● Output voltage: Define by N-CH MOSFET ● Duty ratio: 0% ~ 85% PWM control ● Oscillation frequency: 500kHz ● Soft-start time programmed by external capacitor Application ● Thermal shutdown protection ● LED Panel Display Backlighting ● Internal current limit ● PDA and Portable Media Players ● External SW N-CH MOSFET ● Local Boost Regulator Part No. TS19375CS RLG Package SOP-8 Packing 2.5Kpcs / 13” Reel Note: “G” denotes for Halogen Free Typical Application Circuit VOUT=VFB x (1+R1/R2), VFB=1V, R2=1k~3k C4 Capacitor ESR suggest 30mΩ ~ 100mΩ 1/8 Version: C12 TS19375 PWM Step-Up Controller Absolute Maximum Rating Characteristics Symbol Rating Unit VCC VFB VEN VSENSE VSS VGATE PD TSTG TOPJ VOP θJC θJA VSS - 0.3 to VSS + 26 VSS - 0.3 to 12 VSS - 0.3 to VCC VSS - 0.3 to VCC VSS - 0.3 to VCC VSS - 0.3 to VCC Internally limited -40 to +150 -20 to +125 +3 to +24 40 120 V V V V V V mW ºC ºC V ºC/W ºC/W VCC Pin Voltage Feedback Pin Voltage EN Voltage SENSE Voltage SS Pin Voltage Gate Pin Voltage Power Dissipation Storage Temperature Range Operating Junction Temperature Range Operating Supply Voltage Thermal Resistance from Junction to case Thermal Resistance from Junction to ambient Note: Stresses exceed those rating may damage the device Electrical Specifications (TA=25oC, VIN=5V, VOUT=12V unless otherwise noted) Characteristics Symbol Conditions Min Typ Max Units Feedback Voltage VFB IOUT=0.1A Quiescent Current ICCQ VFB=1.5V force driver off - 4 6 mA 0.975 1.000 1.025 V Feedback Bias Current IFB IOUT=0.1A - 0.1 0.5 uA Shutdown Supply Current ISD VEN =0V - 1 10 uA FOSC SW pin 400 500 600 KHz 0.05 0.06 0.07 V - 8 - uA Oscillation Frequency Sense Voltage Soft Start Current EN Pin Logic input threshold voltage EN Pin Input Current VSENSE ISS VSS=0V VSH High (regulator ON) 2.0 - - VSL Low (regulator OFF) - - 0.8 ISH VEN=2.5V (ON) - 20 - uA ISL VEN=0.3V (OFF) - -1 - uA LX Rise Time TLXR CLX=1000pF - 60 - LX Fall Time TLXF CLX=1000pF - 60 - Efficiency EFFI VCC = 5V, VOUT = 12V - 91 - IOUT = 1A Maximum Duty Cycle DCMAX VFB=0V - 85 - Minimum Duty Cycle DCMIN VFB=1.5V - 0 - - 145 - Thermal shutdown Temp TSD 2/8 V nS % % °C Version: C12 TS19375 PWM Step-Up Controller Block Diagram Vcc Phase Compensation FB Regulator + + - Vref=1.0V Buffer Driver PWM Controller EN Oscillator 8uA VEN GATE GND Thermal Shutdown 0.06V SS SENSE Pin Function Description Pin NO. Pin Name Pin Description 1 EN Shutdown Control Input H: Normal Operation L: Shutdown Mode 2 VCC VCC Supply pin 3 FB Feedback Pin 4 SS Soft-Start pin 5 VSENSE 6 Gate Gate drive for external N-CH MOSFET 7 GND Signal Ground Pin 8 NC Current Limit Sense Voltage Non Connect 3/8 Version: C12 TS19375 PWM Step-Up Controller Function Description PWM Control The TS19375 is high efficient PWM step-up controller, the pulse width varies in a range from 0 to 85%. 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, TS19375 provide a low-ripple power over broad ranges of input voltage and load current. Setting the Output Voltage Application circuit shows the basic application circuit with adjustable output version. The external resistor sets the output voltage according to the following formula: Table 1: Resistor select for output voltage setting VOUT R2 R1 12V 1K 11K 15V 1.5K 21K 18V 1K 17K 24V 1.3K 30K Current Limit Setting The current limit threshold is setting by the external resistor (RSENSE) connecting from SENSE pin to GND (refer the application circuit). The internal current limit compared voltage is 60mV. When the SENSE voltage is larger than 60mV, an over-current condition is triggered. Please refer to the formula for setting the minimum current limit value: Note: ISW(MAX) is the maximum N-MOSFET current Inductor Selection For most designs, Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following formula: Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 15% of the maximum input current 3A, ∆IL=0.45A. Table 2: Inductor select for output voltage setting (VCC=5V) VOUT 9V 12V 15V 18V L1 Value 18uH 15uH 10uH 10uH The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (3A+0.25A). 4/8 Version: C12 TS19375 PWM Step-Up Controller Function Description (Continue) Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed to satisfy. Output Capacitor Selection The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The output capacitor must have low impedance at the switching frequency. A low ESR capacitor sized for maximum RMS current must be used. The low ESR requirements needed for low output ripple voltage. The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed to satisfy. The ESR range of output capacitor is 30m~100mΩ at switch current more than 1.5A. Add a 4.7uF output bypass capacitor in order to reduce output ripple effectively 5/8 Version: C12 TS19375 PWM Step-Up Controller Electrical Characteristics Curve (TA=25ºC, VIN=5V, VFORWARD-LED=3.3V, unless otherwise noted) Input Voltage vs. Output Voltage Output Current vs. Output Voltage Shutdown Current vs. Temperature Feedback Voltage vs. Temperature 6/8 Version: C12 TS19375 PWM Step-Up Controller 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 7/8 Version: C12 TS19375 PWM Step-Up Controller 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. 8/8 Version: C12