TS19450

TS19450 AC/DC WLED Driver with External MOSFET Universal High Brightness SOP-8 Pin Definition: 1. VIN 8. RT 2. CS 7. LD 3. GND 6. VDD 4. Gate 5. PWMD General Description The TS19450 is an open loop, current mode control LED driver IC. It can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8V~450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The TS19450 includes a PWM dimming input that can accept an external control signal with a duty ratio of 0~100% and a frequency of up to a few kHz. It also includes a 0~250mV linear dimming input which can be used for linear dimming of the LED current. The TS19450 is ideally suited for buck LED drivers. Since it operates in open loop current mode control, the controller achieves good output current regulation without the need for any loop compensation. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times. The TS19450 requires only free external components (apart from the power stage) to produce a controlled LED current making it and ideal solution for low cost LED drivers. Features ● ● ● ● ● ● Switch mode controller for single switch LED drivers Open loop peak current controller Internal 8V~450V linear regulator Constant frequency or constant off-time operation Linear and PWM dimming capability Requires few external components for operation Ordering Information Part No. TS19450CS RL Package SOP-8 Packing 2.5Kpcs / 13” Reel Typical Application Circuit Application ● ● ● ● ● ● DC/DC or AC/DC LED driver applications RGB backlighting LED driver Back lighting of flat panel displays General purpose constant current source Signage and decorative LED lighting Charger Absolute Maximum Rating Parameter Input Voltage Range Internal Regulated Voltage CS, LD, PWMD, Gate, RT to GND Continuous Power Dissipation Storage Temperature Range Junction Temperature Range Thermal Resistance – Junction to Ambient 1 /8 PD TA TJ RθJA Symbol VIN to GND VDD to GND Limit -0.5 ~ +470 13.5 -0.3 ~ (VDD+0.3) 630 -65 to +150 -40 to +150 128 Unit V V V mW o o o C C C/W Version: A10 TS19450 AC/DC WLED Driver with External MOSFET Universal High Brightness Electrical Specifications (TA= 25oC, VIN= 12V, unless otherwise noted) Function Parameter Input DC Input Voltage Range Shut-down Mode Supply Current Internal Regulator Internally Regulated Voltage Line Regulation of VDD Load Regulation of VDD Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis VDD current available for external circuitry Dimming PWMD Input Low Voltage PWMD Input High Voltage PWMD Pull-down resistance at PWMD Linear Dimming pin voltage Current Sense Comparator Current Sense Pull-in Threshold Voltage Offset Voltage for LD Comparator Current Sense Blanking Interval Delay to Output Oscillator Oscillator Frequency Max. Oscillator PWM Duty Cycle Gate Driver Gate Sourcing Current Gate Sinking Current Gate high output voltage Gate low output voltage Gate output Rise Time Gate Output Fall Time ISOURCE ISINK VGATE(HI) VGATE(LO) TRISE TFALL VGATE=0V, VDD=7.5V VGATE=VDD, VDD=7.5V IOUT=-10mA IOUT=10mA CGATE=500pF, 10%~90% VGATE CGATE=500pF, 90%~10% VGATE 165 165 VDD0.3 0 ------30 30 --VDD 0.3 50 50 mA mA V V nS nS fOSC DMAX RT=1MΩ RT=223kΩ F=25kHz at Gate, CS to GND 20 80 -25 100 -30 120 100 kHz % VCSTH VOFFSET TBLANK TDELAY VLD=VDD , VCS=0.55VLD VIN=12V, VLD=0.15V, VCS=0~0.22V after TBLANK -40ºC < TA < +85ºC TA < +125ºC 225 213 -12 150 -250 250 -215 -275 287 12 280 300 mV mV nS nS Symbol VINDC IINSD VDD ∆VDDLine ∆VDDLoad UVLO ∆UVLO VDD (EXT) VENL VENH REN VLD Test Conditions DC input voltage Pin PWMD to GND VIN=8V, IDD(EXT)=0, 500pF at Gate, RT=226kΩ, PWMD=VDD VIN=8~450V, IDD(EXT)=0, 500pF at Gate, RT=226kΩ, PWMD=VDD IDD(EXT)=0~1mA, 500pF at Gate, RT=226kΩ, PWMD=VDD VDD rising VDD falling VIN=8V~100V VIN=8V~450V VIN=8V~450V VPWMD=5V VIN=12V Min 8.0 -7.0 0 0 6.45 ---2.4 50 0 Typ -0.5 7 .5 --6.7 500 ---100 -- Max 450 1.0 8.0 1.0 100 6.95 -1.0 1.0 -150 250 Units V mA V V mV V mV mA V V kΩ mV Note 1: Limited by package power dissipation, whichever is lower Note 2: VDD load current external to the TS19450 Note 3: Denotes the specifications which apply over the full operating ambient temperature range of -40ºC