TS19451

TS19451 AC/DC WLED Driver with Internal MOSFET Universal Switch Mode SOT-89 Pin Definition: 1. Drain 2. GND 3. VDD General Description The TS19451 is a PWM high efficiency LED driver control IC. It allows efficient operation of LED strings from voltage source ranging up to 400VDC. It includes an internal high voltage switching MOSFET controlled with fixed off-time of approximately 10.5µS. The LED string is driven at constant current, thus providing constant light output and enhanced reliability. The output current is internally fixed at 50mA. The peak current control scheme provides good regulation of the output current throughout the universal AC line voltage range of 85~264VAC or DC input voltage of 20~400V Features ● ● ● ● Constant output current at 50mA Universal 85~264VAC operation Fixed off-time buck converter Internal 475V power MOSFET Typical Application Circuit Application ● ● ● Decorating LED lighting Lower power lighting fixtures Back light of flat panel displays Ordering Information Part No. TS19451CY RMG Package SOT-89 Packing 1Kpcs / 7” Reel Note: “G” denotes for Halogen Free Absolute Maximum Rating Parameter Input Voltage Range Supply Current Power Dissipation @ TA=25ºC Operating Ambient Temperature Storage Temperature Range Junction Temperature Range Thermal Resistance – Junction to Ambient Symbol VIN to GND IDD PD TOPR TSTG TJ RθJA Limit ~ +475 5 1300 -40 to +85 -65 to +150 -40 to +150 128 Unit V mA mW ºC o o o C C C/W Note: Stresses beyond those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. These are stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 1/7 Version: B11 TS19451 AC/DC WLED Driver with Internal MOSFET Universal Switch Mode Electrical Specifications (Ta = 25oC, VDRAIN= 50V, unless otherwise noted) Function Parameter Internal Regulator Internally Regulated Voltage Drain Supply Voltage Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Supply Current Output (Drain) Breakdown Voltage On Resistance Output Capacitance MOSFET Saturation current Current Sense Comparator Threshold Current Leading edge Blanking delay Minimum Turn On-Time Off-Time Generator Turn On-Time TOFF 8 10.5 13 µS ITH TBLANK TON(MIN) 49 200 --300 -63 400 650 mA nS nS VBR RDSON CDRAIN ISAT IDRAIN=50mA VDRAIN=400V 475 --100 --1.0 150 -210 5.0 -pF mA V VDD VDRAIN UVLO ∆UVLO IDD VDD(EXT)=8.5V, VDRAIN=40V --4.0 --7.5 20 -200 200 ----350 V V V mV µA Symbol Test Conditions Min Typ Max Units Note 1: The specification which apply over the full operating ambient temperature range of -40ºC