TS19451CY RMG

TS19451 AC/DC WLED Driver with Internal MOSFET Universal Switch Mode SOT-89 Pin Definition: 1. Drain 2. GND 3. VDD General Description en de d 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 Typical Application Circuit ● Constant output current at 50mA ● Universal 85~264VAC operation ● Fixed off-time buck converter ● Internal 475V power MOSFET Application ● Decorating LED lighting ● Lower power lighting fixtures ● Back light of flat panel displays eco Ordering Information mm Features Part No. Package Packing TS19451CY RMG SOT-89 1Kpcs / 7” Reel tR Note: “G” denotes for Halogen Free Absolute Maximum Rating Parameter Symbol Limit Unit VIN to GND ~ +475 V Supply Current IDD 5 mA Power Dissipation @ TA=25ºC PD 1300 mW Operating Ambient Temperature TOPR -40 to +85 ºC Storage Temperature Range TSTG -65 to +150 o -40 to +150 o No Input Voltage Range Junction Temperature Range TJ Thermal Resistance – Junction to Ambient RθJA 128 C C o 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 Symbol Test Conditions Min Typ Max Units VDD -- 7.5 -- V Drain Supply Voltage VDRAIN -- 20 -- V Undervoltage Lockout Threshold UVLO 4.0 -- -- V Undervoltage Lockout Hysteresis ∆UVLO -- 200 -- mV -- 200 350 µA Internal Regulator Supply Current IDD VDD(EXT)=8.5V, VDRAIN=40V d Internally Regulated Voltage Breakdown Voltage VBR RDSON IDRAIN=50mA Output Capacitance CDRAIN VDRAIN=400V MOSFET Saturation current ISAT Current Sense Comparator ITH mm Threshold Current -- -- V -- -- 210 Ω -- 1.0 5.0 pF 100 150 -- mA 49 -- 63 mA en On Resistance 475 de Output (Drain) Leading edge Blanking delay TBLANK 200 300 400 nS Minimum Turn On-Time TON(MIN) -- -- 650 nS TOFF 8 10.5 13 µS Off-Time Generator Turn On-Time No tR Block Diagram e co Note 1: The specification which apply over the full operating ambient temperature range of -40ºC