IRS2541STRPBF

Data Sheet No. PD60293 IRS254(0,1)(S)PbF LED BUCK REGULATOR CONTROL IC Description The IRS254(0,1) are high voltage, high frequency buck control ICs for constant LED current regulation. They incorporate a continuous mode time-delayed hysteretic buck regulator to directly control the average load current, using an accurate on-chip bandgap voltage reference. The application is inherently protected against short circuit conditions, with the ability to easily add opencircuit protection. An external high-side bootstrap circuit drives the buck switching element at high frequencies. A low-side driver is also provided for synchronous rectifier designs. All functions are realized within a simple 8 pin DIP or SOIC package. Features • 200 V (IRS2540) and 600 V (IRS2541) half bridge driver • Micropower startup (VENTH+ IFB = 1 V Duty Cycle = 50% f = 50 kHz ICC = 10 mA V VCC rising from 0 V VCC falling from 14 V Floating Supply Characteristics IQBS0 IQBS1 VBSUV+ VBSUVILK Quiescent VBS supply current Quiescent VBS supply current VBS supply undervoltage positive going threshold VBS supply undervoltage negative going threshold Offset supply leakage current ----6.5 6.0 --1.0 2.0 7.5 7.0 1 2.0 3.0 8.5 V 8.0 50 µA IRS2540:VB=VS=200 V IRS2541:VB=VS=600 V mA VHO = VS IFB = 0 V Current Control Operation VENNTH+ VENNTHV0.5 VIFBTH f ENN pin positive threshold ENN pin negative threshold 0.5 V voltage reference (die level test) IFB pin threshold Maximum frequency 2.5 1.7 490 455 --2.7 2.0 500 500 500 3.0 2.3 510 540 --kHz V mV Gate Driver Output Characteristics VOL VHL tr tf IO+/DT tLO,ON tLO,OFF tHO,ON tHO,OFF Low level output voltage (HO or LO) High level output voltage (HO or LO) Turn-on rise time Turn-off fall time Output source/sink short circuit pulsed current Deadtime Delay between VIFB>VIFBTH and LO turn-on Delay between VIFB