IRS254(0,1) Data Sheet No. PD60293 Not recommended for new design IRS254(0,1)(S)PbF LED BUCK REGULATOR CONTROL IC Description Features The IRS254(0,1) are high voltage, high frequency 200 V (IRS2540) and 600 V (IRS2541) half bridge buck control ICs for constant LED current regulation. driver They incorporate a continuous mode time-delayed Micropower startup (<500 A) hysteretic buck regulator to directly control the 2% voltage reference average load current, using an accurate on-chip 140 ns deadtime bandgap voltage reference. 15.6 V zener clamp on V CC Frequency up to 500 kHz The application is inherently protected against short Auto restart, non-latched shutdown circuit conditions, with the ability to easily add open- PWM dimmable circuit protection. An external high-side bootstrap Small 8-Lead DIP/8-Lead SOIC packages circuit drives the buck switching element at high frequencies. A low-side driver is also provided for Packages synchronous rectifier designs. All functions are realized within a simple 8 pin DIP or SOIC package. 8-Lead PDIP 8-LeadSOIC IRS254(0,1)PbF IRS254(0,1)SPbF Typical Application Diagram VBUS L2 VOUT+ RS1 RS2 DBOOT IC1 VCC VB CVCC1 1 8 ROV1 COM HO RG1 2 7 M1 DCLAMP CVCC2 CBUS2 CBOOT L1 IFB VS 3 6 CBUS1 DOV ENN LO M2 4 5 RG2 ROV2 COUT CEN RF VOUT- RCS ROUT CF COM EN DEN1 www.irf.com Page 1 IRS254(0,1) IRS254(0,1)(S)PbF Alternate application circuit using a single MOSFET www.irf.com Page 2