is 1 t e c h n o l o g y AT3263 current mode pwm controller description AT3263 is highly integrated current mode pwm control ic optimized for high perform ance low standby power offline fly back converter applications. to meet the international power conservation requirements, optimized green mode is integrated to improve the efficiency at light or no load conditions with no audible noise. slope compensation is integrated to ensure the stability at high load. lead edge blanking is integrated to prevent the false trigger at the transition of the switch. soft switching control at the gate drive can improve the emi performance of the power supply. the gate - drive output is clamped at 18v to protect the power mos. AT3263 offers many protection functions with auto features frequency jitter function to improve emi performance of power supply no - audible - noise green mode control external programmable pwm switching frequency internal slope compensation low vdd startup current and low operating current leading edge blan king uvlo gate max output voltage clamp at 18v overload protection (olp). line compensation over current protection (ocp) self - recovery feature, including cycle - by - cycle current limiting, over load protection (olp) and under voltage lockout (u vlo). applications offline ac/dc fly back converter for excellent emi performance achieved with battery charger frequency jitter technique together with soft switching control at the totem pole gate driver. AT3263 is offered in sot23 - 6, sop - 8 an d dip - 8 packages. power adaptor set - top box power supplies open - frame smps pc 5v standby power http://www.sirectsemi.com/atc
2 t e c h n o l o g y AT3263 pin assignments s6 package (sot23 - 6) ordering information AT3263 date gnd 1 6 gate fb ri 2 3 5 4 vdd sense p: pb free with commercial standard (r o hs compliant) package type s6:sot23 - 6 pd:p - dip8 figure 1. pin assignment of AT3263 for sot23 - 6 pd8&sop8 package (p - dip8&sop8) so:sop(normal)8 gate vdd nc sense 1 2 3 4 8 7 6 5 gnd fb nc ri figure 2. pin assignment of AT3263 for p - dip8&sop8 http://www .sirectsemi.com/atc
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