SD4871

SD4871_Datasheet CURRENT MODE PWM CONTROLLER DESCRIPTION SD4871 is a current mode PWM controller IC for high performance, low standby power offline flyback converter application. In no load or light load condition, the IC operates in Light Load Mode to reduce switching loss and improve efficiency. Large startup resistor could be used in the startup circuit to minimize the standby current because of low startup current. SD4871 offers complete protection functions including cycle-bycycle over current protection, over load protection, over voltage SOT-23-6L and under voltage protections for VDD voltage, etc. Excellent EMI performance is achieved with frequency shuffling technique and soft switching control at the totem pole gate driver output. APPLICATIONS FEATURES * Battery Chargers * Frequency shuffling to improve EMI performance * Adapters * Light Load Mode for minimum standby power * Set-Top Box Power Supplies * External programmable switching frequency * 3μA low startup current * Internal LEB circuit * VDD over voltage and under voltage protection * Gate output maximum voltage clamp * Current limiting * Over load protection * SOT-23-6L package ORDERING INFORMATION Part No. SD4871TR Package SOT-23-6L Marking 4871 Material Pb free Packing Tape & Reel HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:0.2 2011.06.21 Page 1 of 6 BLOCK DIAGRAM SD4871_Datasheet ABSOLUTE MAXIMUM RATINGS Characteristics Supply Voltage Feedbac...