SD4840

SD4840/4841/4842/4843/4844 CURRENT MODE PWM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET DESCRIPTION SD4840/4841/4842/4843/4844 is a current mode PWM controller with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI. The stress on transformer during power on is reduced by the builtin 15ms soft start circuit to avoid the saturation of transformer. SD4840/4841/4842/4843/4844 includes under voltage lock-out, over voltage protection, leading edge blanking, over current protection and the temperature protection. The circuit will restart automatically until the system is normal after the protection is active. FEATURES * Lower start-up current (Typ.6μA) * Frequency jitter for low EMI * Overcurrent protection * Overvoltage protection * Undervoltage lockout * Built-in temperature protection * Built-in high voltage MOSFET www.DataSheet4U.com * Auto restart mode APPLICATIONS * Switch power * Built-in soft start * Burst mode operation * Cycle by cycle current limit ORDERING INFORMATION Part No. SD4840P67K65 SD4841P67K65 SD4842P67K65 SD4843P67K65 SD4844P67K65 DIP-8-300-2.54 Package Marking SD4840P67K65 SD4841P67K65 SD4842P67K65 SD4843P67K65 SD4844P67K65 Note: P denotes it is available in DIP8 package, 67k denotes 67KHz, and 65 denotes withstand voltage is 650V. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.sila...