lm2577用户手册 LM1577/LM2577 SIMPLE SWITCHER Step-Up Voltage Regulator April 2005 LM1577/LM2577 SIMPLE SWITCHER Step-Up Voltage Regulator General Description Features The LM1577/LM2577 are monolithic integrated circuits that n Requires few external components provide all of the power and control functions for step-up n NPN output switches 3.0A, can stand off 65V (boost), flyback, and forward ……