LD7550 PDF File ( Datasheet )

LD7550 8, 27, 2004 Green-Mode PWM Controller General Description The LD7550 is a low cost, low startup current, current mode PWM controller with green-mode power-saving operation. The integrated functions such as the leading-edge blanking of the current sensing, internal slope compensation and the small SOT-26 package provide the users a high efficiency, low external component counts, and low cost solution for AC, DC power applications. The special green-mode control is not only to achieve the

LD7550-B 12, 22, 2006 Green-Mode PWM Controller REV: 01a General Description The LD7550-B is a low cost, low startup current, current mode PWM controller with green-mode power-saving operation. The integrated functions such as the Features - - - - - - - - - - z High-Voltage CMOS Process with Excellent ESD protection Very Low Startup Current (<20 A) Under Voltage Lockout (UVLO) Current Mode Control with Cycle-by-Cycle Peak Current Limiting Leading-Edge Blanking on CS Pin Programmable Switchin