LD7520

LD7520 11/29/2007 Smart Green-Mode PWM Controller with Multiple Protections Spec. 02a General Description The LD7520 is a low startup current, current mode PWM controller with green-mode power-saving operation. The SOP-8/DIP-8 package integrated functions such as the leading- edge blanking of the current sensing, internal slope compensation, line compensation, and several protection features. The protection functions include cycle-by-cycle current limit, OVP, OTP, and OLP. It provides the users a high efficiency, low external component counts solution for AC/DC power applications. Furthermore, to satisfy various protection requirements, both latch-mode protection and auto-recoverable protection can be easily achieved by configuring LD7520 in different operation modes. The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7520 is operating under light load or no load condition. Features z High-Voltage CMOS Process with Excellent ESD protection z Very Low Startup Current (< 35μA) z Current Mode Control z Non-audible-noise Green Mode Control z UVLO (Under Voltage Lockout) z LEB (Leading-Edge Blanking) on CS Pin z Internal Slope Compensation z Programmable Line Compensation z OVP (Over Voltage Protection) z OLP (Over Load Protection) z OTP (Over Temperature Protection) through a NTC z Flexibility on Latch/Auto-Recoverable Protection Mode z 500mA Driving Capability Applications z Switching AC/...