Datasheet DownloadSpecifications, Features, Applications
Green-Mode PWM Controller with High-Voltage Start-Up Circuit
The is a current-mode PWM controller with excellent power-saving operation. It features a highvoltage current source to directly supply the startup current from bulk capacitor and further to provide a lossless startup circuit. The integrated functions such as the leading-edge blanking of the current sensing, internal slope compensation, and the small package provide the users a high efficiency, minimum external component counts, and low cost solution for AC/DC power applications. Furthermore, the embedded over voltage protection, over load protection and the special green-mode control provide the solution for users to design a high performance power circuit easily. DIP-8 package. The LD7575 is offered in both SOP-8 and
High-Voltage (500V) Startup Circuit Current Mode Control Non-Audible-Noise Green Mode Control UVLO (Under Voltage Lockout) LEB (Leading-Edge Blanking) on CS Pin Programmable Switching Frequency Internal Slope Compensation OVP (Over Voltage Protection) on Vcc OLP (Over Load Protection) 500mA Driving Capability
Switching AC/DC Adapter and Battery Charger Open Frame Switching Power Supply LCD Monitor/TV Power
Year code Week code Production code
Part number LD7575 PN Package SOP-8 DIP-8 Top Mark LD7575PS LD7575PN Shipping 2500 /tape & reel 3600 /tube /Carton
PIN 1 NAME RT FUNCTION This pin is to program the switching frequency. By connecting a resistor to ground to set the switching frequency. Voltage feedback pin (same as the COMP pin UC384X), By connecting a photo-coupler to close the control loop and achieve the regulation. Current sense pin, connect to sense the MOSFET current Ground Gate drive output to drive the external MOSFET Supply voltage pin Unconnected Pin Connect this pin to positive terminal of bulk capacitor to provide the startup current 8 HV for the controller. When Vcc voltage trips the UVLO(on), this HV loop will be off to save the power loss on the startup circuit.

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