LD7575A
11/29/2007
Green-Mode PWM Controller with High-Voltage
Rev.00a
Start-Up Circuit
General Description
The LD7 575A is a c urrent-mode PWM con troller with
excellent pow er-saving o peration. It fea tures a high-
voltage 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 le ading-edge
blanking of the current sensing, internal slope compensation,
and the small package provide the users a high effic iency,
minimum external component counts, and low cost solution
for AC/DC power applications.
Furthermore, the e mbedded over volt age protection, o ver
load protection and the special green-mode control provide
the solution fo r users to design a hig h performance po wer
circuit easily. The LD7575A is offered in both SOP-8 and
DIP-8 package.
Features
z High-Voltage (500V) Startup Circuit
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 Programmable Switching Frequency
z Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc
z OLP (Over Load Protection)
z 500mA Driving Capability
Applications
z Switching AC/DC Adapter and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
Leadtrend Technology Corporation
LD7575A-DS-00a November 2007
1
www.leadtrend.com.tw
http://www.Datasheet4U.com
