LD7575
6/5/2007
1
Leadtrend Technology Corporation
LD7575-DS-04a June 2007
Green-Mode PWM Controller with High-Voltage
Start-Up Circuit
REV: 04a
General Description
The LD7575 is a current-mode PWM controller with
excellent power-saving operation.
It features 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 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.
The LD7575 is offered in both SOP-8 and
DIP-8 package.
Features
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
Applications
Switching AC/DC Adapter and Battery Charger
Open Frame Switching Power Supply
LCD Monitor/TV Power
Typical Application
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