LD7751
12/28/2010
High Voltage Green-Mode PWM Controller
Rev. 00
General Description
The LD7751 integrates several functions of protections,
and EMI-improved solution in a SOP-7, SOP-8 or DIP-8
package to minimize the component counts and the circuit
space.
The device provides functions of low startup current,
green-mode power-saving operation, leading-edge
blanking of the current sensing and internal slope
compensation. Also, the LD7751 features more
protections like OLP (Over Load Protection), and OVP
(Over Voltage Protection) to prevent the circuit being
damaged under the abnormal conditions. The LD7751
features built-in auto-recovery function for OVP on Vcc pin
and OLP.
Features
z High-Voltage (500V) Startup Circuit
z Current Mode Control
z Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Internal Frequency Swapping
z Internal Slope Compensation
z Internal Over Current Protection
z OVP (Over Voltage Protection) on Vcc
z OLP (Over Load Protection)
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
EMI
Filter
Leadtrend Technology Corporation
LD7751-DS-00 December 5, 2010
1
www.leadtrend.com.tw
