High Voltage Green-Mode PWM Controller
LD7577B
7/10/2009
High Voltage Green-Mode PWM Controller with
Brown-Out Protection
Rev. 00
General Description
The LD...
Description
LD7577B
7/10/2009
High Voltage Green-Mode PWM Controller with
Brown-Out Protection
Rev. 00
General Description
The LD7577B integrates several functions of protections, and EMI-improved solution in SOP-8/ DIP-8 package. It minimizes 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, it features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and brownout protection to prevent the circuit from being damaged under abnormal conditions.
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 Internal Slope Compensation z OVP (Over Voltage Protection) on Vcc Pin z OLP (Over Load Protection) z Precision Brownout 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
AC input
EMI Filter
*
HV VCC OUT
BNO
LD7577B
CS GND COMP
*
*See Application Information
photocoupler TL431
Leadtrend Technology Corporation
LD7560-DS-00 July 2009
1
www.leadtrend.com.tw
Pin Configuration
LD7577B
SOP-8 & DIP-8 (TOP VIEW)
HV NC VCC OUT
8 76 5
TOP MARK YYWWPP
1234
YY:
WW: PP:
Year code
Week code Production code
BNO COMP
CS GND
Ordering Informati...
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