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LD7577B fiches techniques PDF

Leadtrend - High Voltage Green-Mode PWM Controller

Numéro de référence LD7577B
Description High Voltage Green-Mode PWM Controller
Fabricant Leadtrend 
Logo Leadtrend 





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LD7577B fiche technique
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

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