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LD7752B fiches techniques PDF

Leadtrend - Green-Mode PWM Controller

Numéro de référence LD7752B
Description Green-Mode PWM Controller
Fabricant Leadtrend 
Logo Leadtrend 





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LD7752B fiche technique
LD7752B
6/11/2013
Green-Mode PWM Controller with HV Start-Up Circuit and
Soft Start time Adjustment
REV. 00
General Description
The LD7752B brings high performance, highly integrated
functions, protections and EMI-improve solution. Its an
ideal solution for those cost-sensitive system, reducing
component count and overall system cost.
The LD7752B features high voltage startup circuit,
minimum loss and green-mode power-saving operation,
leading-edge blanking of the current sensing and internal
slope compensation. They also consist of more
protections of OLP (Over Load Protection) and OVP (Over
Voltage Protection) to prevent the circuit from damage
under abnormal conditions.
Furthermore, the proprietary frequency swapping function
can reduce the noise and help the power circuit designers
to enhance EMI performance with fewer components and
less developing time.
Features
High-Voltage Startup Circuit
UVLO (Under Voltage Lockout)
LEB (Leading-Edge Blanking) on CS Pin
Internal Frequency swapping
Internal Slope Compensation
Internal OCP Compensation
OVP (Over Voltage Protection) on Vcc Pin
OLP (Over Load Protection)
+250mA/-500mA Driving Capability
Soft-Driving
Soft Start Time and Grouping Frequency Adjustment
Applications
LCD Monitor/TV Power
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
Typical Application
AC EMI
input Filter
HV VCC
*CT OUT
LD7752B
CS
GND COMP
photocoupler
Leadtrend Technology Corporation
LD7752B-DS-00 June 2013
1
www.leadtrend.com.tw

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