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LD5525

更新时间： 2024-11-30 02:52:35
品牌 Logo 应用领域
通嘉科技 - LEADTREND /
页数 文件大小 规格书
16页 734K
描述
Multi-Mode PWM Controller of Flyback with Integrated BNI/BNO and Protection

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LD5525 数据手册

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LD5525  
06/30/2015  
Multi-Mode PWM Controller of Flyback with  
Integrated BNI/BNO and Protection  
REV. 00  
Features  
General Description  
Secondary-side feedback control with  
In order to enhance the efficiency performance, the  
LD5525 integrates the multi-mode PWM controller,  
which consists of Quasi-Resonant (QR) PWM control for  
light load condition and Continue Conduction Mode  
(CCM) for heavy load condition. Moreover, the QR  
controller not only gains the system performance, but  
also brings the worse EMI capability, while the  
frequency swapping function of LD5525 can reduce the  
EMI emission of SMPS and helps the power circuit  
designers to simply deal with EMI filter and saves  
several component and developing time.  
quasi-resonant operation  
Low Startup Current (<3A)  
0.5mA Ultra-low operating current at light load  
Current Mode Control with Cycle-by-Cycle Current  
Limit  
Green Mode Control  
UVLO (Under Voltage Lockout)  
LEB (Leading-Edge Blanking) on CS Pin  
VCC OVP (Over Voltage Protection)  
Adj. OVP (Over Voltage Protection) on FB pin.  
Adj. UVP (Under Voltage Protection) on FB pin.  
Adjustable Brown in/out on FB pin.  
OLP (Over Load Protection)  
The LD5525 is implemented in SOT-26 package, and  
includes the comprehensive protection function, such as  
Over Load Protection (OLP), Over Voltage Protection  
(OVP), Output Short Circuit Protection (OSCP) and  
External OTP (Over Temperature Protection) on  
CS Pin  
internal  
Over  
Temperature  
Protection  
(OTP).  
Internal OTP (Over Temperature Protection)  
Gate Source/Sink Capability: 250mA/-500mA  
Furthermore, the programmable Brown-in/out Protection  
is built-in.  
Applications  
Switching AC/DC Adaptor  
Typical Application  
DC  
Output  
AC  
input  
EMI  
Filter  
VCC  
OUT  
CS  
FB  
LD5525  
photocoupler  
COMP  
GND  
NTC  
1
Leadtrend Technology Corporation www.leadtrend.com.tw  
LD5525-DS-00 June 2015  
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