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LNK520P

更新时间： 2024-01-11 21:53:25
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT /
页数 文件大小 规格书
20页 844K
描述
Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers

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LNK520P 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Not Recommended零件包装代码：DIP
包装说明：DIP-8/7针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01Factory Lead Time：14 weeks
风险等级：8.41其他特性：REQUIRES AN AC SUPPLY OF 85 TO 265V
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制技术：PULSE WIDTH MODULATION
最大输入电压：6 V最小输入电压：5.5 V
标称输入电压：5.75 VJESD-30 代码：R-PDIP-T8
JESD-609代码：e3长度：9.575 mm
功能数量：1端子数量：8
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：0.28 A封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装形状：RECTANGULAR
封装形式：IN-LINE峰值回流温度（摄氏度）：NOT SPECIFIED
认证状态：Not Qualified表面贴装：NO
切换器配置：SINGLE最大切换频率：49.5 kHz
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：7.62 mmBase Number Matches：1

LNK520P 数据手册

 浏览型号LNK520P的Datasheet PDF文件第1页浏览型号LNK520P的Datasheet PDF文件第2页浏览型号LNK520P的Datasheet PDF文件第4页浏览型号LNK520P的Datasheet PDF文件第5页浏览型号LNK520P的Datasheet PDF文件第6页浏览型号LNK520P的Datasheet PDF文件第7页 
LNK520  
LinkSwitch Functional Description  
Internal Current Limit  
Auto-restart  
The duty cycle, current limit and operating frequency  
relationships with CONTROL pin current are shown in  
Figure4.Figure5showsatypicalpowersupplyschematicoutline  
which is used below to describe the LinkSwitch operation.  
ILIM  
Power Up  
Duringpowerup,asVIN isfirstapplied(Figure5),theCONTROL  
pin capacitor C1 is charged through a switched high voltage  
current source connected internally between the DRAIN and  
CONTROLpins(seeFigure2).WhentheCONTROLpinvoltage  
reaches approximately 5.6 V relative to the SOURCE pin, the  
high voltage current source is turned off, the internal control  
circuitry is activated and the high voltage internal MOSFET  
starts to switch. At this point, the charge stored on C1 is used  
to supply the internal consumption of the chip.  
CONTROL Current IC  
IDCT  
Duty Cycle  
Auto-restart  
77%  
Constant Current (CC) Operation  
As the output voltage, and therefore the reflectedvoltage across  
thetransformerbiaswindingrampup,thefeedbackCONTROL  
current IC flowing through R1 increases.As shown in Figure 4,  
theinternalcurrentlimitincreaseswithIC andreachesILIM when  
IC is equal to IDCT. The internal current limit vs. IC characteristic  
is designed to provide an approximately constant power supply  
output current as the power supply output voltage rises.  
30%  
3.8%  
ICD1  
IDCS  
CONTROL Current IC  
Frequency  
Constant Voltage (CV) Operation  
Auto-restart  
When IC exceeds IDCS, typically 2 mA(Figure 4), the maximum  
duty cycle is reduced. At a value of IC that depends on power  
supply input voltage, the duty cycle control limits LinkSwitch  
peak current below the internal current limit value.At this point  
the power supply transitions from CC to CV operation. With  
minimum input voltage in a typical universal input design, this  
transition occurs at approximately 30% duty cycle. Resistor R1  
(Figure 5)is therefore initially selected to conduct a value of IC  
approximately equal to IDCT when VOUT is at the desired value  
at the minimum power supply input voltage. The final choice  
of R1 is made when the rest of the circuit design is complete.  
When the duty cycle drops below approximately 4%, the  
frequencyisreduced,whichreducesenergyconsumptionunder  
light load conditions.  
fOSC  
fOSC(low)  
CONTROL Current IC  
PI-3579-031004  
Figure 4. CONTROL Characteristics.  
D1  
Auto-Restart Operation  
VOUT  
R3  
C3  
C4  
When a fault condition, such as an output short circuit or open  
loop, prevents flow of an external current into the CONTROL  
pin, the capacitor C1 discharges towards 4.7 V. At 4.7 V, auto-  
restart is activated, which turns the MOSFET off and puts the  
control circuitry in a low current fault protection mode. In  
auto-restart, LinkSwitch periodically restarts the power supply  
so that normal power supply operation can be restored when  
the fault is removed.  
D3  
D2  
VIN  
LinkSwitch  
D
S
R2  
R1  
C1  
IC  
C
C2  
PI-3578-021405  
Figure 5. Power Supply Schematic outline.  
E
2/05  
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