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LNK305DG

更新时间： 2024-01-21 21:54:59
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT 开关光电二极管
页数 文件大小 规格书
20页 712K
描述
LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC

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LNK305DG 技术参数

是否Rohs认证： 符合生命周期：Active
零件包装代码：SOIC包装说明：SOP,
针数：8Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
Factory Lead Time：14 weeks风险等级：0.72
其他特性：REQUIRES AN AC SUPPLY OF 85 TO 256V模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制技术：PULSE WIDTH MODULATIONJESD-30 代码：R-PDSO-G8
JESD-609代码：e3长度：4.9 mm
湿度敏感等级：1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：0.8 A
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.75 mm表面贴装：YES
切换器配置：BUCK最大切换频率：70 kHz
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：3.9 mmBase Number Matches：1

LNK305DG 数据手册

 浏览型号LNK305DG的Datasheet PDF文件第1页浏览型号LNK305DG的Datasheet PDF文件第2页浏览型号LNK305DG的Datasheet PDF文件第4页浏览型号LNK305DG的Datasheet PDF文件第5页浏览型号LNK305DG的Datasheet PDF文件第6页浏览型号LNK305DG的Datasheet PDF文件第7页 
LNK302/304-306  
The LinkSwitch-TN oscillator incorporates circuitry that  
introduces a small amount of frequency jitter, typically 4 kHz  
peak-to-peak, to minimize EMI emission. The modulation rate  
of the frequency jitter is set to 1 kHz to optimize EMI reduction  
for both average and quasi-peak emissions. The frequency  
jitter should be measured with the oscilloscope triggered at  
the falling edge of the DRAIN waveform. The waveform in  
Figure 4 illustrates the frequency jitter of the LinkSwitch-TN.  
Pin Functional Description  
DRAIN (D) Pin:  
Power MOSFET drain connection. Provides internal operating  
current for both start-up and steady-state operation.  
BYPASS (BP) Pin:  
Connection point for a 0.1 μF external bypass capacitor for the  
internally generated 5.8 V supply.  
Feedback Input Circuit  
FEEDBACK (FB) Pin:  
The feedback input circuit at the FB pin consists of a low  
impedancesourcefolloweroutputsetat1.65V.Whenthecurrent  
deliveredintothispinexceeds49μA,alowlogiclevel(disable)  
is generated at the output of the feedback circuit. This output  
is sampled at the beginning of each cycle on the rising edge of  
the clock signal. If high, the power MOSFET is turned on for  
thatcycle(enabled), otherwisethepowerMOSFETremainsoff  
(disabled). Since the sampling is done only at the beginning of  
each cycle, subsequent changes in the FB pin voltage or current  
during the remainder of the cycle are ignored.  
During normal operation, switching of the power MOSFET is  
controlled by this pin. MOSFET switching is terminated when  
a current greater than 49 μA is delivered into this pin.  
SOURCE (S) Pin:  
This pin is the power MOSFET source connection. It is also the  
ground reference for the BYPASS and FEEDBACK pins.  
P Package (DIP-8B)  
G Package (SMD-8B)  
5.8 V Regulator and 6.3 V Shunt Voltage Clamp  
D Package (SO-8C)  
The 5.8 V regulator charges the bypass capacitor connected to  
the BYPASS pin to 5.8 V by drawing a current from the voltage  
on the DRAIN, whenever the MOSFET is off. The BYPASS  
pin is the internal supply voltage node for the LinkSwitch-TN.  
When the MOSFET is on, the LinkSwitch-TN runs off of the  
energy stored in the bypass capacitor. Extremely low power  
consumption of the internal circuitry allows the LinkSwitch-TN  
tooperatecontinuouslyfromthecurrentdrawnfromtheDRAIN  
pin. A bypass capacitor value of 0.1 μF is sufficient for both  
high frequency decoupling and energy storage.  
S
S
S
S
1
2
8
7
1
2
8
7
BP  
FB  
S
S
S
S
6
5
BP  
FB  
3
4
4
D
5
D
3a  
3b  
PI-3491-120706  
In addition, there is a 6.3 V shunt regulator clamping the  
BYPASS pin at 6.3 V when current is provided to the BYPASS  
pin through an external resistor. This facilitates powering of  
LinkSwitch-TN externally through a bias winding to decrease  
the no-load consumption to about 50 mW.  
Figure 3. Pin Configuration.  
LinkSwitch-TN Functional  
Description  
BYPASS Pin Under-Voltage  
LinkSwitch-TNcombinesahighvoltagepowerMOSFETswitch  
withapowersupplycontrollerinonedevice.Unlikeconventional  
PWM(pulsewidthmodulator)controllers,LinkSwitch-TNuses  
a simple ON/OFF control to regulate the output voltage. The  
LinkSwitch-TN controller consists of an oscillator, feedback  
(sense and logic) circuit, 5.8 V regulator, BYPASS pin under-  
voltagecircuit,over-temperatureprotection,frequencyjittering,  
current limit circuit, leading edge blanking and a 700 V power  
MOSFET.TheLinkSwitch-TNincorporatesadditionalcircuitry  
for auto-restart.  
The BYPASS pin under-voltage circuitry disables the power  
MOSFET when the BYPASS pin voltage drops below 4.85 V.  
Once the BYPASS pin voltage drops below 4.85 V, it must rise  
back to 5.8 V to enable (turn-on) the power MOSFET.  
Over-Temperature Protection  
The thermal shutdown circuitry senses the die temperature.  
The threshold is set at 142 °C typical with a 75 °C hysteresis.  
Whenthedietemperaturerisesabovethisthreshold(142°C)the  
power MOSFET is disabled and remains disabled until the die  
temperature falls by 75 °C, at which point it is re-enabled.  
Oscillator  
The typical oscillator frequency is internally set to an average  
of 66 kHz. Two signals are generated from the oscillator: the  
maximum duty cycle signal (DCMAX) and the clock signal that  
indicates the beginning of each cycle.  
Current Limit  
ThecurrentlimitcircuitsensesthecurrentinthepowerMOSFET.  
When this current exceeds the internal threshold (ILIMIT), the  
3
Rev. I 11/08  
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