Datasheet > LNK520G-TL

LNK520G-TL

更新时间： 2024-02-14 14:23:44

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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技术参数
数据手册

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LNK520G-TL 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：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory 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 V	JESD-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 mm	Base Number Matches：	1

LNK520G-TL 数据手册

LNK520

OUT

VR1

RTN

85-265

VAC

LinkSwitch

LNK520

PI-3703-030404

Figure 6. Power Supply Schematic Outline with Optocoupler Feedback, Providing Tight CV Regulation.

The characteristics described above provide an approximate

CV/CCpowersupplyoutputwithouttheneedforsecondaryside

voltage or current feedback. The output voltage regulation is

inﬂuencedbyhowwellthevoltageacrossC2tracksthereﬂected

output voltage. This tracking is inﬂuenced by the coupling

between transformer output and bias windings. Tight coupling

improvesCVregulationandrequiresonlyalowvalueforresistor

R2.PoorcouplingdegradesCVregulationandrequiresahigher

value for R2 to ﬁlter leakage inductance spikes on the bias

winding voltage waveform. This circuitry, used with standard

transformer construction techniques, provides much better

output load regulation than a linear transformer, making this an

ideal power supply solution in many low power applications.

If even tighter load regulation is required, an optocoupler

conﬁguration can be used while still employing the constant

output current characteristics provided by LinkSwitch.

for U1 current and VR1 slope resistance should be consulted

to determine whether R5 is required.

When the power supply operates in the constant current (CC)

region, for example at start up and when charging a battery,

the output voltage is below the voltage feedback threshold

deﬁned by U1 and VR1 and the optocoupler is fully off. In this

region, the circuit behaves exactly as previously described with

reference to Figure 5 where the voltage across C2 and therefore

thecurrentﬂowingthroughR1increaseswithincreasingoutput

voltage and the LinkSwitch internal current limit is adjusted to

provide an approximate CC output characteristic.

When the output reaches the voltage feedback threshold set by

U1 and VR1, the optocoupler turns on. Any further increase

in the power supply output voltage results in the U1 transistor

current increasing. The resulting increase in the LinkSwitch

CONTROL current reduces the duty cycle according to

Figure 4 and therefore, maintains the output voltage

regulation.

Optional Secondary Feedback

Figure 6 shows a typical power supply schematic outline using

LinkSwitchwithoptocouplerfeedbacktoimproveoutputvoltage

regulation. On the primary side, the schematic only differs

from Figure 5 by the addition of optocoupler U1 transistor in

parallel to R1.

Figure 7 shows the inﬂuence of optocoupler feedback on the

output characteristic. The envelope deﬁned by the dashed lines

represent the worst-case power supply DC output voltage and

currenttolerances(unit-to-unitandovertheinputvoltagerange)

if an optocoupler is not used. A typical example of an inherent

(without optocoupler) output characteristic is shown dotted.

This is the characteristic that would result if U1, R4, R5 and

VR1 were removed. The optocoupler feedback results in the

characteristicshownbythesolidline.Theloadvariationarrowin

Figure7representsthelocusoftheoutputcharacteristicnormally

seen during a battery charging cycle. The two characteristics

are identical as the output voltage rises but then separate as

shown when the voltage feedback threshold is reached. This

On the secondary side, the addition of voltage sense circuit

componentsR4,VR1andU1LEDprovidethevoltagefeedback

signal. In the example shown, a simple Zener (VR1) reference

is used though more accurate references may be employed for

improved output voltage tolerancing and to provide cable drop

compensation,ifrequired.ResistorR4providesbiasingforVR1.

The regulated output voltage is equal to the sum of the VR1

Zener voltage plus the forward voltage drop of the U1 LED.

Resistor R5 is an optional low value resistor to limit U1 LED

peakcurrentduetooutputripple.Manufacturerʼsspeciﬁcations

2/05

1 2 345 6 7...20

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