Datasheet > LNK520G

LNK520G

更新时间： 2024-01-24 08:41:04

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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LNK520G 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 数据手册

LNK520

Feedback Resistor – R4

Quick Design Checklist

The value of R4 is selected to give a feedback current into the

CONTROL pin of approximately 2.15 mA at the peak output

power point of the supply. The actual value depends on the bias

voltage, typically in the range 20 V to 35 V, selected during

design. Higher values for the bias voltage will increase no-load

power consumption. Any 1%, 0.25 W resistor is suitable.

As with any power supply design, all LinkSwitch designs

should be veriﬁed on the bench to make sure that component

speciﬁcations are not exceeded under worst-case conditions.

Performing the following minimum set of tests is strongly

recommended:

Output Diode – D7

1. Maximum drain voltage – Verify that V_DSdoes not exceed

675 V at highest input voltage and peak output power.

PNfast, PNultra-fastorSchottkydiodescanbeuseddepending

on the efﬁciency target for the supply, Schottky diodes giving

higher efﬁciency than PN diodes. The diode voltage rating

should be sufﬁcient to withstand the output voltage plus the

input voltage transformed through the turns ratio (a typical V_OR

of 50 V requires a diode PIV of 50 V). Slow recovery diodes

are not recommended (1N400X types).

2. Maximumdraincurrent–Atmaximumambienttemperature,

maximuminputvoltageandpeakoutputpower, verifydrain

current waveforms at start-up for any signs of transformer

saturation and excessive leading edge current spikes.

LinkSwitch has a minimum leading edge blanking time of

200 ns to prevent premature termination of the on-cycle.

Verify that the leading edge current spike event is below

current limit at the end of the 200 ns blanking period.

Output Capacitor – C6

Capacitor C6 should be selected such that its voltage and

ripple current speciﬁcations are not exceeded. Selecting a

capacitor with low equivalent series resistance (ESR) will

reduce peak-peak output ripple and improve overall supply

operating efﬁciency.

3. Thermal check – At peak output power, minimum input

voltage and maximum ambient temperature, verify that the

temperaturespeciﬁcations are not exceededfor LinkSwitch,

transformer, output diode and output capacitors. Enough

thermalmarginshouldbeallowedforpart-to-partvariationof

theR_DS(ON)ofLinkSwitchasspeciﬁedinthedatasheet.Under

lowline, peakpower, amaximumLinkSwitchSOURCEpin

temperature of 100 °C is recommended to allow for these

variations.

LinkSwitch Layout considerations

Primary Side Connections

The copper area connected to SOURCE should be maximized

to minimize temperature rise of the LinkSwitch device.

The CONTROL pin capacitor C5 should be located as close as

possible to the SOURCE and CONTROL pins.

4. Centered output characteristic – Using a transformer with

nominalprimaryinductanceandataninputvoltagemidway

between low and high line, verify that the peak power point

occurs at ~4% above the desired nominal output current,

with the correct output voltage. If this does not occur, then

the design should be reﬁned (increase L_P) to ensure the

overall tolerance limits are met.

TominimizeEMIcouplingfromtheswitchingDRAINnodeon

the primary to both the secondary andAC input, the LinkSwitch

shouldbepositionedawayfromthesecondaryofthetransformer

and AC input.

The length and copper area of all PCB traces connecting to the

switchingDRAINnodeshouldbekepttoanabsoluteminimum

to limit EMI radiation.

Selecting Between LNK500 and LNK520

The LNK500 and LNK520 differ in the circuit location of the

LinkSwitch device. The LNK500 is designed for high-side

operation and the LNK520 is designed for low-side operation.

TheLNK520can,however,beusedinthehigh-sideconﬁguration

in certain applications. Refer to Figure 9 and supporting

description.Table2summarizestheconsiderationsforselecting

which device to use.

Y capacitor

If a Y capacitor is required, it should be connected close to the

transformersecondaryoutputreturnpin(s)andtheprimarybulk

capacitor positive terminal. Such placement will maximize the

EMI beneﬁt of theYcapacitor and avoid problems in common-

mode surge testing.

Design Tools

Up to date information on design tools can be found at the

Power Integrations Web site: www.powerint.com.

2/05

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LNK520G 替代型号

型号	品牌	替代类型	描述	数据表
LNK520G-TL	POWERINT	功能相似	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers

与LNK520G相关器件

型号	品牌	获取价格	描述	数据表
LNK520GN	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520GN-TL	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520G-TL	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520P	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520PN	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520PN-TL	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520P-TL	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK562	POWERINT	获取价格	Energy Effi cient Off-Line Switcher IC for Linear Transformer Replacement
LNK562_08	POWERINT	获取价格	Energy Effi cient Off-Line Switcher IC for Linear Transformer Replacement
LNK562D	POWERINT	获取价格	Energy Effi cient Off-Line Switcher IC for Linear Transformer Replacement

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