Datasheet > LNK305DG

LNK305DG

更新时间： 2024-01-02 19:47:18

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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技术参数
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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：	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：	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 MODULATION	JESD-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 mm	Base Number Matches：	1

LNK305DG 数据手册

LNK302/304-306

KEY FEATURES

TOPOLOGY

BASIC CIRCUIT SCHEMATIC

Low-Side

1. Output referenced to input

2. Positive output (V_O) with respect to +V_IN

3. Step up/down – V_O> V_INor V_O< V_IN

4. Optocoupler feedback

Buck Boost –

Optocoupler

Feedback

LinkSwitch-TN

- Accuracy only limited by reference

choice

V_IN

V_O

- Low cost non-safety rated opto

- No pre-load required

5. Fail-safe – output is not subjected to input

voltage if the internal MOSFET fails

PI-3756-111903

Table 2 (cont). Common Circuit Conﬁgurations Using LinkSwitch-TN.

provides the lowest cost and highest efﬁciency converter. CCM

designs require a larger inductor and ultra-fast (t_rr≤35 ns)

freewheeling diode in all cases. It is lower cost to use a larger

LinkSwitch-TNinMDCMthanasmallerLinkSwitch-TNinCCM

because of the additional external component costs of a CCM

design. However, ifthehighestoutputcurrentisrequired, CCM

should be employed following the guidelines below.

Feedback Diode D2

Diode D2 can be a low-cost slow diode such as the 1N400X

series, however it should be speciﬁed as a glass passivated type

to guarantee a speciﬁed reverse recovery time. To a ﬁrst order,

the forward drops of D1 and D2 should match.

Inductor L1

Choose any standard off-the-shelf inductor that meets the

design requirements. A “drum” or “dog bone” “I” core

inductor is recommended with a single ferrite element due to

its low cost and very low audible noise properties. The typical

inductance value and RMS current rating can be obtained from

the LinkSwitch-TN design spreadsheet available within the

PI Expert design suite from Power Integrations. Choose L1

greater than or equal to the typical calculated inductance with

RMS current rating greater than or equal to calculated RMS

inductor current.

Topology Options

LinkSwitch-TN can be used in all common topologies, with or

withoutanoptocouplerandreferencetoimproveoutputvoltage

tolerance and regulation. Table 2 provide a summary of these

conﬁgurations. For more information see the Application

Note – LinkSwitch-TN Design Guide.

Component Selection

Referring to Figure 5, the following considerations may be

Capacitor C2

helpful in selecting components for a LinkSwitch-TN design.

The primary function of capacitor C2 is to smooth the inductor

current. The actual output ripple voltage is a function of this

capacitor’s ESR. To a ﬁrst order, the ESR of this capacitor

shouldnotexceedtheratedripplevoltagedividedbythetypical

current limit of the chosen LinkSwitch-TN.

Freewheeling Diode D1

Diode D1 should be an ultra-fast type. For MDCM, reverse

recovery time t_rr≤75 ns should be used at a temperature of

70°Corbelow. Slowerdiodesarenotacceptable,ascontinuous

mode operation will always occur during startup, causing high

leading edge current spikes, terminating the switching cycle

prematurely,andpreventingtheoutputfromreachingregulation.

If the ambient temperature is above 70 °C then a diode with

t_rr≤35 ns should be used.

Feedback Resistors R1 and R3

The values of the resistors in the resistor divider formed by

R1 and R3 are selected to maintain 1.65 V at the FB pin. It is

recommended that R3 be chosen as a standard 1% resistor of

2kΩ. Thisensuresgoodnoiseimmunitybybiasingthefeedback

network with a current of approximately 0.8 mA.

For CCM an ultra-fast diode with reverse recovery time

t_rr≤35 ns should be used. A slower diode may cause excessive

leading edge current spikes, terminating the switching cycle

prematurely and preventing full power delivery.

Feedback Capacitor C3

Capacitor C3 can be a low cost general purpose capacitor. It

provides a “sample and hold” function, charging to the output

voltage during the off time of LinkSwitch-TN. Its value should

be 10 μF to 22 μF; smaller values cause poorer regulation at

light load conditions.

Fast and slow diodes should never be used as the large reverse

recovery currents can cause excessive power dissipation in the

diode and/or exceed the maximum drain current speciﬁcation

of LinkSwitch-TN.

²7^-7

Rev. I 11/08

1...4 5 678 9 10...20

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