Datasheet > LNK306P

LNK306P

更新时间： 2024-01-01 12:57:36

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		开关
页数	文件大小	规格书
16页	864K
描述
Lowest Component Count, Energy Efficient Off-Line Switcher IC

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LNK306P 技术参数

生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP,	针数：	8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.6
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制技术：	PULSE WIDTH MODULATION
JESD-30 代码：	R-PDIP-T8	长度：	9.575 mm
功能数量：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-20 °C
最大输出电流：	1.4 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	认证状态：	Not Qualified
表面贴装：	NO	切换器配置：	BUCK
最大切换频率：	70 kHz	温度等级：	COMMERCIAL EXTENDED
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	宽度：	6.35 mm
Base Number Matches：	1

LNK306P 数据手册

LNK302/304-306

LinkSwitch-TN

RF1

INPUT

OUTPUT

Optimize hatched copper areas (

) for heatsinking and EMI.

PI-3750-083004

Figure 6. Recommended Printed Circuit Layout for LinkSwitch-TN in a Buck Converter Conﬁguration.

cycles are skipped. To provide overload protection if no cycles

LinkSwitch-TN Selection and Selection Between

are skipped during a 50 ms period, LinkSwitch-TN will enter

auto-restart (LNK304-306), limiting the average output power

to approximately 6% of the maximum overload power. Due to

trackingerrorsbetweentheoutputvoltageandthevoltageacross

C3 at light load or no load, a small pre-load may be required

(R4). For the design in Figure 5, if regulation to zero load is

required, then this value should be reduced to 2.4 kΩ.

MDCM and CCM Operation

SelecttheLinkSwitch-TNdevice,freewheelingdiodeandoutput

inductor that gives the lowest overall cost. In general, MDCM

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.

Key Application Considerations

LinkSwitch-TN Design Considerations

Output Current Table

Topology Options

Data sheet maximum output current table (Table 1) represents

the maximum practical continuous output current for both

mostlydiscontinuousconductionmode(MDCM)andcontinuous

conductionmode(CCM)ofoperationthatcanbedeliveredfrom

a given LinkSwitch-TN device under the following assumed

conditions:

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.

1) Buck converter topology.

Component Selection

2) The minimum DC input voltage is ≥70 V. The value of

input capacitance should be large enough to meet this

criterion.

3) For CCM operation a KRP* of 0.4.

4) Output voltage of 12 VDC.

Referring to Figure 5, the following considerations may be

helpful in selecting components for a LinkSwitch-TN design.

Freewheeling Diode D1

5) Efﬁciency of 75%.

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.

6) A catch/freewheeling diode with t_rr≤75 ns is used for

MDCM operation and for CCM operation, a diode with

t_rr≤35 ns is used.

7) The part is board mounted with SOURCE pins soldered

to a sufﬁcient area of copper to keep the SOURCE pin

temperature at or below 100 °C.

*KRP is the ratio of ripple to peak inductor current.

For CCM an ultra-fast diode with reverse recovery time

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

3/05

1 2 3 456 7 8...16

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