Datasheet > LNK501PN

LNK501PN

更新时间： 2024-01-23 07:09:21

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	817K
描述
LinkSwitch Family Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters

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LNK501PN 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,	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：	7.78	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-T7	JESD-609代码：	e3
长度：	9.655 mm	功能数量：	1
端子数量：	7	最高工作温度：	125 °C
最低工作温度：	-40 °C	最大输出电流：	0.4 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
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：	46 kHz	温度等级：	AUTOMOTIVE
端子面层：	MATTE TIN	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

LNK501PN 数据手册

LNK501

3. A secondary output of 5 V with a Schottky rectiﬁer diode.

4. Assumed efﬁciency of 70%.

Core gaps should be uniform. Uneven core gapping, especially

with small gap sizes, may cause variation in the primary

inductance with ﬂux density (partial saturation) and make the

constant current region non-linear. To verify uniform gapping

it is recommended that the primary current wave-shape be

examined while feeding the supply from a DC source. The

gradient is deﬁned as di/dt = V/L and should remain constant

throughout the MOSFET on time. Any change in gradient of

the current ramp is an indication of uneven gapping.

5. The part is board mounted with SOURCE pins soldered to

sufﬁcient area of copper to keep the die temperature at or

below 100 °C.

6. An output cable with a total resistance of 0.2 Ω.

In addition to the thermal environment (sealed enclosure,

ventilated, open frame, etc), the maximum power capability

of LinkSwitch in a given application depends on transformer

core size, efﬁciency, primary inductance tolerance, minimum

speciﬁedinputvoltage,inputstoragecapacitance,outputvoltage,

output diode forward drop, etc., and can be different from the

values shown in Table 1.

Measurements made using a LCR bridge should not be solely

reliedupon;typicallytheseinstrumentsonlymeasureatcurrents

of a few milliamps. This is insufﬁcient to generate high enough

ﬂux densities in the core to show uneven gapping.

For a typical EE13 core using center leg gapping, a 0.08 mm

gap (A_LGof 190 nH/t²) allows a primary inductance tolerance of

±10% to be maintained in standard high volume production.

This allows the EE13 to be used in designs up to 2.75 W with

less than 300 mW no-load consumption. If ﬁlm gapping is

used then this increases to 3 W. Moving to a larger core, EE16

for example, allows a 3 W output with center leg gapping.

In designs not required to meet 300 mW no-load consumption,

thetransformercanbedesignedwithhigherV_ORtoextendpower

capability as noted in the following section.

Transformer Design

To provide an approximately CV/CC output, the transformer

should be designed to be discontinuous; all the energy stored

in the transformer is transferred to the secondary during the

MOSFET off time. Energy transfer in discontinuous mode is

independent of line voltage.

The transformer turns ratio should be selected to give a V_OR

(output voltage reﬂected through secondary to primary turns

ratio) of 40 V to 60 V. In designs not required to meet 300 mW

no-load consumption targets, the transformer can be designed

with higher V_ORas long as discontinuous mode operation is

maintained. This increases the output power capability. For

example, a 230 VAC input design using an EE19 transformer

core with V_OR>70 V, is capable of delivering up to 5 W typical

output power. Note: the linearity of the CC region of the power

supply output characteristic is inﬂuenced by V_OR. If this is an

important aspect of the application, the output characteristic

should be checked before ﬁnalizing the design.

Thepeakpowerpointpriortoenteringconstantcurrentoperation

isdeﬁnedbythemaximumpowertransferredbythetransformer.

The power transferred is given by the expression P= 0.5·L_P·I²·f,

whereL_Pistheprimaryinductance,I²istheprimarypeakcurrent

squared and f is the switching frequency.

To simplify analysis, the data sheet parameter table speciﬁes an

I²f coefﬁcient. This is the product of current limit squared and

switchingfrequencynormalizedtothefeedbackparameterI_DCT

This provides a single term that speciﬁes the variation of the

Output Characteristic Variation

peak power point in the power supply due to LinkSwitch.

Boththedevicetoleranceandexternalcircuitgoverntheoverall

tolerance of the LinkSwitch output characteristic. Estimated

peak power point tolerances for a 2.75 W design are ±10% for

voltage and ±20% for current limit for overall variation in high

volume manufacturing. This includes device and transformer

tolerances and line variation. Lower power designs may have

poorer constant current linearity.

As primary inductance tolerance is part of the expression

that determines the peak output power point (start of the CC

characteristic) this parameter should be well controlled. For

an estimated overall constant current tolerance of ±20% the

primary inductance tolerance should be ±10% or better. This

is achievable using standard low cost, center leg gapping

techniques where the gap size is typically 0.08 mm or larger.

Smaller gap sizes are possible but require non-standard, tighter

ferrite A_Ltolerances.

As the output load reduces from the peak power point, the

output voltage will tend to rise due to tracking errors compared

to the load terminals. Sources of these errors include the

output cable drop, output diode forward voltage and leakage

inductance, which is the dominant cause. As the load reduces,

the primary operating peak current reduces, together with the

leakage inductance energy, which reduces the peak charging

of the clamp capacitor. With a primary leakage inductance of

50 µH, the output voltage typically rises 30% over a 100% to

5% load change.

Other gapping techniques such as ﬁlm gapping allow tighter

tolerances (±7% or better) with associated improvements in

the tolerance of the peak power point. Please consult your

transformer vendor for guidance.

2/05

1...5 6 789 10 11...20

中文翻译

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LNK501PN 替代型号

型号	品牌	替代类型	描述	数据表
LNK501P	POWERINT	完全替代	Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters

与LNK501PN相关器件

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LNK520	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
LNK520G	POWERINT	获取价格	Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
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

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