Datasheet > LNK501PN

LNK501PN

更新时间： 2024-01-28 22:46:37

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

Atverylightorno-load,typicallylessthan2mAofoutputcurrent,

theoutputvoltagerisesduetoleakageinductancepeakcharging

of the secondary. This voltage rise can be reduced with a small

preload with little change to no-load power consumption.

ratio (a typical V_ORof 50 V requires a diode PIV of 50 V).

Slow recovery diodes are not recommended (1N400X types).

Output Capacitor – C4

Capacitor C4 should be selected such that its voltage and ripple

current speciﬁcations are not exceeded.

The output voltage load variation can be improved across the

whole load range by adding an optocoupler and secondary

reference(Figure6). Thesecondaryreferenceisdesignedtoonly

provide feedback above the normal peak power point voltage

to maintain the correct constant current characteristic.

LinkSwitch Layout considerations

Primary Side Connections

Since the SOURCE pins in a LinkSwitch supply are switching

nodes,thecopperareaconnectedtoSOURCEtogetherwithC1,

C2 and R1 (Figure 5) should be minimized, within the thermal

contraints of the design, to reduce EMI coupling.

Component Selection

The schematic shown in Figure 5 outlines the key components

needed for a LinkSwitch supply.

The CONTROL pin capacitor C1 should be located as close as

possible to the SOURCE and CONTROL pins.

Clamp diode – D1

Diode D1 should be either a fast (t_rr<250 ns) or ultra-fast

type (t_rr<50 ns), with a voltage rating of 600 V or higher. Fast

recovery types are preferred, being typically lower cost. Slow

diodes are not recommended; they can allow excessive DRAIN

ringing and the LinkSwitch to be reverse biased.

To minimize EMI coupling from the switching nodes on the

primary to both the secondary and AC input, the LinkSwitch

shouldbepositionedawayfromthesecondaryofthetransformer

and AC input.

Clamp Capacitor – C2

Routing the primary return trace from the transformer primary

around LinkSwitch and associated components further reduces

coupling.

Capacitor C2 should be a 0.1 µF, 100 V capacitor. Low cost

metallized plastic ﬁlm types are recommended. The tolerance

of this part has a very minor effect on the output characteristic

so any of the standard ±5%, ±10% or ±20% tolerances are

acceptable. Ceramic capacitors are not recommended. The

common dielectrics used such as Y5U or Z5U are not stable

with voltage or temperature and may cause output instability.

Ceramic capacitors with high stability dielectrics may be used

but are expensive compared to metallized ﬁlm types.

Y capacitor

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

transformersecondaryoutputreturnpin(s)andtheprimarybulk

capacitor negative return. Such placement will maximize the

EMI beneﬁt of theYcapacitor and avoid problems in common-

mode surge testing.

CONTROL Pin Capacitor – C1

Quick Design Checklist

Capacitor C1 is used during start-up to power LinkSwitch and

sets the auto-restart frequency. For designs that have a battery

load this component should have a value of 0.22 µF and for

resistive loads a value of 1 µF. This ensures there is sufﬁcient

time during start-up for the output voltage to reach regulation.

Any capacitor type is acceptable with a voltage rating of

10 V or above.

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.

Note: In a LinkSwitch circuit, the SOURCE is a switching

node. This should be taken into consideration during testing.

Oscilloscopemeasurementsshouldbemadewithprobegrounded

to DC voltages such as primary return or DC rail but not to

SOURCE.Powersupplyinputvoltageshouldalwaysbesupplied

using an isolation transformer. The following minimum set of

tests is strongly recommended:

Feedback Resistor – R1

The value of R1 is selected to give a feedback current into the

CONTROL pin of approximately 2.3 mA at the peak output

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

selected during design. Any 1%, 0.25 W resistor is suitable.

1. Maximum drain voltage – Verify that V_DSdoes not exceed

675 V at highest input voltage and peak output power.

Output Diode – D2

Either PN fast, PN ultra-fast or Schottky diodes can be used

depending on the efﬁciency target for the supply, Schottky

diodes giving higher efﬁciency then PN diodes. The diode

voltage rating should be sufﬁcient to withstand the output

voltage plus the input voltage transformed through the turns

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

2/05

1...6 7 8910 11 12...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
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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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