Datasheet > LNK520P

LNK520P

更新时间： 2024-02-10 03:57:32

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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LNK520P 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

LNK520P 数据手册

LNK520

PI-3854-031804

LinkSwitch

LNK520

V_OUT

Typical

Characteristic

V_OUT

V_IN

I_OUT

(a)

(b)

Figure 9. High-side Conﬁguration Using LNK520: (a) Schematic Outline; (b) Typical Output Characteristic Envelope.

To achieve this goal, the minimum voltage feedback threshold

should be set at V_O(MAX). This will ensure that the voltage at the

CC to CV transition point of the inherent characteristic will

alwaysoccurbelowthevoltagefeedbackthreshold.However,the

outputvoltagetoleranceisthenincreased,sincetheinherentCV

characteristic tolerance below V_O(MAX)is added to the tolerance

of the optocoupler feedback circuit.

In this high-side conﬁguration, the SOURCE pins and circuit

board traces form a switching node. Extra care should be taken

to optimize EMI performance. The LNK520 internal MOSFET

switching characteristics have been designed to signiﬁcantly

reduce EMI, particularly in the radiated spectrum (>30 MHz).

However, the SOURCE trace area should be minimized and

EMI ﬁlter components should be distanced from the SOURCE

node whenever possible. In embedded applications where a

high voltage DC input voltage is available, system level EMI

ﬁltering is typically located away from the power supply and

circuit board layout is less critical.

The LNK520 can also be used in the high-side conﬁguration as

shown in Figure 9(a). This conﬁguration provides a very low

component count solution with an approximate CV/CC power

supply output characteristic. A typical output characteristic

envelope is shown in Figure 9(b).

Applications Example

The circuit shown in Figure 10 shows a typical implementation

of an approximate constant voltage / constant current (CV/CC)

charger using LinkSwitch in the low-side conﬁguration. This

design delivers 2.75 W with nominal peak power point voltage

of 5.5 V and a current of 500 mA (Figure 11). Efﬁciency is

greater than 65% over an input range of 85 VAC to 265 VAC.

Thisconﬁgurationisidealforverylowcostchargerandadapter

applications where output CC tolerance is loose or unspeciﬁed.

Typical applications include low cost chargers and adapters

where direct replacement for a linear transformer is required.

In applications with a high voltage DC input voltage, the circuit

is further simpliﬁed with the removal of input rectiﬁers, EMI

ﬁlter choke and input capacitors. Typical applications of this

type include auxiliary supplies in domestic appliances and

industrial applications.

Thebridgerectiﬁer,D1-D4,rectiﬁestheACinput. Therectiﬁed

ACissmoothedbyC1andC2,withinductorL1formingapi-ﬁlter

to ﬁlter differential mode conducted EMI. Resistor RF1 is a

fusible,ﬂameprooftypeprovidingprotectionfromprimary-side

shortcircuitsandlinesurgesandprovidesadditionaldifferential

EMI ﬁltering. The switching frequency of 42 kHz allows such

a simple EMI ﬁlter to be used without the need for aYcapacitor

while still meeting international EMI standards.

In the high-side conﬁguration, the CONTROL pin receives

feedback current through R1 generated by the voltage across

C2. To a ﬁrst order, this voltage is proportional to V_OUTsince

V_OUTis reﬂected to the primary and appears across C2 during

the off time of the LNK520 switching cycle. The output CV

regulationisthereforedeterminedbyhowwellthevoltageacross

C2 tracks the output voltage. This tracking is inﬂuenced by the

value of the transformer leakage inductance, which introduces

an error. This error, which is partially ﬁltered by R2 and C2,

causes a slope in the output CV regulation characteristic.

The LNK520 is optimized for use with a bias winding where

tracking of feedback voltage and output voltage is typically

better than it is in the high-side conﬁguration of Figure 9 (a).

As a consequence, the increased leakage error in the high-side

conﬁguration causes the output current to increase with falling

output voltage, as indicated by the output CC characteristic

envelope in Figure 9 (b).

When power is applied, high voltage DC appears at the DRAIN

pin of LinkSwitch (U1). The CONTROL pin capacitor C5 is

then charged through a switched high voltage current source

connected internally between the DRAIN and CONTROL

pins. When the CONTROL pin reaches approximately

5.6 V relative to the SOURCE pin, the internal current source

is turned off. The internal control circuitry is activated and the

high voltage MOSFET starts to switch, using the energy in C5

to power the IC.

2/05

1...3 4 567 8 9...20

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