Datasheet > LNK501PN

LNK501PN

更新时间： 2024-01-06 21:18:25

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

instead placed on the cathode side of D1, it would become a

switching node, generating additional common mode EMI

currents through its internal parasitic capacitance.

The extent to which R3 can be increased is limited by opto

transistor voltage and dissipation ratings and should be fully

tested before ﬁnalizing a design. The values of C2 and C3 are

less important other than to make sure they are large enough

to have very little inﬂuence on the impedance of the voltage

division circuit set up by R1, R3 and U1 at the switching

frequency. Normally, the values of C2 and C3 in Figure 6 are

chosen equal to the value of C2 in Figure 5, though the voltage

rating may be reduced depending on the relative values of R1

and R2 discussed above. See Applications section for typical

values of components.

The feedback conﬁguration in Figure 6 is simply a resistive

dividermadeupofR1andR3withD1,R2,C1andC2rectifying,

ﬁlteringandsmoothingtheprimarywindingvoltagesignal.The

optocouplerthereforeeffectivelyadjuststheresistordividerratio

to control the DC voltage across R1 and therefore, the feedback

current received by the LinkSwitch CONTROL pin.

When the power supply operates in the constant current (CC)

region, for example when charging a battery, the output voltage

is below the voltage feedback threshold deﬁned by U1 and

VR1 and the optocoupler is fully off. In this region, the circuit

behaves exactly as previously described with reference to

Figure 5 where the reﬂected voltage increases with increasing

output voltage and the LinkSwitch internal current limit is

adjusted to provide an approximate CC output characteristic.

Note that for similar output characteristics in the CC region,

the value of R1 in Figure 5 will be equal to the value of R1+R3

in Figure 6.

Figure 7 shows the inﬂuence of optocoupler feedback on the

output characteristic. The envelope deﬁned by the dashed lines

represent the worst case power supply DC output voltage and

current tolerances (unit-to-unit and over the input voltage

range) if an optocoupler is not used. A typical example of an

inherent (without optocoupler) output characteristic is shown

dotted. This is the characteristic that would result if U1, R4 and

VR1 were removed. The optocoupler feedback results in the

characteristicshownbythesolidline.Theloadvariationarrowin

Figure7representsthelocusoftheoutputcharacteristicnormally

seen during a battery charging cycle. The two characteristics

are identical as the output voltage rises but then separate as

shown when the voltage feedback threshold is reached. This

is the characteristic seen if the voltage feedback threshold is

above the output voltage at the inherent CC to CV transition

point also indicated in Figure 7.

When the output reaches the voltage feedback threshold set by

U1 and VR1, the optocoupler turns on. Any further increase

in the power supply output voltage results in the U1 transistor

current increasing, which increases the percentage of the

reﬂected voltage appearing across R1. The resulting increase

in the LinkSwitch CONTROL current reduces the duty cycle

according to Figure 4 and therefore, maintains the output

voltage regulation.

Figure 8 shows a case where the voltage feedback threshold is

set below the voltage at the inherent CC to CV transition point.

In this case, as the output voltage rises, the secondary feedback

circuit takes control before the inherent CC to CV transition

occurs. In an actual battery charging application, this simply

limits the output voltage to a lower value.

Normally, R1 and R3 are chosen to be equal in value. However,

increasing R3 (while reducing R1 to keep R1 + R3 constant)

increasesloopgainintheCVregion,improvingloadregulation.

Output Voltage

Tolerance envelope

without optocoupler

Inherent

CC to CV

transition

point

Typical inherent

characteristic without

optocoupler

Voltage

feedback

threshold

V_O(MAX)

Characteristic with

optocoupler

Power supply peak

output power curve

Load variation

during battery

charging

Characteristic observed with

load variation often applied during

laboratory bench testing

Output Current

PI-2790-112102

Figure 8. Output Characteristic with Optocoupler Regulation (Reduced Voltage Feedback Threshold).

2/05

1 2 3 456 7 8...20

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