Datasheet > LNK501G

LNK501G

更新时间： 2024-02-19 02:39:58

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	155K
描述
Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters

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LNK501G 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

LNK501G 数据手册

LNK501

Figure 5 by the addition of R3, C3 and optocoupler U1. R3

forms a potential divider with R1 to limit the U1 collector

emitter voltage.

The characteristics described above provide an approximate

CV/CC power supply output without the need for secondary

side voltage or current feedback. The output voltage regulation

is influenced by how well the voltage across C2 tracks the

reflected output voltage. This tracking is influenced by the

value of the transformer leakage inductance which introduces

an error. Resistor R2 and capacitor C2 partially filter the

leakage inductance voltage spike reducing this error. This

circuitry, used with standard transformer construction

techniques provides much better output load regulation than a

linear transformer, making this an ideal power supply solution

in many low power applications. If tighter load regulation is

required, an optocoupler configuration can be used while still

employing the constant output current characteristics provided

by LinkSwitch.

On the secondary side, the addition of voltage sense circuit

componentsR4,VR1andU1LEDprovidethevoltagefeedback

signal. In the example shown, a simple Zener (VR1) reference

is used though more accurate references may be employed for

improved output voltage tolerancing and cable drop

compensation, if required. R4 provides biasing for VR1. The

regulated output voltage is equal to the sum of the VR1 Zener

voltage plus the forward voltage drop of the U1 LED. R5 is an

optional low value resistor to limit U1 LED peak current due to

output ripple. Manufacturer’s specifications for U1 current and

VR1sloperesistanceshouldbeconsultedtodeterminewhether

R5 is required.

Optional Secondary Feedback

U1 is arranged with collector connected to primary ground and

emitter to the anode of D1. This connection keeps the opto in an

electrically “quiet” position in the circuit. If the opto was

Figure 6 shows a typical power supply outline schematic using

LinkSwitchwithoptocouplerfeedbacktoimproveoutputvoltage

regulation. On the primary side, the schematic differs from

LinkSwitch

OUT

LNK501

85-265

VAC

VR1

RTN

PI-2787-092002

Figure 6. Power Supply Outline Schematic with Optocoupler Feedback.

Output Voltage

Inherent

CC to CV

transition

point

Tolerance envelope

without optocoupler

Typical inherent

characteristic without

optocoupler

Voltage

feedback

threshold

Characteristic with

optocoupler

Load variation

during battery

charging

Output Current

PI-2788-092101

Figure 7. Influence of the Optocoupler on the Power Supply Output Characteristic.

9/02

1 2 345 6 7...20

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