Datasheet > DI-80

DI-80

更新时间： 2024-11-25 03:29:39

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		仪表
页数	文件大小	规格书
2页	301K
描述
0.6 W Non-Isolated Utility Meter Power Supply

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DI-80 数据手册

Design Idea DI-80

LinkSwitch-TN 0.6 W Non-Isolated

Utility Meter Power Supply

Application

Device

Power Output

Input Voltage

Output Voltage

Topology

Utility Meter

LNK302

0.6 W

85-265 VAC, 47-63 Hz

12 V, 50 mA

Buck

In meter applications, capacitors C1 and C2 are sized for the

required holdup time to write the meter reading to non-volatile

memory after a power outage.

Design Highlights

•

Universal AC input voltage range

Meets EN62053-21:2003 (<1Wreal and <5VAapparent

input power at 265 VAC)

LinkSwitch-TNuseson/offcontroltoregulatetheoutputvoltage.

When the current into the FEEDBACK (FB) pin exceeds

49 µA, MOSFET switching is disabled for the next switching

cycle. The 49 µA threshold is speciﬁed at an FB pin voltage of

1.65 V (±7% over the entire operating temperature range),

allowing it to be used as a reference.

•

Long holdup time (140/580 ms at 115/230 VAC)

High efﬁciency (>60 % at 265 VAC)

Very low no-load consumption (0.15 W at 265 VAC)

EMI compliant (EN55022B, CISPR-22B)

Extended line surge withstand with integrated 700 V

MOSFET

•

Small size and light weight

ScalableoutputpowerusinglargerLinkSwitch-TNfamily

members

The power processing stage is formed by the LinkSwitch-TN,

freewheelingdiodeD3,outputchokeL1,andtheoutputcapacitor

C5. To a ﬁrst order, the forward voltage drops of D3 and D4

are equal. Therefore, the voltage across C4 tracks the output

voltage. The voltage across C4 is sensed and regulated via the

resistor divider R4 and R3 connected to the LNK302 FB pin.

The values of R3 and R4 are selected such that, at the desired

output voltage, the voltage at the FB pin is 1.65 V. Resistor R5

establishes a small 3.6 mA pre-load and is only necessary for

applications where regulation to zero load is required.

Operation

Using the buck topology, the circuit shown in

Figure1generatesanon-isolated12V, 50mAoutput.Typical

uses include utility meter and industrial and motor control

applications.

The value of L1 is selected according to the LinkSwitch-TN

Design Guide (AN-37) or the PIXIs design spreadsheet (part of

PI Expert^™power supply design software). Both are available

at www.powerint.com.

TheAC input is rectiﬁed and ﬁltered by D1, D2, C1, C2, RF1,

R1, and R2. Two rectiﬁers improve both line surge withstand

(2 kV) and conducted EMI. Resistor RF1 should be a fusible

ﬂameproof type, whereas R1 and R2 can be ﬂameproof only.

100 nF

1.82 kΩ

11.0 kΩ

RF1

8.2 Ω

2 W

220 Ω

0.5 W

1 µF

1N4005GP

12 V,

50 mA

16 V

1.5 mH

130 mA

LinkSwitch-TN

1N4007

4.7 µF

400 V

4.7 µF

400 V

85-265

VAC

3.3 kΩ

LNK302

47 µF

UF4005

16 V

1N4007

RTN

220 Ω

0.5 W

PI-3918-081104

Figure 1. LinkSwitch-TN 0.6 W, 12 V, Universal Input Power Supply Using a Non-Isolated Buck Topology.

September 2004

DI-80

www.powerint.com

中文翻译

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