Datasheet > DI-119

DI-119

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		电话
页数	文件大小	规格书
2页	536K
描述
Cordless Phone Linear Adapter Replacement with 10 kV Surge Withstand

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DI-119 数据手册

Design Idea DI-119

LinkSwitch-LP

Cordless Phone Linear Adapter Replacement

with 10 kV Surge Withstand

Application

Device

Power Output Input Voltage Output Voltage

1.6 W 85-265 VAC 7.7 V, 210 mA

Topology

Cordless Phone/Adapter

LNK562P

Flyback

Design Highlights

TheLNK562device(U1)providesprimarysidesensedoutput

voltage and current regulation, eliminating the need for an

optocoupler. Using the PI Transformer Designer software,

shield windings were included in the transformer design.

This allowed the circuit to meet EN55022 B conducted EMI

limits without the use of a Y-rated safety capacitor bridging

the primary to secondary isolation barrier.

• Simple, low-cost, low parts count CV/CC solution

• Low no-load input power: <180 mW at 265 VAC

• Dramatically improved regulation over line frequency

linear transformer

• Meets CEC / ENERGY STAR requirements for active

mode efﬁciency (63% vs. 53% requirement)

• Small, low-cost EE16 core size allows compact design

• >15 dBµV margin to EN55022B conducted EMI limits

• No Y-capacitor gives low (<10 µA) line frequency

leakage current

The AC input is rectiﬁed and ﬁltered by D1, D2 and C1,

C6. The input capacitance is split to form a π ﬁlter with

L1 and L3, with R5 damping the self resonance. Varistor

RV1 provides surge protection for differential surges while

RF1 provides ﬁltering and fusing. The internal MOSFET of

U1 drives the transformer primary, but the normal primary

clamp network is not required due to the low current limit of

U1. Skipping switching cycles based on the voltage sensed

from the bias winding provides output regulation. Should

the output of the supply be overloaded, then U1 lowers the

switching frequency to limit the output current until ~2 V,

when the unit enters auto-restart.

• Meets 10 kV common mode and 2 kV differential mode

surge (EN 1000-4-5 Class 4)

Operation

Supplies for cordless phones or answering machines often

require a 10 kV common mode surge withstand capability

to prevent damage to the telephone network during local

lightning strikes. The design shown in Figure 1 meets this

requirement while still being simple and low cost.

RF1

1 mH

1N4937

1N4933

10 Ω

100 µF

2.5 W

25 V

7.7 V, 210 mA

J3-1

4.7 kΩ

J3-2

4.7 kΩ

RTN

85-265

VAC

RV1

275 VAC

10 µF

50 V

3.3 µF 3.3 µF

400 V 400 V

EE16

4.7 kΩ

1N4005

1 mH

100 kΩ

22.1 kΩ

LinkSwitch-LP

LNK562

3.01 kΩ

100 nF

50 V

PI-4491-092806

Figure 1. LNK562 Linear Adapter Replacement Schematic.

September 2006

DI-119

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