Datasheet > DI-23

DI-23

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		调制解调器
页数	文件大小	规格书
2页	512K
描述
10 W, Multi-output, High Speed Modem Power Supply

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DI-23 数据手册

Design Idea DI-23

TOPSwitch^®-GX 10 W, Multi-output,

High Speed Modem Power Supply

Topology

Device

Power Output

Input Voltage

Output Voltage

Application

Flyback

High Speed Modem

10 W

85-264 VAC

TOP243P

3.3 V / 5 V / 30 V

Typicalapplicationsarewallmountadapters,set-topbox,high-

speed modem, standby power supplies, and other applications

requiring very low cost, small size, and low

no-load input power consumption.

Design Highlights

• Compact low cost design (113 mm × 39 mm × 25 mm) with

only 46 parts

• Meets Blue Angel no-load power consumption

• Line undervoltage protection prevents turn-off output

glitches and overvoltage protection provides extended line

surge protection

• Hysteretic thermal shutdown provides automatic fault

recovery

• Frequency jittering dramatically reduces EMI and meets

EN550022 Class B without Y1 capacitor

• Ultra low leakage current (<1 µA at 265 VAC) eliminates

audio hum in voice applications

• Surge immunity to 4 kV (EN61000-4-5)

• High efficiency >70%

TheexamplediscussedherepassesEMIconductedandradiated

emissions tests without using a Y1 capacitor between primary

and secondary. This is possible with the frequency jittering

featureofTOPSwitch-GXandcarefultransformerconstruction.

Shield windings are used in the transformer to reduce common

mode EMI currents. Transformer specifications are given in

Table 1.

Good cross-regulation of output voltages is achieved by careful

transformer construction and using a TL431 voltage regulator

instead of a Zener regulator.

The power supply uses a low cost RCD clamp with a slow

1N4007GP diode, which reduces EMI emissions and recycles

leakageenergy,increasingefficiency.Inputlinesensingprevents

reverse conduction of current in TOPSwitch-GX at very low

input voltages due to the 1N4007GP in the RCD clamp.

Operation

TOP243P (DIP package) is shown in Figure 1. The power

supplyutilizesmanyTOPSwitch-GXfeaturessuchasfrequency

jittering,inputvoltagesense,thermalshutdown,internalcurrent

limit, soft-start, etc. without adding any extra components.

10 µH

10 Ω

UF4003

0.03 A, 30 V

0.9 A, 5 V

C10

10 µF

50 V

47 µF

50 V

3.3 µH

SB360

1 nF

1 kV

150 kΩ

0.5 W

100 µF

10 V

D1-D4

1N4007

1 A, 1000 V

SB540

3.3 µH

R13

12 kΩ

820 µF

10 Ω

1.5 A, 3.3 V

RTN

16 V

100 Ω

C13

2.2 nF

820 µF

16 V

820 µF

150 µF

16 V

6.3 V

75 Ω

1N4007GP

1N4148

C11

20 mH

0.8 A

0.1

LTV817A

33 µF

400V

C15

1 kΩ

EE25

R10

R11

0.1 µF

250 VAC

2 MΩ

15.4 kΩ

10 kΩ

TOPSwitch-GX

C10

0.1 µF

CONTROL

TOP243P

3.15 A

C14

6.8 Ω

1 µF

50 V

LM431BCZ

47 µF

10 V

R12

10 kΩ

85 - 265

VAC

PI-3366-120704

Figure 1. TOP243P – 10 W, 3.3 V at 1.5 A, 5 V at 0.9 A, 30 V at 0.03 A, High Speed Modem Power Supply.

December 2004

DI-23

www.powerint.com

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