Datasheet > DI-22

DI-22

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
2页	45K
描述
70 W, 19 V External Laptop Adapter

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DI-22 数据手册

Design Idea DI-22

TOP S w it c h^®-GX 70 W, 19 V

External Laptop Adapter

Device

Output Voltage

Application

Power Output Input Voltage

Topology

Flyback

Laptop Adapter

70 W

85-265 VAC

TOP249Y

19 V

Design Highlights

Operation

• High efficiency: 84% at 85 VAC (with 50 ˚C external

ambient temperature)

The design utilizes a TOP249Y in a flyback converter

providing a 70 W output in a sealed enclosure at an external

ambient of 50 ˚C. Line UV and OV (100 V and 450 V,

respectively) are implemented using a single 2 MΩ resistor

(R1). Undervoltage eliminates power-up/down glitches and

overvoltage provides line transient and long duration power

system surge protection. Resistor R10 programs the internal

current limit to 75% of nominal at the UV threshold. As a

function of input voltage the current limit is further reduced

by R9 to provide approximately constant overload power.

The larger TOPSwitch-GX selection reduces conduction

losses,raisingefficiency(withoutcircuitchangesorincreased

overload power) and permits a higher inductance design for

reducedprimaryRMScurrents,furtherincreasingefficiency.

• Low component count and high power density, 7 W/in.³

• Very compact design (4.1 in. × 2.225 in. × 1.06 in.)

• No surface mount components required

• Low zero load power consumption, <370 mW at 115 VAC

• Approximately constant overload power with line voltage

• Line undervoltage detection (UV) and overvoltage (OV)

shutdown

• LowEMI-switchingfrequencyjitterhelpsmeetCISPR22B/

EN55022B limits

• Fully protected for overload, short circuit and thermal faults

C7 2.2 nF

C13

0.33 µF 0.022 µF 0.01 µF

400 V 400 V 400 V

C12

C11

MBR20100

Y1 Safety

MBR20100

VR1

P6KE-

200

820 µF

25 V

C14

0.1 µF

50 V

200 µH

19 V, 3.6 A

RTN

BR1

RS805

UF4006

8 A 600 V

820 µF

270 Ω

25 V

1N4148

820 µH

2 A

R11

2 MΩ

1/2 W

PC817A

31.6 kΩ

4.7 Ω

150 µF

C15

1 µF

50 V

R13

562 Ω

1 kΩ

400 V

0.1 µF

TOP S w it c h -GX

TOP249Y

4.7 nF 50 V

CONTROL

75 µH

RT1

2 A

10 Ω

t°

13 MΩ

C10

1.7 A

6.8 Ω

0.1 µF

50 V

56 kΩ

3.15 A

TL431

R10

4.75 kΩ

0.1 µF

20.5 kΩ

47 µF

16 V

50 V

85-265 VAC

PI-2691-033001

Figure 1. TOPSwitch-GX 70 W Laptop Adapter Schematic.

September 2002

DI-22

www.powerint.com

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