Datasheet > DI-21

DI-21

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		显示器
页数	文件大小	规格书
2页	68K
描述
45 W, Universal Input, LCD Monitor External Adapter

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DI-21 数据手册

Design Idea DI-21

TOPSwitch^®-GX 45 W, Universal

Input, LCD Monitor External Adapter

Topology

Flyback

Device

Power Output

Input Voltage

Output Voltage

Application

LCD Monitor

45 W

90-265 VAC

TOP247Y

12 V

current limit is further reduced as a function of line voltage

byR4-R6toprovideapproximatelyconstantoverloadpower

vs. line. The larger TOPSwitch-GX selection reduces

conductionlosses,raisingefficiency(withoutcircuitchanges

or increased overload power), and permits a high inductance

design with a small EE30 core for higher efficiency.

Design Highlights

• High efficiency, >82% at 90 VAC

• Low part count solution

• ExtremelylowEMI–frequencyjitterhelpsmeetEN55022B

and FCC B limits with output return grounded

• Low zero load power consumption, <250 mW at 115 VAC

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

power system surge protection

Key Design Points

• Differential and common mode surge immunity to

4 kV (EN61000-4-5)

• 100 kHz ring wave immunity to 4 kV (IEEE C62.41)

• Nominal UV and OV set points are calculated according

to the equations:

V_UV= (50 µA x R1) + 2.5 V, V_OV= (R1 x225 µA) + 2.9 V

• C2 provides high frequency bypass for high voltage DC

bus, reducing high frequency EMI.

• C3 reduces clamp Zener temperature and increases

efficiency. R18 in series with C3 damps drain ringing.

• Ferrite beads, instead of RC snubbers are used on output

rectifier D7 to reduce zero load power consumption.

• L5 and L6 reduce common mode conducted interference

at high frequencies (>10 MHz).

Operation

ThedesigninFigure1utilizestheTOP247Yandtakesadvantage

of many of the device’s features. Line UV and OV (100 V and

450 V, respectively) are implemented using a single 2 MΩ

resistor (R1). Undervoltage eliminates power-up/down output

glitches and overvoltage provides protection for both short

duration transients and long duration power system surges,

removingtheneedforaninputMOV. ResistorR8programsthe

internal current limit of the TOP247Y to 50% of nominal. The

• T1 shield winding (pins 2-3) reduces EMI. R7 damps

ringing caused by shield capacitive currents.

Note: Beads L3 and L4

are placed on D7

anode leads

CY1

2.2 nF

R18

68 Ω

0.5 W

220 Ω

Bead

1T Through

Ferrite Bead

R4-R6

2.7 MΩ

3.3 µH, 5 A

12 V, 3.75 A

C10

VR1

P6KE

200

Bead

C7, C8

100 nF

D1-D4

680 µF

220 µF

35 V

7, 9

RL205

35 V

MBR20100

2 A, 600 V

RTN

10,12

3.15 A

10 mH

1.4 A

4.7 nF

1 kV

100 µF

400 V

20 nF

1 kV

CX1

330 nF

2 MΩ

0.5 W

90-265

VAC

1 µF

50 V

UF4005

LTV817A

1N4148

R13

38.3 kΩ

R11

1 kΩ

t°

TOPSwitch-GX

TOP247Y

RT1

5 Ω, 2.8 A

CONTROL

R10

470 Ω

GND

C11

47 nF

6.8 Ω

100 nF

15 kΩ

3T Ground Wire

Through Ferrite Bead

R12

4.7 kΩ

C12

22 µF

25 V

47 µF

10 V

TL431

R14

10 kΩ

PI-3003-051303

Figure 1. TOPSwitch-GX 45 W LCD Monitor Adapter.

May 2003

DI-21

www.powerint.com

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