Datasheet > DI-66

DI-66

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	498K
描述
45 W, Universal Input, LCD Monitor Internal Supply

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DI-66 数据手册

Design Idea DI-66

TOPSwitch^®-GX 45 W, Universal Input,

LCD Monitor Internal Supply

Topology

Device

Output Voltage

Application

Input Voltage

Power Output

Flyback

LCD Monitor

45 W

90-265 VAC

TOP246Y/F

5 V / 12 V

The switching frequency of U1 is set to 66 kHz by connecting

its F pin to the CONTROL pin. Efficient 66 kHz operation

results from the use of an EER3016S core to keep the number

ofprimaryturnslowandtofurtherreduceT1leakageinductance.

This reduces the losses due to both leakage inductance and

winding capacitance. Low leakage inductance also allows the

use of a low cost RCD snubber (C3, R2–R4 and D5) to clamp

the U1 DRAIN voltage, while keeping standby power

consumption low. Use of a glass-passivated normal recovery

diode (D5) recycles the stored leakage energy and increases the

overall efficiency. Resistor R4 dampens drain node ringing,

and is necessary when a normal recovery diode is used.

Design Highlights

• 66 kHz operation enables 0.45 W of standby output

power delivery with 0.9 W of input power at 230 VAC

• Low no-load input power: <0.42 W at 230 VAC

• 82% efficient (min) at 90 VAC input and 45 W output

• Low component count: only 52 parts!

• Meets CISPR22 B EMI with > 10 dB of margin

• No TVS required for the primary snubber

Operation

Many of the built-in features of TOPSwitch-GX, such as line

UV/OV, soft start, line feed-forward, accurate current limit,

and frequency jitter have been used to reduce the component

count,transformersizeandoverallsystemcostofthisuniversal

input, flyback power supply. This design is ideal for LCD

monitorsuppliesthatrequirelowstandbypowerconsumption.

Resistor R5 sets nominal UV and OV limits to 84 V and 378 V,

respectively. Under-voltage lockout protects the supply from

overheating during brownout, and eliminates power-up and

power-downglitches.Overvoltageshutdownprotectsthepower

supply from line surges.

CY3

10n

2.2 nF

68 k

1 kV

1/2 W

R12

68 Ω

470 pF

3.3 uH

12 V/ 3 A

5 V/1.8 A

68 k

2M Ω

1/2 W

D12

MBR20100CT

1/2 W

C11

100 µF

25 V

C10

680 µF

16 V

NEUT

GND

680 µF

16 V

D1-D4

RL205

3.3 uH

1N4007G

CY1

330 pF

6,7

CX1

C15

C12

330 nF

680 µF

D13

SB540

7.5M

1/2 W

C14

10 V

R13

390 Ω

R14

22 Ω

100 µF

C13

25 V

5.3 mH

1 A

680 µF

90-265

VAC

CY2

330 pF

10 V

RTN

8,9

TOPSwitch-GX

TOP246Y

100 µF

400 V

47 µF

50 V

LINE

RT1

D10

LL4148

R15

1.0 kΩ

3.15 A 5/3 A

250 V

CONTROL

PC817C

R16

10.0 kΩ

C16

47 nF

6.8 Ω

330 Ω

R17

47µF

10 V

7.87 kΩ

100 nF

2.2 kΩ

C17

10 µF

35 V

R18

10.0 kΩ

LM431AIM3

6 x 5 mm

Bead Ferrite

PI-3743-120904

Figure 1. Circuit Diagram of a TOP246 Based LCD Monitor Power Supply.

December 2004

DI-66

www.powerint.com

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