Datasheet > DI-39

DI-39

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		DVD
页数	文件大小	规格书
2页	500K
描述
13 W, Universal Input DVD Supply with 70 mW No-load

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DI-39 数据手册

Design Idea DI-39

TOPSwitch-GX 13 W, Universal

Input DVD Supply with 70 mW No-load

Topology

Device

Power Output

Input Voltage

Output Voltage

Application

3.3 V / 5 V / 12 V / -12 V

Flyback

DVD

13 W (17 W pk)

85-265 VAC

TOP244P

Design Highlights

• High efficiency multi-ouptut flyback (77% minimum)

• Topology scalable to higher powers

The supply operates at full frequency at high and medium

power and reduces frequency at light loads. Components D9

and C10 rectify and filter the bias voltage.

• Excellent cross-regulation

TOPSwitch-GX frequency jitter allows conducted EMI

compliance without a common-mode choke, using only

capacitors C1, C4 and inductor L1 as an EMI filter.

• Excellent input no-load consumption <70 mW input

• 132 kHz switching frequency allows smaller transformer

• Frequency jitter eliminates common-mode EMI choke

• >10 dB margin against CISPR22-B conducted EMI with

artificial hand grounding

Components D5 and C2 form a capacitor clamp circuit

absorbingleakageinductanceenergyduringnormaloperation.

ZenerVR1clampsthevoltagetoasafelevelduringabnormal

and transient conditions. After clamping, reverse current

flows through D5, recovering some of the energy. Resistor

R5 limits the reverse current and, with R7, improves EMI by

limitingtheringingonthedrain. Continuousmodeoperation

allows reduced primary and secondary peak currents,

optimizing cross regulation and load regulation by

minimizing leakage inductance induced voltage shifts.

Operation

The TOPSwitch-GX uses current mode feedback to achieve

excellentno-loadstandby.ComponentsC16,R1andQ2provide

a constant current powering the TOPSwitch-GX CONTROL

pin. ResistorR2feedstheremainderofQ2currenttotheMpin,

reducing TOPSwitch-GX current limit with increased current.

Resistor R11 sets the maximum current limit of the device.

Components R6, Q1 and C13 implement slope compensation.

Resistors R15 and R16 share the feedback from the 3.3 V

and 5 V outputs for good cross-regulation.

1 nF

3.3 µH

D1-D4

1N4005

12 V, 400 mA

C15

C20

VR1

P6KE180

UF4003

470 µF

150 µF

3.3 µH

3.15 A

100 Ω

5 V, 1.6 A

3.3 V, 700 mA

RTN

25 V

250 VAC

25 V

33 µF

400V

33 µF

400V

C11

D11

0.01 µF

1 KV

0.047 µF

1800 µF

85 - 265

VAC

1N5822

3.3 µH

25 V

C12

1000 µF

10 V

C18

C17

470 µF

10 V

200 Ω

D10

1N5822

470 µF

47 Ω

10 V

UF4003

U2B

PC817

1N4007

220 µF

25 V

1 kΩ

R16

6.34 kΩ

R15

20 kΩ

R12

1 1/2 W

PC817

U2A

R10

3.3 kΩ

C14

0.1 µF

20 kΩ

10 µF

50 V

TL431CLP

C16

0.33 µF

270 Ω

R13

10 kΩ

TOPSwitch-GX

TOP244P

2N3906

20 kΩ

- 12 V, 100 mA

C10 1N4148

47 µF

CONTROL

C13

47 pF

R11

7.5 kΩ

50 V

R14

6.8 Ω

1.4 µH

0.5 A

C19

0.1 µF

47 µF

10 V

PI-3321-111902

Figure 1. TOPSwitch-GX DVD Player Schematic.

November 2002

DI-39

www.powerint.com

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