Datasheet > DI-26

DI-26

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	65K
描述
7 W Digital Video Broadcast-Terrestrial (DVB-T) Supply

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DI-26 数据手册

Design Idea DI-26

TOP S w it c h^®-GX 7 W Digital Video

Broadcast-Terrestrial (DVB-T) Supply

Topology

Flyback

Device

Power Output

Input Voltage

Output Voltage

Application

DVB-T

7 W

195 to 265 VAC

TOP242P

2.5 V / 3.3 V / 6.2 V / 30 V

Design Highlights

Resistor R12, C10 and L2 filter conducted EMI; R12 is a

flame-proof fusible type, also functioning as a fuse. For

lower cost, if the supply does not have to meet conducted

EMI with the output connected to earth ground, the common

mode choke can be replaced with a π filter. A Zener clamp

(D11andVR1)wasselectedoveranRCDclamptominimize

zero load consumption. Secondary side feedback is taken

fromthe3.3V±5%outputsincethishasthetightesttolerance

requirement. The 2.5 V ±5% output is derived directly from

the 3.3 V output using D4. A 60 V Schottky was selected for

D1, since the slightly higher forward drop centers the 6.2 V

and 30 V outputs.

• Meets CISPR22B/EN55022B conducted EMI limits with

output return grounded

• <0.5 W input power at zero load

• 132 kHz operation and programmable current limit allows

small, low cost EF16 transformer for 7 W output

• Low component count design occupies 80 x 30 x 16 mm

• Integrated soft-start reduces start-up component stresses

Operation

TheTOPSwitch-GXflybacksupplyprovides4outputs,delivering

7 W from a 230 VAC ±15% input. The TOP242P was selected

for low cost, the DIP-8 package removing the need for an

external heat sink. Resistor R7 programs the internal TOP242P

current limit to 78% of nominal, just above the level needed for

full load at low line. This feature allows a more continuous

transformer design for better efficiency and cross-regulation,

without requiring a larger core size.

Post-filters (L1/C3, L2/C12 and R1/C5) reduce output noise

and ripple to <±1% of the respective output voltage. A soft-

finish capacitor (C7) eliminates output turn-on overshoot.

Key Design Points

• The transformer is designed to operate in continuous

mode for tight secondary cross-regulation.

C15 2.2 nF

UF4002

150 Ω

30 V, 5 mA

6.2 V, 0.4 A

10 µF

50 V

4.7 µH

1.8 A

SB140

D7-D10

1N4005

VR1

P6KE200

C12

47 µF

470 µF

10 V

SR506

4.7 µH

1.8 A

35 V

3.3 V, 0.5 A

2.5 V, 1 A

D11

BYW95C

C1, C2

220 µF

6.8 µF

400 V

47 µF

35 V

RTN

1N5400

75 Ω

10 mH

0.1 A

PC817

1 µF

1N4148

15 kΩ

1 kΩ

50 V

TOP S w it c h -GX

TOP242P

C10

0.1 µF

10 kΩ

47 nF

CONTROL

3.3 kΩ

R12

8.2 Ω

Fusible

R11

6.8 Ω

C14

47 µF

10 V

10 µF

16 V

C13

100 nF

LMV431

9.1 kΩ

195-265

VAC

PI-3023-0916102

Figure 1. TOPSwitch-GX 7 W Multiple Output Supply for DVB-T.

September 2002

DI-26

www.powerint.com

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