Datasheet > DI-61

DI-61

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	433K
描述
3 W Charger:

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DI-61 数据手册

Design Idea DI-61

TinySwitch^®-II 3 W Charger:

<200 mW No-load Consumption

Input Voltage

Topology

Device

Power Output

Output Voltage

Application

Flyback

Charger

3 W

85-265 VAC

TNY264P

5 V, 600 mA

The circuit meets CISPR-22 Class B conducted EMI limits

without aYcapacitor,andthereforehasverylowACleakage

current. This EMI performance is achieved via the

TinySwitch-II internal jitter, use of a shield winding, an

output RC snubber, and the primary RCD clamp.

Design Highlights

• Less than 200 mW no-load power consumption (for

115 or 230 VAC input)

• Meets CISPR-22 Class B without Y capacitor

• Low cost, low component count solution

Key Design Points

Operation

• Minimizesecondarycircuitbiascurrents. Uselowcurrent

feedback Zeners for best tolerance. The very low Zener

bias current in this design will provide approximately

10% output voltage tolerance. A precision reference

(e.g. TL431) can be used if higher precision is required.

• Designtransformerwithlowreflectedvoltagetominimize

clamplosses.Alargerdevice(TNY266)mayallowfurther

reduction in V_OR.

• Wind transformer for lowest leakage inductance. Choose

wire gauges to completely fill winding layers.

• Windingthetransformerwithtapebetweenprimarylayers

further reduces intra-winding capacitance and no-load

consumption.

The TinySwitch-II flyback converter in Figure 1 generates a

constant voltage, constant current (CV/CC) 5 V, 600 mA

output. Typical applications include wall-mounted chargers

for cell phones, PDAs and other battery powered portable

equipment.

The key performance characteristic of the circuit shown is the

extremely low no-load consumption of <200 mW. A linear

transformer charger of similar rating will typically consume

1 W to 4 W at no-load. At $0.12/kWh, the TinySwitch-II can

therefore reduce energy costs by $1 to $4 per year.

The no-load performance is achieved by use of TinySwitch-II,

and by careful transformer design.

• Resistor R7 limits the peak current into the optocoupler

LED to prevent damage during unusual transients.

470 pF 33 Ω

11DQ06

5 V, 0.6 A

470 µF

10 V

1.0 mH

Ferrite

Bead

390 pF

1 kV

24 AWG

100 kΩ

4.7 Ω

1.5 kΩ

102T

33 AWG

RF1

8.2 Ω

1.0 W

1N4005 1N4005

15T

2 x 32 AWG

1N4007G

100 µF

2N3906

10 V

T1 EE13

L_P= 1.9 mH

330 Ω

1/2 W

4.7 µF

400 V

85 - 265

VAC

4.7 µF

400 V

VR3

BZX79B5V1

TinySwitch-II

TNY264P

820 Ω

1N4005

Bead

2.2 µH

0.1 µF

50 V

2.4 Ω

2 W

PC817A

RTN

Figure 1. TinySwitch-II 3.0 W Cell Phone Charger.

PI-3681-031204

March 2004

DI-61

www.powerint.com

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