Datasheet > DI-75

DI-75

更新时间： 2024-11-25 03:29:39

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	352K
描述
Low Cost 2.5 W Regulated Charger/Adapter

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中文翻译

获取价格

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DI-75 数据手册

Design Idea DI-75

LinkSwitch Low Cost 2.5 W

Regulated Charger/Adapter

Application

Device

Power Output

Input Voltage

Output Voltage

Topology

Charger/Adaper

LNK520

2.5 W

85-265 VAC

5.0 V

Flyback

Design Highlights

maintaining the output voltage across C7. The RCD network

of C3, D5, R1 and R2 clamps the ﬂyback voltage across the

primary winding, as the U1-MOSFET turns OFF.

•

Replaces a linear transformer based power supply at the

same or lower cost, with better output regulation

No-loadinputpowerconsumption<300mWat230VAC

input: meets worldwide energy efﬁciency guidelines

Extremely simple circuit – requires only 26 components!

Output voltage (CV) tolerance: ±5% at peak power

point

•

The bias/feedback winding provides U1 with CONTROL pin

current. In CV mode, that current is controlled by the U2-

phototransistor. At start-up and in CC mode, when U2 is OFF,

R5 provides the feedback path. Diode D6 is in the return leg of

thewinding,makingitshieldthecorefromtheprimarywinding.

The bias winding and the primary-to-secondary shield winding

both reduce EMI.

•

Output current (CC) tolerance: ±25% when L ≤ ±10%

Features short-circuit, open loop and thermal protection

Greater than 70% efﬁcient!

Meets EN550022 B EMI without a Y-1 Safety capacitor

Ultra-low leakage current: < 5 µA at 265 VAC input

CONTROL pin capacitor C6 stores energy and supplies it to

U1 at start-up, determines the “restart attempt rate” in the auto-

restart mode, shunts high frequency switching noise around U1

and provides U1 with the instantaneous MOSFET gate-drive

current it requires. The combined voltages of VR1, R7 and the

U2-LED determine the output voltage. Resistor R8 provides

bias current to VR1. The output voltage can be ﬁne-tuned by

adjusting the values of R7 and R8.

Operation

Fusible resistor RF1 gives short-circuit fault protection and

limits start-up inrush current. Inductors L1 and L2 and

capacitorsC1andC2formalow-costpi(π)ﬁlterthatattenuates

conducted EMI. Transformer (T1) winding phasing and D7

orientation let no secondary winding current ﬂow when the

U1-MOSFETisON, sotheprimarywindingcurrentstoresits

energy in the core of T1. When the U1-MOSFET turns OFF,

the energy stored in T1 drives current out of the secondary

winding, forward biasing D7, charging C7 and developing/

LinkSwitch solutions must only operate in discontinuous

conduction mode. P_O~ 0.5 L I f, where P_O= Output Power,

L = transformer primary inductance, I = LinkSwitch

peak current, f = Switching frequency. I²f is accurately

controlled for LinkSwitch; therefore P_Ois proportional to L.

470 pF

500 V

T1 EE13

Lp = 2.40 mH

11DQ06

1.0 mH

D1-D4

1N4005 x 4

330 µF

5.0 V, 0.5 A

RTN

16 V

12T

26 AWG TIW

150 kΩ

114T

35 AWG

100 Ω

1N4007G

4.7 µF

400 V

4.7 µF

400 V

85 - 265

VAC

PC817A

RF1

8.2 Ω

1 W

15 Ω

7.5 kΩ

1 µF

50 V

910 Ω

Fusible

LinkSwitch

120 Ω

Ferrite

Bead

VR1

4.7 V

220 nF

1N4005G

LNK520

PI-3869-051204

Figure 1. 2.5 W LinkSwitch Based Charger/Adapter.

May 2004

DI-75

www.powerint.com

中文翻译

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