Datasheet > DI-63

DI-63

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	368K
描述
4.8 W CV/CC Charger with Output Cable-Drop Compensation

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DI-63 数据手册

Design Idea DI-63

TinySwitch^®-II 4.8 W CV/CC Charger

with Output Cable-Drop Compensation

Topology

Device

Power Output

Input Voltage

Output Voltage

Application

Flyback

Charger

4.8 W

85-265 VAC

TNY266P

6 V, 800 mA ±7%

Design Highlights

winding, forward biasing D7, charging C7 and developing/

maintaining the output voltage across C7. The V_BEof Q1 and

the V_Zof VR1 determine the CV set point. The voltage across

R4, R5 and the U2-LED determine the CC set point.

• Universal input, no-load consumption < 300 mW

• Meets CISPR-22 Class B EMI without a Y capacitor

• Extremely simple circuit, requires only 32 components!

• Circuit has output cable voltage drop compensation

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

Resistors R7, R10 and diode D6 compensate for output-cable

voltage-drop. The CV portion of the output VI curve is flat,

at the end of the cable, because a current sense resistor (R10)

equal to the DC resistance of the output cable is in the voltage

feedback loop. Diode D6 implements temperature

compensation for the cable drop.

Operation

Fusible resistor RF1 provides short-circuit fault protection and

limitsstart-upinrushcurrent. InductorsL1andL2andcapacitors

C1andC2formalow-costpi(π)filterthatattenuatesconducted

EMI.

The combination of TinySwitch-II frequency jitter, the

outputdiodesnubber(R6andC5),theT1shieldwindingsand

careful primary clamp circuit component selection enable

compliance with CISPR-22, Class B conducted EMI limits,

without a Y-1 Safety capacitor. Eliminating the Y capacitor

gives this circuit very low (< 5 µA) AC leakage current.

Transformer (T1) has two shield windings (1-3 and 1-open)

which reduce the generation of EMI noise. Winding phasing

and D7 orientation let no secondary winding current flow when

the MOSFET in U1 is ON, so primary winding current stores

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

the energy stored in T1 drives current out of the secondary

This circuit is suitable for portable electronics chargers.

1.0 nF

500 V

T1 EE13

_P= 1.25 mH

1 nF

10 Ω

120 Ω

1N4148

1.0 mH

D1-D4

1N4005 x 4

500 V

Ferrite

Bead

6 V, 0.8 A

200 kΩ

R10

0.24 Ω

SB260

RF1

8.2 Ω

1 W

680 µF

1N4007G

Fusible

10 V

2N3906

100 Ω

160 Ω

85-265

VAC

6.8 µF

400 V

6.8 µF

400 V

100 µF

10 V

330 Ω

TinySwitch-II

TNY266P

300 Ω

0.1 µF

50 V

Ferrite

Bead

VR1

BZX79-

B5V1

PC817D

1.35 Ω

2.0 W

RTN

PI-3704-091903

Figure 1. TinySwitch-II Based Charger/Adapter Circuit Diagram.

September 2003

DI-64

www.powerint.com

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