Datasheet > DI-42

DI-42

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		转换器
页数	文件大小	规格书
2页	44K
描述
Non-isolated Flyback (Buck/Boost) Converter

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DI-42 数据手册

Design Idea DI-42

TinySwitch^®Non-isolated Flyback

(Buck/Boost) Converter

Topology

Buck/Boost

Device

Power Output

Input Voltage

Output Voltage

Application

Appliances

1.2 W

85-265 VAC

TNY254P

12 V

there is no analog control loop to compensate. The low

switching frequency under light and no-load conditions

provides very low power consumption under these

conditions – see Figures 2 and 3.

Design Highlights

• Lowest cost non-isolated flyback converter

• Inherently short circuit & thermal overload protected

• Excellent line and load regulation characteristics

• Operates at 85 ˚C, without forced cooling

• Meets EN61000-4-5 (2 kV line surge – simple

modification provides a 6 kV line surge withstand)

• Input AC line is fed directly to the output

• Available for prototyping in DAK-7

Providing power for driving TRIACs normally requires the

output of the supply to be referenced to the input line as

shown in Figure 1. Therefore, only half-wave rectification

is used and the switch must be in the return or neutral side of

the primary switching circuit. In these applications, EMI

filtering is normally done at the system level and is therefore

not shown here.

Circuit Features

The circuitry shown allows this converter to meet 2 kV surge

requirements according to IEC standards. To extend surge

withstand to 6 kV, an MOV must be added between the Line

input and the node where D3 connects to R2. Additionally,

D3 must be replaced with 100 Ω, 5 W surge-rated resistor

(See DAK-7 for details).

This non-isolated Flyback (Buck-Boost) converter has been

implemented using a TinySwitch TNY254P, which minimizes

cost, PCB space and design time.

The most typical application for the circuit of Figure 1 is

poweringaTRIAC driveandassociatedcircuitry,inaconsumer

or industrial appliance, having TRIAC controlled motors.

The high efficiency of this converter (see Figure 4) allows

thecircuittooperatetoveryhighambienttemperaturesofup

to85˚C,assometimesspecifiedinhouseholdappliancesand

industrial applications.

The combined voltage drops of Zener diode (VR1) and

optocouplerdiode(U2)settheoutputvoltage.Duetothe digital

nature of the TinySwitch output voltage regulation scheme, the

currenttransferratio(CTR)oftheoptocouplerisnotcriticaland

+12 VDC

UF4005

220 uF

25 V

VR1

1N5342B

6.8 uF

400 V

1.5 mH

85 - 265

VAC

TinySwitch

180 Ω, 3 W

Fusible

1N4007

TNY254P

0.1 uF

50 V

BP EN

SFH615-2

PI-3280-090502

Figure 1. TinySwitch – TNY254P, 1.2 W, 12 V 100 mA.

DI-42

September 2002

www.powerint.com

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