Datasheet > DI-34

DI-34

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	63K
描述
5 W Universal Adapter

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DI-34 数据手册

Design Idea DI-34

TinySwitch-II

5 W Universal Adapter

Topology

Flyback

Device

Power Output

Input Voltage

Output Voltage

Application

Adapter

5 W

85-265 VAC

TNY266P

5 V

The TinySwitch-II frequency jitter feature and transformer

construction allow use of a simple filter (L1, L2, C1 and C2)

to meet EMI requirements with L2 used to attenuate high

frequency EMI in the radiated spectrum (>30 MHz). The

circuit also uses a low cost RCD clamp (C7, D5, R3, and R4).

Diode D5 is a Glass Passivated (GP) general purpose diode,

allowing partial recovery of the leakage energy by

recirculating clamp current during the D5 reverse recovery

time, thusimprovingefficiency. ResistorR3reducesEMIby

limiting the peak D5 reverse current and thus softening its

recovery characteristic.

Design Highlights

• Simple design: low parts count (23)

• <300 mW no-load without transformer bias winding

• Frequency jittering reduces EMI - meets EN55022 Class B

withnoYcapacitor:verylowprimary-to-secondaryleakage

current

• ±7% output tolerance with simple Zener reference

• High Frequency (132 kHz) operation allows small, low cost

EE16 transformer

• Built-in thermal shutdown protection

• ON/OFF digital regulation: No analog control loop to

compensate

The combined voltage drops of Zener diode (VR7) and

optocoupler diode (U2) set the output voltage. Resistor R7

biases VR7 according to its specification. The TinySwitch-II

feedbackcurrentisindependentofloadallowing±7%output

voltage tolerance with this simple Zener reference.

Operation

Figure 1 is a simple flyback converter utilizing several

TinySwitch-II built-in features such as switching frequency

jittering, thermal shutdown and auto-restart fault protection.

DuetothedigitalnatureoftheTinySwitch-II controlscheme,

no loop compensation is required. In addition, the current

transfer ratio (CTR) of the optocoupler is not critical and no

DC gain setting resistor in series with VR7 is required.

Typical applications are wall mount adapters and other AC/DC

applications requiring very low cost and small size. The ability

to meet EMI requirements with no Y capacitor makes this

circuitidealforapplicationsrequiringlowprimary-to-secondary

leakage currents.

EE-16

1.0 mH

1.0 nF

1 kV

200 kΩ

1/2 W

1N5822

RF1

8.2 Ω

2 W

5 V, 1.0 A

1N4005 1N4005

100 Ω

3.3 µH

1.0 A

1N4005 GP

1000 µF

470 µF

10 V

6.8 µF

400 V

85 - 265

VAC

6.8 µF

400 V

RTN

TinySwitch

VR7 BZX79C3V9, 2%

TNY266P

1N4005

PC817A

0.1 µF

50 V

150 Ω

Bead

PI-3326-051303

Figure 1. TinySwitch-II – TNY266P, 5 V, 1 A, 5 W Charger-Adapter Power Supply.

May 2003

DI-34

www.powerint.com

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