Datasheet > DI-117

DI-117

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	263K
描述
15 W, 12 V Adapter with <100 mW No-Load Consumption

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DI-117 数据手册

Design Idea DI-117

TinySwitch-III

15 W, 12 V Adapter with <100 mW No-Load Consumption

Application

Device

Power Output Input Voltage Output Voltage Topology

15 W 90-265 VAC 12 V Flyback

Adapters / General Purpose TNY279P

The internal MOSFET in U1 conducts current through

the primary winding of T1 during each enabled switching

cycle. When the primary current reaches the MOSFET

current limit, the controller turns it off, and the energy

in T1 is transferred to the output. Schottky diode D7 and

capacitor C8 rectify and ﬁlter the output. Inductors L3 and

capacitor C9 attenuate the switching ripple on the output.

Capacitor C3 selects the standard current limit of U1. For

higher efﬁciency, the next larger (TNY280P) device may

be used. In this case, the value of C3 would be changed to

1 µF, selecting the reduced current limit for the larger device,

but no other circuit changes would be required.

Design Highlights

•

Simple, low cost, low parts count solution

Low input power at no-load: <100 mW at 265 VAC

High efﬁciency >81% at 90 VAC

Meets CEC requirements for active mode efﬁciency

(79 % vs. 73.5 % requirement)

•

>10 dBµV margin to EN55022B conducted EMI limits

Simple, primary-side output overvoltage latching shut-

down protects load under fault conditions

•

Low line frequency leakage current <10 µA

Operation

The primary clamp (D5, R1, C5, R5 and R6) limits the

maximum peak drain voltage below the 700 V breakdown

voltage of U1's internal MOSFET. Resistor R1 dampens the

high-frequency ringing of the T1 leakage inductance.

The TNY279 (U1) in the 8-pin DIP package selected for the

ﬂyback design in Figure 1 is ideal for adapter applications.

The arrangement of the four SOURCE pins on one side of

the package allows a small metal heatsink to be inserted.

This allows the device to operate in a sealed adapter with an

external ambient of 40 °C.

C11

1 nF

68 pF

250 VAC

20 Ω

100 V

Ferrite Bead

3.5 × 7.6 mm

1 mH

1 nF

+12 V, 1.25 A

1 kV 240 kΩ 240 kΩ

680 µF

25 V

220 µF

25 V

SB580

1N4005GP

3.15 A

1N4005

RTN

10 µF

400 V

22 µF

400 V

100 Ω

1N4148

90-265

VAC

56 Ω

EF20

FR107

1 µF

50 V

1N4005GP

1N4005

VR3

BZX79-B6V8

6.8 V

3.3 µH

1 kΩ

47 Ω

U2-B

TinySwitch-III

TNY279P

R11

39 kΩ

10 kΩ

EN/UV

BP/M

100 Ω

C10

R10

220 nF 3 kΩ

50 V

LM431

100 nF

50 V

U2-A

PC817A

33 pF

1 kV

R12

10 kΩ

PI-4417-051106

Figure 1. 15 W, 12 V Output Supply Using TNY279P.

September 2006

DI-117

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