I

O

I

R

V

R

V

O

Rated Output Power = V

PI-3924-011706

Figure 1. Typical Application – not a Simplified Circuit (a) and

Output Characteristic Envelope (b).

Product Highlights

Lowest System Cost and Advanced Safety Features

•

Lowest component count switcher

•

Very tight parameter tolerances using proprietary IC

trimming technology and transformer construction

techniques enable Clampless™designs – decreases

component count/system cost and increases efficiency

•

Meets industry standard requirements for thermal overload

protection – eliminates the thermal fuse used with linear

transformers or additional components in RCC designs

•

Frequency jittering greatly reduces EMI – enables low cost

input filter configuration

•

Meets HV creepage requirements between DRAIN and all

other pins, both on the PCB and at the package

•

Proprietary E-Shield™ transformer eliminates Y-capacitor

Superior Performance over Linear and RCC

•

Hysteretic thermal shutdown protection – automatic

recovery improves field reliability

•

Universal input range allows worldwide operation

•

Auto-restart reduces delivered power by >85% during

short circuit and open loop fault conditions

•

Simple ON/OFF control, no loop compensation needed

•

High bandwidth provides fast turn on with no overshoot

and excellent transient load response

•

Easily meets all global energy efficiency regulations with

no added components

•

No-load consumption <150 mW at 265 VAC input

•

ON/OFF control provides constant efficiency to very

light loads – ideal for mandatory CEC regulations

Applications

•

Chargers for cell/cordless phones, PDAs, power tools,

MP3/portable audio devices, shavers etc.

•

Standby and auxiliary supplies

Description

LinkSwitch-LP switcher ICs cost effectively replace all

unregulated isolated linear transformer based (50/60 Hz) power

supplies up to 3 W output power. For worldwide operation, a

single universal input design replaces multiple linear transformer

based designs.The self-biased circuit achieves an extremely low

no-load consumption of under 150 mW. The internal oscillator

frequency is jittered to significantly reduce both quasi-peak and

average EMI, minimizing filter cost.

®

Table 1. Output Power Table.

Notes:

1. Output power may be limited by specific application parameters

including core size and Clampless operation (see Key Application

Considerations).

2. Minimum continuous power in a typical non-ventilated enclosed

adapter measured at 50 °C ambient.

3. Minimum practical continuous power in an open frame design with

adequate heat sinking, measured at 50 °C ambient.

4. Packages: P: DIP-8B, G: SMD-8B, D: SO-8C. For lead-free

package options, see Part Ordering Information.

230 VAC ±15%

85-265 VAC

Open

Open

LNK562P/G/D

1.9 W

1.9 W

1.9 W

1.9 W

LNK563P/G/D

2.5 W

2.5 W

2.5 W

2.5 W

LNK564P/G/D

3 W

3 W

3 W

3 W

(a)

(b)

+

D

S

FB

BP

DC

Output

AC

IN

LinkSwitch-LP

PI-3923-092705

LNK562-564

LinkSwitch-LP

Energy Efficient Off-Line Switcher IC for

Linear Transformer Replacement

November 2008