www.power.com

May 2018

Energy-Efficient, Accurate Primary-Side Regulated

CV/CC Switcher for Adapters and Chargers

LinkSwitch-4 Family

This Product is Covered by Patents and/or Pending Patent Applications.

Output Power Table

Product3,4

85 - 265 VAC

Features5

Adapter1

Open Frame2

LNK43x2S

13003 Drive

5 W

LNK40x2S

STD

6.5 W

LNK40x3S

STD

8 W

LNK4323S

STD

8 W

LNK40x3D

STD

10 W

LNK4323D

STD

10 W

LNK40x4D

STD

15 W

LNK4114D

Easy Start

15 W

LNK4214D

Easy Start + Constant Power

15 W

LNK4115D

Easy Start

18 W

LNK4215D

Easy Start + Constant Power

18 W

Table 1. Output Power Table.

Notes:

1. Minimum continuous power in a typical enclosed adapter measured at +50 °C

ambient, 85-265 VAC device T

J ≤ 100 °C.

2. Maximum practical continuous power in an open frame design with adequate

heat sinking, measured at +50 °C.

3. Package: D: SO-8 , S: SOT-23-6.

4. Cable compensation factor. x = 0 (no cable compensation),

x = 1 (3% cable compensation) x = 2 (6% cable compensation).

5. Easy Start feature uses the BJT current to directly charge C

VCC, allowing

start-up into large output capacitors. 13003 drive feature has the gate drive

optimized for maximum efficiency when using 13003 BJTs. Constant power

feature provides 175% of rated current at start-up, allowing start-up into

large output capacitors (see Figure 15). STD are standard products with all

the advanced performance and protection/safety features.

Product Highlights

Dramatically Simplifies CV/CC Converters

•

Eliminates optocoupler and all secondary CV/CC control circuitry

•

Eliminates all control loop compensation circuitry

Advanced Performance Features

•

Dynamic base drive technology provides flexibility in choice of BJT

transistor by dynamically optimizing BJT switching characteristics

•

Extends RBSOA of BJT

•

Dramatically reduces sensitivity to BJT gain

•

Compensates for input line voltage variations

•

Compensates for cable voltage drop

•

Compensates for external component temperature variations

•

Very accurate IC parameter tolerances using proprietary trimming

technology

•

Frequency up to 65 kHz to reduce transformer size

•

The minimum peak current is fixed to improve transient load response

Enhanced Performance Features

•

Easy start for starting into capacitive loads (LNK4114D, LNK4115D)

•

Constant power for high current start-up (LNK4214D, LNK4215D)

•

13003 drive improved efficiency with 13003 BJT’s (LNK4302S,

LNK4322S)

Advanced Protection/Safety Features

•

Single fault output overvoltage and short-circuit

•

Over-temperature protection

•

Active clamp

EcoSmart™– Energy Efficient

•

Meets DoE 6 and CoC V5 2016 via an optimized quasi-resonant

switching PWM/PFM control

•

No-load consumption of <30 mW at 230 VAC input

Green Package

•

Halogen free and RoHS compliant package

Applications

•

Chargers for cell/cordless phones, PDAs, MP3/portable audio

devices, adapters, networking, etc.

Description

The LinkSwitchTM-4 family of ICs dramatically simplifies low power CV/CC

charger design by eliminating an optocoupler and secondary control

circuitry. The LinkSwitch-4 family adaptive BJT drive technology uses

combined base and emitter switching to boost switching performance

and deliver higher efficiency, wider Reverse Bias Safe Operating Area

(RBSOA) margin and the flexibility to accommodate a wide range of low

cost BJT. The device incorporates a multimode PWM/PFM controller

with quasi resonant switch to maximize the efficiency, meets low

no-load power and at same time maintain fast transient response

greater than 4.3 V with a load change from 0% to 100%.

Figure 1. Typical Application (SOT-23-6) (S).

Figure 3. SOT-23-6 and SO-8 Packages.

Figure 2. Typical Application (SO-8) (D).

PI-7462-122315

LinkSwitch-4

U1

LNK4xx2S

~

GND

BD

ED

CS

VCC

FB

+

PI-7464-010815

LinkSwitch-4

U1

LNK40x3D

~

GND

BD

ED

CS

VCC

SBD

FB

+