LNK623-626

LinkSwitch-CV Family

www.powerint.com

September 2009

Energy-Efficient, Off-line Switcher with Accurate

Primary-side Constant-Voltage (CV) Control

®

Output Power Table

230 VAC ±15%

85-265 VAC

Peak or

Open

Peak or

Open

LNK623PG/DG

6.5 W

9 W

5.0 W

6 W

LNK624PG/DG

7 W

11 W

5.5 W

6.5 W

LNK625PG/DG

8 W

13.5 W

6.5 W

8 W

LNK626PG/DG

10.5 W

17 W

8.5 W

10 W

Table 1.

Output Power Table. Based on 5 V Output.

Notes:

1. Minimum continuous power in a typical non-ventilated enclosed adapter

measured at +50 °C ambient.

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

heatsinking, measured at 50 °C ambient (see Key Application Considerations

section for more information).

3. Packages: P: DIP-8C, D: SO-8C.

Product Highlights

Dramatically Simplifies CV Converters

•

Eliminates optocoupler and all secondary CV control circuitry

•

Eliminates bias winding supply – IC is self biasing

Advanced Performance Features

•

Compensates for external component temperature variations

•

Very tight IC parameter tolerances using proprietary trimming

technology

•

Continuous and/or discontinuous mode operation for design

flexibility

•

Frequency jittering greatly reduces EMI filter cost

•

Even tighter output tolerances achievable with external resistor

selection/trimming

Advanced Protection/Safety Features

•

Auto-restart protection reduces delivered power by >95% for

output short circuit and all control loop faults (open and shorted

components)

•

Hysteretic thermal shutdown – automatic recovery reduces

power supply returns from the field

•

Meets HV creepage requirements between Drain and all other

pins, both on the PCB and at the package

•

No-load consumption <200 mW at 230 VAC and down to

below 70 mW with optional external bias

•

Easily meets all global energy efficiency regulations with no

added components

•

ON/OFF control provides constant efficiency down to very light

loads – ideal for mandatory EISA and ENERGY STAR 2.0

regulations

•

No primary or secondary current sense resistors – maximizes

efficiency

Green Package

•

Halogen free and RoHS compliant package

Applications

•

DVD/STB

•

Adapters

•

Standby and auxiliary supplies

•

Home appliances, white goods and consumer electronics

•

Industrial controls

Description

The LinkSwitch-CV dramatically simplifies low power, constant

voltage (CV) converter design through a revolutionary control

technique which eliminates the need for both an optocoupler and

secondary CV control circuitry while providing very tight output

voltage regulation. The combination of proprietary IC trimming

and E-Shield™ transformer construction techniques enables

Clampless™ designs with the LinkSwitch-CV LNK623/4.

Figure 1.

Typical Application Schematic (a) and Output Characteristic Envelope (b).

*Optional with LNK623-624PG/DG. (see Key Application Considerations section for

clamp and other external circuit design considerations).

LinkSwitch-CV

*

Wide Range

HV DC Input

PI-5195-080808

D

S

FB

BP

(a) Typical Application Schematic

(b) Output Characteristic

LinkSwitch-CV provides excellent cross-regulation for multiple-

output flyback applications such as DVDs and STBs. A 700 V

power MOSFET and ON/OFF control state machine, self-biasing,

frequency jittering, cycle-by-cycle current limit, and hysteretic

thermal shutdown circuitry are all incorporated onto one IC.

I

O

V

O

±5%

Auto-Restart

PI-5196-080408