LNK454/456-458/460

LinkSwitch-PL Family

www.powerint.com

June 2010

LED Driver IC with TRIAC Dimming, Single-Stage PFC and

Constant Current Control for Non-Isolated Applications

®

This document contains information on a new product. Specifications and information herein

are subject to change without notice.

PRELIMINARY

Output Power Table

85-265 VAC

Minimum Output

Maximum Output

LNK454D

1.5 W

3 W

LNK456D

3 W

6 W

LNK457D/V

4 W

8 W

LNK458V

6 W

11.5 W

LNK460V

8 W

16 W

Table 1. Output Power Table.

Notes:

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

heat sinking, measured at +50 °C ambient (see Key Applications Considerations

for more information).

2. Packages: D: SO-8C, V: eDIP-12.

Output Current

Number of

Serial LEDs

350 mA

500 mA

700 mA

1000 mA

1

LNK454

LNK454

LNK454

LNK456

2

LNK454

LNK456

LNK456

LNK457

3

LNK456

LNK456

LNK457

LNK458

4

LNK456

LNK457

LNK458

LNK460

5

LNK457

LNK458

LNK460

6

LNK457

LNK458

LNK460

7

LNK458

LNK460

8

LNK458

LNK460

9

LNK458

LNK460

10

LNK460

11

LNK460

12

LNK460

Product Highlights

Dramatically Simplifies Off-line LED Drivers

•

Single stage power factor correction and accurate constant

current (CC) output

•

Flicker-free phase-controlled TRIAC dimming

•

Very low component count with small non-electrolytic bulk

capacitor, for compact replacement lamp designs

•

Compact SO8 package

•

Completely eliminates control loop compensation

Advanced Performance Features

•

Optimized for non-isolated flyback designs

•

Frequency jitter greatly reduces EMI filter size and costs

•

Low dissipation direct sensing of LED current

Advanced Protection and Safety Features

•

725 V integrated MOSFET allows small bulk capacitance and

maximizes power capability

•

Latching shutdown protection for short-circuit / open feedback

and output overvoltage

•

Auto-restart for overload condition

•

Hysteretic thermal shutdown

•

Meets high-voltage creepage between DRAIN and all other pins

both on PCB and at package

•

High power factor optimizes system lumen per watt by

reducing input VA

•

Control algorithm balances switching and conduction losses

over line and load to maintain optimum efficiency

•

Cycle skipping regulation for abnormally low output power to

clamp peak output current delivered

Description

The LinkSwitch-PL family enables a very small and low cost

single-stage power factor corrected constant current driver for

solid state lighting. Optimized for direct LED current sensing, the

LinkSwitch-PL operates over a wide input voltage range

delivering an output power of up to 16 W. The LinkSwitch-PL

control algorithm provides flicker-free TRIAC dimming with minimal

external components.

Each device incorporates a 725 V rated power MOSFET, a novel

discontinuous mode variable frequency variable on-time controller,

frequency jitter, cycle by cycle current limit and hysteretic thermal

shutdown in a monolithic 4-pin IC, available in SO-8C and

eDIP-12 packages.

Figure 1.

Basic Application Schematic.

Figure 2.

Device Selection based on Length of Output LED Series String and

Current. A Typical Voltage Drop of 3.5 V per LED is Assumed.

D

S

BP

CONTROL

FB

PI-5835-060710

LinkSwitch-PL

AC

IN