Document
www.DataSheet4U.com
LNK454/456-458/460 LinkSwitch-PL Family
®
LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications
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
PR EL IM IN AR Y
D CONTROL S FB
AC IN
LinkSwitch-PL
BP
PI-5835-060710
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 EcoSmart ® - Energy Efficient • 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
Figure 1.
Basic Application Schematic.
Output Power Table
Product 2
LNK454D LNK456D LNK457D/V LNK458V LNK460V
85-265 VAC Minimum Output Maximum Output Power1 Power1 1.5 W 3W 3W 6W 4W 8W 6W 11.5 W 8W 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.
Description
Output Current
700 mA LNK454 LNK456 LNK457 LNK458 LNK460 LNK460 1000 mA LNK456 LNK457 LNK458 LNK460
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.
Number of Serial LEDs 1 2 3 4 5 6 7 8 9 10 11 12
350 mA
500 mA
LNK454 LNK454 LNK456 LNK456 LNK457 LNK457 LNK458 LNK458 LNK458 LNK460 LNK460 LNK460
LNK454 LNK456 LNK456 LNK457 LNK458 LNK458 LNK460 LNK460 LNK460
Figure 2.
Device Selection bas.