LNK454 Datasheet, PDF (1/12 Pages) Power Integrations, Inc. – LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications

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
Y _{Advanced Performance Features}
• Optimized for non-isolated flyback designs
• Frequency jitter greatly reduces EMI filter size and costs
R • Low dissipation direct sensing of LED current
Advanced Protection and Safety Features
• 725 V integrated MOSFET allows small bulk capacitance and
A _{maximizes power capability}
• Latching shutdown protection for short-circuit / open feedback
and output overvoltage
IN ^{• 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
IM • 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
L • Cycle skipping regulation for abnormally low output power to
clamp peak output current delivered
E Description
The LinkSwitch-PL family enables a very small and low cost
single-stage power factor corrected constant current driver for
R _{solid state lighting. Optimized for direct LED current sensing, the}
LinkSwitch-PL operates over a wide input voltage range
P ^{delivering an output power of up to 16 W. The LinkSwitch-PL}
AC
IN
D ^{LinkSwitch-PL}
CONTROL
BP
S
FB
Figure 1. Basic Application Schematic.
PI-5835-060710
Output Power Table
Product ²
LNK454D
LNK456D
LNK457D/V
LNK458V
LNK460V
85-265 VAC
Minimum Output
Power¹
Maximum Output
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.
Number of
Serial LEDs
1
2
3
350 mA
LNK454
LNK454
LNK456
Output Current
500 mA
LNK454
LNK456
LNK456
700 mA
LNK454
LNK456
LNK457
1000 mA
LNK456
LNK457
LNK458
control algorithm provides flicker-free TRIAC dimming with minimal
4
LNK456
LNK457
LNK458
LNK460
external components.
5
LNK457
LNK458
LNK460
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.
6
LNK457
LNK458
LNK460
7
LNK458
LNK460
8
LNK458
LNK460
9
LNK458
LNK460
10
LNK460
11
LNK460
12
LNK460
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.
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PRELIMINARY
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
June 2010