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
•
Flicker-free phase-controlled TRIAC dimming
•
Single stage power factor correction and accurate constant
current (CC) output
•
Very low component count with small non-electrolytic bulk
capacitor for compact replacement lamp designs
•
Compact SO8, eSOP, and eDIP packages
•
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
•
Cycle skipping regulation for abnormally low output power to
clamp peak output current delivered
•
725 V integrated power MOSFET allows small bulk capacitance
and maximizes power capability
•
Short-circuit, overload, open feedback and output overvoltage
protection
•
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 input VA
•
Control algorithm balances switching and conduction losses
over line and load to maintain optimum efficiency
Figure 1.
AC
IN
D
LinkSwitch-PL
CONTROL
BP
S
FB
PI-5835-060710
Basic Application Schematic.
Output Power Table
Product
2
LNK454D
LNK456D
LNK457D/K/V
LNK458K/V
LNK460K/V
85-265 VAC
Minimum Output
Maximum Output
Power
Power
1
1.5 W
3W
3W
6W
4W
8W
6W
11.5 W
8W
16 W
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, eSOP-12,
and eDIP-12 packages.
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, K: eSOP-12, V: eDIP-12.
Output Current
Number of
Serial LEDs
1
2
3
4
5
6
7
8
9
10
11
12
Figure 2.
350 mA
LNK454
LNK454
LNK456
LNK456
LNK457
LNK457
LNK458
LNK458
LNK458
LNK460
LNK460
LNK460
500 mA
LNK454
LNK456
LNK456
LNK457
LNK458
LNK458
LNK460
LNK460
LNK460
700 mA
LNK454
LNK456
LNK457
LNK458
LNK460
LNK460
1000 mA
LNK456
LNK457
LNK458
LNK460
Device Selection Based on Length of Output LED Series String and
Current. A Typical Voltage Drop of 3.5 V per LED is Assumed.
www.powerint.com
November 2010
POWERINT [ POWER INTEGRATIONS, INC. ]
