LYT5216-5228
LYTSwitch-5 Family
Single-Stage LED Driver IC with Combined PFC and Constant Current
Output in Isolated and Non-Isolated Topologies
Product Highlights
Combined Single-Stage PFC + Accurate CC Output
•
•
•
•
•
Accurate CC, better than ±3%
Power Factor >0.9
Low THD, <10% with typical input and output conditions
>90% efficient in optimized designs
High switching frequency and DCM allow compact magnetics
LYTSwitch-5
Design Flexibility
L
D
CONTROL
DS
DO
• Supports buck, buck-boost, tapped-buck, boost, isolated and
BP
FB
OC
S
non-isolated flyback topologies
• 2 MOSFET voltage options and 3 power levels for optimum device
selection
PI-7711-121015
Highest Reliability
Figure 1a. Typical Application Schematic: Isolated Flyback.
• No electrolytic bulk capacitors or optoisolators for increased lifetime
• Comprehensive protection features
• Input and output overvoltage
• Open-loop protection
• Advanced thermal control
• Thermal foldback allows output light delivery at abnormally high
ambient temperatures
• Hysteretic shutdown provides protection during fault conditions
LYTSwitch-5
Description
The combination of a low-side switching topology, cooling via electronically quiet SOURCE pins and frequency jitter ensures extremely low EMI.
This reduces the size of the input filter components – greatly reducing
audible noise.
The part numbers shown in Table 1 describe 3 different power levels and
two MOSFET voltage options to cost-optimize designs, while EcoSmart™
switching technology ensures maximum efficiency for each device size
and load condition.
D
DO
The LYTSwitch™-5 family is ideal for single-stage power factor
corrected constant current LED applications – bulbs, tubes and
ballasts.
Each device incorporates a high-voltage power MOSFET and discontinuous mode, variable frequency, variable on-time controller. The
controller also provides fast (cycle-by-cycle) current limit, input and
output OVP, plus advanced thermal management circuitry.
L
CONTROL
DS
FB
BP
OC
S
PI-7799-121015
Figure 1b. Typical Application Schematic: Non-Isolated Buck.
Output Power Table
Product2
Output Power1
LYT5225D
90-308 VAC
9W
LYT5216D, LYT5226D
16 W
LYT5218D, LYT5228D
25 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. Package: D: SO-16B.
Figure 2. SO-16B (D Package).
www.power.com
March 2016
This Product is Covered by Patents and/or Pending Patent Applications.
