LYT4211-4218/4311-4318
™
LYTSwitch High Power LED Driver IC Family
Single-Stage Accurate Primary-Side Constant Current (CC) Controller with
PFC for Low-Line Applications, TRIAC Dimming and Non-Dimming Options
Product Highlights
•ꢀ Better than ±±5 CC regulation
•ꢀ TRIAC dimmable to less than ±5 output
•ꢀ Fast start-up
•ꢀ <2±0 ms at full brightness
•ꢀ <1s at 105 brightness
•ꢀ High power factor >0.9
•ꢀ Easily meets EN61000-3-2
•ꢀ Less than 105 THD in optimized designs
CONTROL
•ꢀ Up to 925 efficient
•ꢀ 132 kHz switching frequency for small magnetics
High Performance, Combined Driver, Controller, Switch
The LYTSwitch family enables off-line LED drivers with high
power factor which easily meet international requirements for THD
Figure 1. Typical Schematic.
and harmonics. Output current is tightly regulated with better
than ±±5 CC tolerance1. Efficiency of up to 925 is easily
achieved in typical applications.
Optimized for Different Applications and Power Levels
Part Number
LYT4211-LYT4218
LYT4311-LYT4318
Input Voltage Range
8±-132 VAC
TRIAC Dimmable
Supports a Wide Selection of TRIAC Dimmers
The LYTSwitch family provides excellent turn-on characteristics
for leading-edge and trailing-edge TRIAC dimming applications.
This results in drivers with a wide dimming range and fast
start-up, even when turning-on from a low conduction angle.
Large dimming ratio and low “pop-on” current.
No
8±-132 VAC
Yes
Output Power Table1,2
Product6
Minimum Output Power3 Maximum Output Power4
Low Solution Cost and Long Lifetime
LYTSwitch ICs are highly integrated and employ a primary-side
control technique that eliminates the optoisolator and reduces
component count. This allows the use of low-cost single-sided
printed circuit boards. Combining PFC and CC functions into a
single-stage also helps reduce cost and increase efficiency. The
132 kHz switching frequency permits the use of small, low-cost
magnetics.
LYT4x11E/L5
2.± W
2.± W
3.8 W
4.± W
±.± W
6.8 W
8.0 W
18 W
12 W
1± W
18 W
22 W
2± W
3± W
±0 W
78 W
LYT4x12E/L
LYT4x13E/L
LYT4x14E/L
LYT4x15E/L
LYT4x16E/L
LYT4x17E/L
LYT4x18E/L
LED drivers using the LYTSwitch family do not use primary-side
aluminum electrolytic bulk capacitors. This means greatly
extended driver lifetime, especially in bulb and other high
temperature applications.
Table 1. Output Power Table.
Notes:
1. Performance for typical design. See Applications section.
2. Continuous power in an open-frame design with adequate heat sinking; device
local ambient of 70 °C. Power level calculated assuming a typical LED string
voltage and efficiency >805.
3. Minimum output power requires CBP = 47 µF.
4. Maximum output power requires CBP = 4.7 µF.
±. LYT4311 CBP = 47 µF, LYT4211 CBP = 4.7 µF.
6. Package: eSIP-7C, eSIP-7F (see Figure 2).
eSIP-7C (E Package)
Figure 2. Package Options.
eSIP-7F (L Package)
www.powerint.com
February 2013
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