LYT4312 Datasheet, PDF (1/20 Pages) Power Integrations, Inc. – LYTSwitch High Power LED Driver IC Family

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
• <250 ms at full brightness
• <1s at 10% brightness
• High power factor >0.9
• Easily meets EN61000-3-2
• Less than 10% THD in optimized designs
• Up to 92% 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
and harmonics. Output current is tightly regulated with better
than ±5% CC tolerance¹. Efficiency of up to 92% is easily
achieved in typical applications.
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.
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.
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.
eSIP-7C (E Package)
Figure 2. Package Options.
eSIP-7F (L Package)
CONTROL
Figure 1. Typical Schematic.
Optimized for Different Applications and Power Levels
Part Number
LYT4211-LYT4218
LYT4311-LYT4318
Input Voltage Range
85-132 VAC
85-132 VAC
TRIAC Dimmable
No
Yes
Output Power Table^1,2
Product ⁶ Minimum Output Power ³ Maximum Output Power ⁴
LYT4x11E/L⁵
2.5 W
12 W
LYT4x12E/L
2.5 W
15 W
LYT4x13E/L
3.8 W
18 W
LYT4x14E/L
4.5 W
22 W
LYT4x15E/L
5.5 W
25 W
LYT4x16E/L
6.8 W
35 W
LYT4x17E/L
8.0 W
50 W
LYT4x18E/L
18 W
78 W
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 >80%.
3. Minimum output power requires C_BP = 47 µF.
4. Maximum output power requires C_BP = 4.7 µF.
5. LYT4311 C_BP = 47 µF, LYT4211 C_BP = 4.7 µF.
6. Package: eSIP-7C, eSIP-7F (see Figure 2).
www.powerint.com
February 2013