LYT4218E
Single-Stage Accurate Primary-Side Constant Current (CC) Controller
Product Details
Product Highlights
- Better than ±5% Constant Current (CC) Regulation
- Power Factor Correction (PFC) for Low-Line Applications
- TRIAC Dimming and Non-Dimming Options
Description
High Performance, Combined Driver, Controller, Switch
The LYTSwitch-4 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-4 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-4 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-4 family do not use primary-side aluminum electrolytic bulk capacitors. This means greatly extended driver lifetime, especially in bulb and other high temperature applications.
Other Features
- 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
Specifications
| Power - Output (Min, Low-Line) | 18.00 W |
| Power - Output (Max Low-Line) | 78.00 W |
| Switching Frequency (max) | 132 kHz |
| Breakdown Voltage | 725 V |
| Voltage - Input (Min) | 85 V |
| Voltage - Input (Max) | 132 V |
| Auto-Restart & Overvoltage Response | Latch Off |
| IC Package | eSIP-7C |
| Mounting Type | Surface Mount |
| Over-Temperature Response | Hysteretic |
| Power Factor | High |
| Temperature - Operating (Min) | -40 °C |
| Temperature - Operating (Max) | 150 °C |
| Control Scheme | Primary-side |
| Control Features |
Frequency Jittering
Soft Start
Auto-Restart/Latching Fault Response
On/Off Control
|
| Protection Features |
Input Overvoltage
Output Open Loop
Output Overload
Output Overvoltage
Output Short Circuit
Overtemperature
|
| Output Profile | CC |
| Topology |
Buck-Boost
Flyback
Tapped Buck
|
| Product Sub-Type | PMIC |
