LNK417LG
LinkSwitch-PH single-stage PFC LED driver with high power factor for lighting up to 17W
Product Overview
Description
The LNK417LG is a member of the LinkSwitch-PH family, designed for LED lighting applications requiring high power factor and accurate constant current control.
This IC integrates PFC and CC control in a single stage, reducing component count while achieving PF > 0.9 and THD < 20%.
The device supports various dimming options including 0-10V analog and PWM, making it ideal for commercial and industrial lighting applications.
Product Series
LNK
Primary Application
Commercial LED lighting
Key Features
- Single-stage PFC and CC control
- High power factor >0.95
- Low THD <15%
- 0-10V and PWM dimming
- Accurate constant current
- Integrated protection
Specifications
| Output Power | Up to 17W |
|---|---|
| Input Voltage | 90-265V AC |
| Output Current | Up to 350mA |
| Power Factor | >0.95 |
| THD | <15% |
| Dimming | 0-10V, PWM |
| Package | eSOP-16B |
Applications
Commercial LED lighting
Electronic system design
Industrial lighting
Industrial automation and control
Street lighting
Electronic system design
High-bay lighting
Electronic system design
FAE Expert Insights
"LinkSwitch-PH is an excellent choice for commercial LED lighting requiring high power factor and dimming capability. The LNK417LG achieves PF > 0.95 with single-stage design, significantly reducing component count compared to two-stage solutions. What I particularly appreciate is the flexibility in dimming options - both 0-10V analog and PWM are supported, making it compatible with various control systems. The device easily meets IEC 61000-3-2 Class C requirements for commercial lighting. For designs requiring the highest PF and dimming flexibility, I recommend the eSOP-16B package for good thermal performance."
Single-stage high-PF design with flexible dimming options
— James Zhang, BeiLuo
Frequently Asked Questions
How does single-stage PFC work in LinkSwitch-PH?
LinkSwitch-PH uses a proprietary single-stage topology that combines PFC and constant current control: 1) The device operates in critical conduction mode (CRM) for natural power factor correction, 2) The control algorithm shapes the input current to follow the input voltage waveform, 3) Output current is regulated through primary-side sensing, 4) Single-stage design eliminates the need for separate PFC boost stage, 5) Achieves PF > 0.95 and THD < 15% with minimal components. This approach significantly reduces BOM cost and size compared to traditional two-stage designs while meeting international standards.
Choose LinkSwitch-PH for cost-effective high-PF designs where component count and size are critical.
What dimming interfaces are supported by LinkSwitch-PH?
LinkSwitch-PH supports multiple dimming interfaces: 1) 0-10V Analog Dimming - industry standard for commercial lighting control systems, 2) PWM Dimming - compatible with digital control systems and smart lighting, 3) Resistive Dimming - simple potentiometer control, 4) Combined Dimming - 0-10V with PWM override. The dimming range is typically 1-100% with smooth, flicker-free operation. The device automatically detects the dimming mode and adjusts accordingly. For commercial applications, 0-10V is most common, while PWM is preferred for smart lighting systems.
Select dimming interface based on your control system - 0-10V for traditional commercial, PWM for smart lighting.
How do I meet IEC 61000-3-2 with LinkSwitch-PH?
LinkSwitch-PH is designed to meet IEC 61000-3-2 Class C requirements for lighting equipment: 1) The device achieves PF > 0.95 with typical designs, 2) THD is typically <15% at full load, 3) Individual harmonic limits are met without additional filtering, 4) Design guidelines in the datasheet ensure compliance across line and load variations, 5) PI Expert software provides optimized designs meeting the standard. For guaranteed compliance, follow the reference designs and use recommended component values. The device has been tested and certified to meet Class C limits for lighting applications.
Follow datasheet reference designs and use PI Expert software for IEC 61000-3-2 compliant designs.
What is the difference between LinkSwitch-PH and LYTSwitch?
LinkSwitch-PH and LYTSwitch target different LED lighting applications: LinkSwitch-PH is designed for commercial and industrial lighting requiring high power factor (>0.9) and dimming control (0-10V/PWM). It uses single-stage PFC topology and achieves low THD. LYTSwitch is optimized for consumer lighting with excellent phase-cut dimming compatibility with standard wall dimmers. It focuses on dimming quality rather than high PF. Choose LinkSwitch-PH for commercial applications with control systems, and LYTSwitch for residential retrofit lamps with wall dimmers.
Use LinkSwitch-PH for commercial lighting with high PF requirements, LYTSwitch for residential dimmable lighting.
How do I optimize thermal design for LinkSwitch-PH?
Thermal design for LinkSwitch-PH involves: 1) Package selection - eSOP-16B provides exposed pad for better heat dissipation, 2) PCB copper area - use maximum copper area connected to exposed pad as heatsink, 3) Thermal vias - place multiple vias under exposed pad to spread heat, 4) Component placement - keep heat-sensitive components away from the IC, 5) Ambient considerations - ensure adequate airflow in enclosed fixtures. The device has thermal shutdown at 150°C with hysteresis. For high ambient temperature applications (>50°C), increase copper area or use external heatsinking.
Use eSOP-16B package with maximum copper area for best thermal performance. Contact FAE for high-temperature designs.