Features
- Digital PFC boost and flyback combo IC
- Output power to 150W
- True DC dimming
- 0.0625% to 100% flicker-free dimming range
- High-resolution 0.0625% steps
- High Power Factor (PF) > 0.95 and low THD (< 20%) at 277Vac/50Hz, 50% load
- Boost PFC stage enables use of small bulk input capacitance with low voltage rating
- Meets IEC61000-3-2 harmonic currents standard
- Dual dimming ports
- One for absolute maximum output power
- One for 3-in-1 dimming input – 0-10V analog, 0-10V PWM, or resistive
- UART communication RX/TX pins – enables communication with MCU for smart lighting systems
- Power meter functions – measures input voltage and input current with basic math calculations
- SOIC-14 package
Description
The iW3700 integrates a high power factor (PF) boost controller and a flyback controller into one combo IC for optimal performance in industrial and commercial lighting systems, while optimizing system size and total BOM cost. The IC uses Renesas’ proprietary digital control in both the PFC boost stage and the isolated flyback stage, enabling high-performance conversion with fast dynamic load response while providing low THD (< 20%) and high PF (> 0.95) over a broad load range. The digital technology also enables true DC dimming, which provides smooth dimming without flicker from 0.0625% to 100% of the brightness range in 0.0625% steps.
System-level features include a unique UART interface for smart applications, allowing the IC to interface directly with an MCU in smart lighting applications such as DALI2 systems. The iW3700 also provides a power meter function that can be communicated over the UART interface back to the system MCU.
The dimming function provides two inputs, one for setting the absolute maximum output power and the second as the input for a 3-in-1 dimming interface. The input can take a 0-10 analog input, 0-10V PWM input, or a resistive input to set the dimming percentage relative to the main dimming input that sets the maximum output power.
For non-isolated applications up to 250W, see the iW3701.
Parameters
| Attributes | Value |
|---|---|
| Function | Dimmable |
| Output Power Max (W) | 150 |
| Switching Frequency (KHz) | 200 - 200 |
| Optimal VIN (V) | 85 - 305 |
| Stages | Two-Stage |
| Dim Range (Min) (%) | 0.0625 |
| Dim Range (Max) (%) | 100 |
| Controller / Integrated | Controller |
| Key Features | PFC Boost + Dimmable Flyback, 0.0625% Dimming Resolution, DALI-2 Compliant |
| Protection Features | OVP, IOVP, SRSC, PCL/OCP, OTP, PFC-OLP |
| Peak Efficiency (%) | 92 |
| Dimmer Functions Supported | Analog Dimming, PWM Dimming, 0-10V |
| Pass Device | FET |
| Power Factor Correction | >0.95 |
| LED Current Accuracy (%) | 3 |
| Output Power (Min) (W) | 5 |
Package Options
| Pkg. Type | Lead Count (#) |
|---|---|
| SOIC-14 | 14 |
Applications
- Industrial lighting
- 0-10V dimming LED drivers to 150W
- Smart lighting systems – DALI/DALI2, wireless SSL lighting systems