Features
- Single-Stage DC/DC Buck
- Supports Wide DC Input Voltage with Tight Output Current Regulation (±3%)
- Output Power up to 90W
- PrimAccurate™ Primary-Side Control for Excellent Output Current Regulation with No Direct Voltage and Current Feedback Components Needed
- Independent Maximum Load Current Setting Interface
- PWM Dimming
- Supports 0-10V Dimming with iW339 Dimming Interface
- Wide Dimming Range: 1% - 100%, with 1% Resolution
- Configurable Minimum Dimming Setting
- Dim-to-Off, 1%, 5% or 10%
- Fully Protected
- Output Overvoltage, Output Open, Output Short, Overcurrent, Peak Current Limit, Sense-Resistor Short Protections
- Input Voltage Undervoltage Protection
- Built-In Over-Temperature Protection or External NTC
- Brown-In and Brown-Out Protection
- Small SOIC 8-Lead Package
iW3638 Functional Block Diagram
Description
The iW3638 second-stage buck LED driver provides constant current to LEDs directly from DC power supplies. It supports a non-isolated buck converter topology to post-regulate from an off-line AC/DC converter, minimizing low frequency output ripple current and eliminating virtually all flicker in the system, even down to 1%.
A wide range of DC input voltages simplifies design by enabling the use of just one second-stage driver across any commercial lighting product portfolio.
Parameters
| Attributes | Value |
|---|---|
| Function | Dimmable |
| Output Power Max (W) | 90 |
| Switching Frequency (KHz) | 200 - 200 |
| Optimal VIN (V) | 100 - 400 |
| Stages | Single-Stage |
| Dim Range (Min) (%) | 1 |
| Dim Range (Max) (%) | 100 |
| Controller / Integrated | Controller |
| Key Features | PrimAccurate, Single-Stage Buck, Supports Wide DC Input Voltage, Analog DIM2 interface, PrimAccurate, Single-Stage Buck, Supports Wide DC Input Voltage, Analog DIM2 interface (internal OTP disabled), PrimAccurate, Single-Stage Buck, Supports Wide DC Input Voltage, NTC DIM2 interface, PrimAccurate, Single-Stage Buck, Supports Wide DC Input Voltage, PWM DIM2 interface |
| Protection Features | OVP, OCP, UVLO, External OTP, OVP, OCP, UVLO, OTP |
| Dimmer Functions Supported | Analog Dimming, PWM Dimming, 0-10V, PWM Dimming, 0-10V |
| Pass Device | FET |
| Power Factor Correction | NA |
| LED Current Accuracy (%) | 3 |
| Output Power (Min) (W) | 3 |
Package Options
| Pkg. Type | Lead Count (#) | Pitch (mm) |
|---|---|---|
| SOIC-8 | 8 | 1.27 |
Applications
- Commercial Lighting
- T8
- 0-10V Dimming
- External Fixture Drivers
- Wireless and Intelligent LED Lighting Systems
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