Features
- 12W Output
- AccuSwitch™ Integrated 1200V Power BJT
- PrimAccurate™ Primary-Side Control
- No Optocoupler Needed
- Intelligent Digital Control Loop for Accurate Voltage Cross-Regulation
- Meets Global Energy Efficiency Standards
- <50mW No-Load Power Consumption
- Quasi-resonant Control for Optimal Efficiency
- Adaptively Controlled Soft Start-up
- Fast, Smooth Start-up into Large Capacitive Loads (up to 6,000µF)
- EZ-EMI™ Design
- Reduces Filtering Requirements
- Easily Meets Global EMI Specifications
- Fully Protected from Fault Conditions
- Built-In Over-Temperature Protection
- Output Overvoltage and Overcurrent Protection
- Sense-Resistor Short Circuit Protection
- Thermally Efficient SO-10 Batwing Package
Description
The iW1821 AccuSwitch™ digital PWM controller integrates a highly accurate control circuit with a 1200V bipolar junction transistor (BJT) power switch to provide a complete solution for off-line power conversion at up to 12W of output power.
Renesas' PrimAccurate™ primary-side digital control algorithms eliminate the need for failure-prone optocouplers and ensure excellent cross-regulation accuracy, to enable the longer operating lifetime, high performance and reduced cost required for industrial applications and appliances.
The output is designed to smoothly start-up into large capacitors while maintaining a quick turn-on time. It operates in quasi-resonant mode to optimize efficiency and incorporates a low-power mode that achieves <50mW of no-load power consumption to meet global energy efficiency regulations.
Parameters
| Attributes | Value |
|---|---|
| Topology Characteristic | Flyback |
| Control Mode | Primary-Side Regulation Peak Current Mode DCM |
| UVLO Rising (V) | 14.5 |
| UVLO Falling (V) | 4.4 |
| VBIAS (Max) (V) | 20 |
| PWMs (#) | 1 |
| Output Power Max (W) | 12 |
| Switching Frequency (KHz) | 72 - 72 |
| No Load Power (mW) | 50 |
| Controller / Integrated | Integrated |
| Advanced Features | AccuSwitch, EZ-EMI, PrimAccurate |
| Temp. Range (°C) | -40 to +125°C |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Lead Count (#) | Pitch (mm) |
|---|---|---|
| SO-10 Batwing | 10 | 1.27 |
| SO-10 Batwing | 10 | — |
Application Block Diagrams
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Additional Applications
- Three-Phase Smart Electricity Meters
- Industrial Applications