Overview
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.
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
Comparison
Applications
- Three-Phase Smart Electricity Meters
- Industrial Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 1.38 MB | |
| Product Brief | PDF 515 KB | |
| Other | ZIP 2.32 MB | |
| Other | ZIP 2.94 MB | |
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Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| SO-10 Batwing | Tape & Reel | 1 | Get Samples, | |
| SO-10 Batwing | Tape & Reel | 1 | Get Samples, | |
| SO-10 Batwing | 1 | Get Samples, |
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