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iW1820
15W AccuSwitch™ AC/DC Digital Primary-Side Switcher Eliminates Optocoupler and Maintains Excellent Cross-Regulation Accuracy
72kHz integrated 800V BJT optimized for 5Vout
The iW1820 AccuSwitch™ digital PWM controller integrates a highly accurate control circuit with an 800V BJT power switch to provide a complete solution for off-line power conversion at up to 15W of output power.
Dialog’s 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 white goods applications.
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 <30mW of no-load power consumption to meet global energy efficiency regulations.
Features
15W Output, Optimized for 5Vout
AccuSwitch™ integrated 800V Power BJT
PrimAccurate™ Primary-Side Control
No Optocoupler Needed
Intelligent Digital Control Loop for Accurate Voltage Cross-Regulation
Meets Global Energy Efficiency Standards
- <30mW 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 Over-Voltage and Over-Current Protection
- Sense-Resistor Short Circuit Protection
Thermally Efficient SO-10 Batwing Package
Applications
Power Adapters/Chargers for Media Tablets, Smartphones, Consumer Electronics
AC/DC Power Supplies for Home Appliances, Industrial Electronics
Block Diagrams
Typical application diagram
Functional block diagram
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