Dialog Semiconductor plc has announced two power control integrated circuits. The iW1818 and iW1830 AccuSwitch™ pulse width modulation (PWM) controllers use Dialog's PrimAccurate™ primary-side control to eliminate the need for optocouplers, the weakest link in achieving the high reliability and long operating lifetime for appliances. The elimination of a secondary-side regulator and optocoupler means reduced BOM costs and fewer solder joints for potential failure, inherently increasing reliability. Dialog's patented intelligent digital control loop technology provides accurate voltage cross-regulation between the multiple power rails in the system. The iW1818 and iW1830 simplify appliance power supply designs by integrating a high-voltage power switch (800V BJT and 700V MOSFET, respectively) and both support high capacitance loads (up to 6,000µF) at up to 12V.
The adaptive multi-mode PWM/PFM control in the iW1818 and iW1830 dynamically changes the switching frequency to optimise the system for high efficiency even at light loads. They provide >80% active average efficiency, maintain high efficiency at loads as light as 10% and achieve <50mW no-load standby power with fast standby recovery time. This helps white goods designers meet global energy efficiency regulations, including the European Ecodesign Directive and the U.S. Department of Energy (DoE) energy conservation standards.
Both parts come in a thermally efficient, small footprint, easy-to-use PDIP-7 package that ensures excellent thermal performance using a single-layer PC board. In addition to built-in over-temperature protection, they offer full protection from fault conditions, such as output short-circuit, over-voltage and over-current.
Key Features
- Output power: 10W (iW1818), 15W (iW1830)
- PrimAccurate™ primary-side control eliminates optocoupler for higher reliability and lower BOM cost
- Intelligent digital control for accurate voltage cross-regulation
- High voltage internal power switch
- iW1818: 800V BJT
- iW1830: 700V MOSFET
- Support high capacitance loads up to 6,000µF
- Optimized for 12V output
- < 50mW no load standby power
- Robust protection features:
- Output short circuit, over voltage, over current
- Built-in over-temperature protection