The iW1825 is an AccuSwitchTM product that integrates a 700V power MOSFET with a high-performance digital

AC/DC controller. The product offers a unique light load mode that can be configured with an external resistor to

allow the design to be optimized for ultra-low no-load power consumption or fast transient response. It operates in

quasi-resonant mode to provide high efficiency at heavy loads and minimizes the external component count while

simplifying EMI design and lowering the total bill of material cost.

Dialog’s PrimAccurateTM primary-side sensing technology allows the iW1825 to eliminate the need for secondary-side

feedback while achieving excellent line and load regulation. This proprietary digital control technology also eliminates

the need for loop compensation components while maintaining stability over all operations. Pulse-by-pulse waveform

analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load

response. The built-in power limit function enables optimized transformer design in universal off-line applications and

allows for a wide input voltage range.

Dialog’s innovative proprietary technology ensures that power supplies built with the iW1825 can achieve both the

highest average active efficiency and less than 75mW no-load power consumption. Active start-up circuitry enables

fast, yet smooth start-up into large capacitive loads at output voltages of 9V, 12V or higher, making it ideal for

networking and monitor adaptor applications.

The iW1825 offers a full range of fault protection circuits including internal and external over-voltage protection (OVP).

The external OVP feature can monitor either the input voltage or output voltage. The -01 and -31 options offer a

supplemental output OVP, while the -10 option can monitor the input voltage, even during start-up, to protect from an

over-voltage event on the input.