iW1818

iW1818 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller Integrated with Power BJT 1 Description The iW1818 is a high performance AC/DC power supply control device that uses digital control technology to build peak current mode PWM flyback power supplies. The device includes an internal power BJT, operates in quasi-resonant mode, and includes key built-in protection features. This combination of features and integration simplifies design, improves efficiency, reduces EMI and lowers the bill of material cost. The iW1818 features a distinctive soft-start scheme, which allows for fast and yet smooth start-up with both small and large capacitive loads. It removes the need for a secondary feedback circuit while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions. The pulse-by-pulse waveform analysis allows for fast dynamic load response. The built-in power limit function ...