iW1770

iW1770 Off-Line Digital Quasi-Resonant PWM Controller with Peak Power Operation 1 Description The iW1770 is a high performance AC/DC power supply controller that uses digital control technology to build peak current mode PWM flyback power supplies. The device operates in quasi-resonant mode to provide high efficiency and includes a number of key built-in protection features while minimizing the external component count, simplifying EMI design and lowering the total bill of material cost. The iW1770 can operate at peak power mode with momentary peak power higher than the maximum continuous output power without design cost and size increase. The iW1770 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. Pulse-by-pulse waveform analysis allows for a fast dynamic load transient reponse. The built-in power limit function en...