IW1688

www.DataSheet4U.com iW1688 Low-Power Off-line Digital PWM Controller 1.0 Features Primary-side feedback eliminates opto-isolators and simplifies design Multi-mode operation for highest overall efficiency ±4% typical output voltage regulation No external compensation components required Complies with CEC/EPA no load power consumption and average efficiency regulations Built-in output constant-current control with foldback Low start-up current (8 µA typical) Built-in soft start Built-in short circuit protection AC line under/overvoltage and output overvoltage protection Fixed 40 kHz switching frequency 2.0 Description The iW1688 is a high performance power supply controller which uses digital control technology to build sensorless peak current mode PWM flyback power supplies. The device provides high efficiency along with a number of key built-in protection features while minimizing the external component count and bill of material cost. The iW1688 removes the need for secondary feedback circuitry 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 loop response that is typically much faster than traditional solutions, resulting in significantly better dynamic load response. The built-in power limit function enables optimized transformer design in universal off-line applications and allows for a w...