IW1690 Datasheet | iWatt

Not Remended For New Designs i W1690 Low-Power Off-line Digital PWM Controller 1.0 Features - Primary-side feedback eliminates opto-isolators and simplifies design - Direct drive of BJT switching device - Multi-mode operation for highest overall efficiency - Built-in cable drop pensation - Very tight output voltage regulation - No external pensation ponents required - plies with CEC/EPA no load power consumption and average efficiency regulations - Built-in output constant-current control with primary-side feedback - Low start-up current (10 µA typical) - Built-in soft start - Built-in short circuit protection and output overvoltage protection - Optional AC line under/overvoltage protection - Fixed switching frequency: 45 k Hz, 65 k Hz or 75 k Hz - Dynamic base current control - PFM operation at light load - Built-in current sense resistor short protection 2.0 Description The i W1690 is a high performance AC/DC power supply controller which uses digital control technology to build peak current mode PWM flyback power supplies. The device directly drives a BJT switching device and provides high efficiency along with a number of key built-in protection Features while minimizing the external ponent count, simplifying EMI design and lowering the total bill of material cost. The i W1690 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. It also eliminates the need for loop pensation ponents while maintaining stability over all operating conditions. 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. The ultra-low start-up power and operating current at light load ensure that the i W1690 is ideal for applications targeting the newest...