IW1690

Not Recommended For New Designs iW1690 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 compensation Very tight 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 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 kHz, 65 kHz or 75 kHz Dynamic base current control PFM operation at light load Built-in current sense resistor short protection 2.0 Description The iW1690 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 component count, simplifying EMI design and lowering the total bill of material cost. The iW1690 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. It also eliminates the need for loop compensation components whil...