Overview
* Primary-side feedback eliminates opto-isolators and simplifies design * 64-kHz PWM switching frequency * No-load power consumption < 100 mW at 230 Vac with tight dynamic load transient response * Able to meet < 30 mW no-load power consumption with large value pre-load resistor * Adaptive multi-mode PWM/PFM control improves efficiency * Quasi-resonant operation for highest overall efficiency * EZ-EMI ® design to easily meet global EMI standards * Direct drive of low-cost BJT switch * Dynamic base current control * Very tight constant voltage and constant current regulation with primary-side-only feedback The iW1678 is a high performance AC/DC power supply controller which uses digital control technology to build peak current mode PWM flyback power supplies. The iW1678’s 64-kHz PWM switching frequency allows the design of ultracompact AC/DC a.
