Описание
The iW1780 is a high performance AC/DC power supply controller for rapid charge 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 a number of key built-in protection features. The iW1780 can achieve tight multi-level constant voltage and multi-level constant current regulation without a traditional secondary-feedback circuit. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions.
? Supports rapid charge technologies such as Qualcomm® Quick Charge™ 2.0 (QC2.0) technology to provide 5V/9V/12V with user-selected various output current limit combinations ? Proprietary secondary-to-primary digital communication and built-in decoder eliminate discrete decoder and significantly simplify system design ? Single optocoupler for all the rapid charge information: output voltage request, output current limit, output voltage undershoot, and over-voltage protection ? Tight multi-level constant-voltage and multi-level constant-current regulation with primary-side feedback and control ? Ultra-low no-load power consumption with lowest system cost (< 10mW at 230VAC with typical 5V2A setting using Schottky diode rectifier; < 20mW at 230VAC with typical 5V2A setting using synchronous rectifier) ? Fast dynamic load response (DLR) with secondaryside load transient detection 3 Applications ? Rapid-charging AC/DC adapters for smart phones, tablets and other portable devices (5V-12V, 1A-3A). ? Proprietary optimized line/load adaptive maximum constant frequency PWM switching with quasiresonant operation achieves best size, efficiency, and common mode noise ? Multi-mode PWM/PFM control improves efficiency at various load conditions ? User-configurable 5-level cable drop compensation independent of output voltage ? EZ-EMI® design enhances manufacturability ? Built-in single-point fault protections against output short-circuit including soft short and half short, output over-voltage, and output over-current ? SmartDefender™ smart hiccup technology helps address issues of soft shorts in cables and connectors by effectively reducing the average output power at fault conditions without latch ? User-configurable external shutdown control ? No audible noise over entire operating range
