Description
The iW1782 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 iW1782 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.The iW1782 is optimized to work with Dialog’s iW636 secondary-side controller for Qualcomm® Quick Charge™ 3.0 (QC3.0) technology, to achieve fast and smooth voltage transition upon request by mobile devices (MD). When paired with the iW636, the iW1782 eliminates the discrete decoders on the primary side, minimizes the external component count and simplifies system designs. The iW636 can communicate with the iW1782 through one opto-coupler for all the necessary rapid charge information including output voltage requests, output current limits, output voltage undershoot and output over-voltage.Dialog’s innovative proprietary technology ensures that power supplies designed with the iW636 and iW1782 can provide 5V/9V/12V output voltage configuration for QC2.0 and other proprietary protocols and 3.6V to 12V in 200mV increments for QC3.0, with user-selected various output current limit combinations. Furthermore, the chipset can achieve <10mW no-load power consumption at 5V2A output setting and fast dynamic load response in typical AC/DC rapid charge adapter designs.
- Supports rapid charge technologies such as Qualcomm® Quick Charge™ 3.0 (QC3.0) technology to provide 3.6V to 12V in 200mV increments with userselected various output current limit combinations
- Proprietary secondary-to-primary digital communication and built-in decoder eliminate discrete decoder and significantly simplify system design
- Single opto-coupler 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
- Proprietary optimized 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 4-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
