RENESAS IW1790-19B

The iW1790 is a high performance AC/DC power supply controller for rapid charge that uses main transformer communication (XM-Comm) technology to minimize external component count and simplify system design. The device operates in quasi-resonant mode to provide high efficiency and it also provides a number of key built-in protection features. The iW1790 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 iW1790 is optimized to work with Dialog’s iW660/2/3 secondary-side controllers for various rapid charge protocols, such as Samsung Adaptive Fast Charge (AFC) (iW660), Qualcomm Quick Charge 2.0 and 3.0 (QC2.0 – iW660/2/3 and QC3.0 – iW662) technologies, Huawei Fast Charger Protocol (FCP) (iW663), etc... to achieve fast and smooth voltage transitions upon request by mobile devices (MD). When paired with the iW660/2/3, the iW1790 completely eliminates the optocoupler between primary and secondary side. Using Dialog’s proprietary transformer communication technology, XM-Comm, the iW660/2/3 can communicate with the iW1790 to send output voltage requests, output current limits, output voltage undershoot and over voltage information without any additional external components. The iW1790 paired with the iW660/2/3 can provide fast dynamic load response in typical AC/DC rapid charge adapter designs. In addition, the iW1790 uses source charging technology to charge up VCC before startup, which eliminates the external active start-up (ASU) circuit and still can achieve <20 mW no-load power consumption at 5V/2A output setting. Dialog’s innovative proprietary technology ensures that power supplies designed with the iW660/2/3 and iW1790 can provide various output voltage configurations for AFC/QC2.0/QC3.0/FCP and other proprietary protocols, with various user-selected output current limit combinations.

• Integrated XM-Comm technology eliminates secondary-to-primary optocoupler
• Transformer communication for all the rapid charge information: output voltage request, output current limit, output voltage undershoot, and over-voltage protection
• Source charging VCC technology eliminates the active start-up (ASU) and maintain ultra-low no-load power consumption (<20 mW) at 230 VAC with typical 5V/2A output setting
• High VCC pin voltage rating eliminates external VCC LDO
• Tight multi-level constant-voltage and multi-level constant-current regulation with primary-side feedback and control
• Fast dynamic load response (DLR)
• Proprietary optimized load adaptive maximum constant frequency PWM switching with quasi-resonant 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+TM control technology addresses issues of soft shorts in cables and connectors by effectively reducing the average output power at fault conditions without latch
• Dual over-temperature protection with both internal OTP and external shutdown control
• No audible noise over entire operating range
• Supports rapid charge technologies, such as AFC, QC 2.0 and 3.0 technologies, FCP, etc.

• Rapid-charging AC/DC adapters for smart phones, tablets and other portable devices (3.6V-12V, 1A-3A).