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IW1791 Datasheet(PDF) 1 Page - Dialog Semiconductor |
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IW1791 Datasheet(HTML) 1 Page - Dialog Semiconductor |
1 / 6 page iW1791 AC/DC Primary-Side Rapid ChargeTM PWM Controller with High Resolution Voltage/Current Control Rev. 1.2 Product Summary © 2018 Dialog Semiconductor www.dialog-semiconductor.com 1 of 6 11-Jan-2018 Qualcomm® Quick ChargeTM 2.0 and 3.0 are products of Qualcomm Technologies, Inc. 1 Description The iW1791 is a high performance AC/DC power supply controller for rapid charge applications that supports high resolution voltage/current control. It uses Dialog’s PrimAccurateTM 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 iW1791 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 iW1791 is optimized to work with Dialog’s secondary-side controllers that use the proprietary digital link (DLNK) technology. The iW1791 and DLNK-based secondary-side controller chipset together can implement various rapid charge protocols, such as USB Power Delivery (USB PD), Qualcomm® Quick Charge™ 2.0 and 3.0 (QC2.0 and QC3.0) technologies, etc. to achieve fast and smooth voltage transitions upon request by mobile devices (MD). The iW1791 and compatible secondary-side controller from Dialog use the DLNK communction protocol for output voltage requests, output current limits, output voltage undershoot and over voltage information from the secondary to the primary. In addition, the iW1791 uses source charging technology to charge up VCC before startup, which eliminates the external active start-up (ASU) circuit and still can achieve < 20mW no-load power consumption at typical 5V output setting. Dialog’s innovative proprietary technology ensures that power supplies designed with the iW1791 and Dialog’s secondary-side controllers can provide output voltage configurations of 3V to 20V for USB PD, 5V/9V/12V for QC2.0 and 3.6V to 12V in 200mV increments for QC3.0 and other proprietary protocols. 2 Features ● Supports 10mV DLNK voltage step request required by USB PD programmable power supply (PPS) and other proprietary rapid charge protocols ● Source charging VCC technology eliminates the active start-up (ASU) and maintain ultra-low no-load power consumption (< 20mW) at 230VAC with typical 5V 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 ● Proprietary optimized load adaptive maximum constant frequency PWM switching with quasi-resonant operation achieves best size, efficiency, and common mode noise ● Backward compatible with QC2.0/3.0 and other proprietary rapid charge protocols with secondary-side interface circuits ● Multi-mode PWM/PFM control improves efficiency at various load conditions ● No audible noise over entire operating range ● User-configurable 4-level cable drop compensation independent of output voltage ● Proprietary secondary-to-primary digital communication with single optocoupler for all the rapid charge information: x Output voltage request x Output current limit x Output voltage undershoot detection for fast dynamic load response x Over-voltage protection ● 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 3 Applications ● Rapid-charging AC/DC adapters for smart phones, tablets and other portable devices. |
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