IW1702-31B

AC DC Converters, Offline Switchers Overview

The iW1702-31B is a digital offline quasi-resonant PWM controller optimized for AC/DC power supplies with output voltages of 9V or higher. It supports a maximum output power of 45W and utilizes PrimAccurate™ primary-side regulation to eliminate the need for optocouplers. The device features peak current mode control in discontinuous conduction mode (DCM) with a switching frequency range of 79 kHz. Key electrical parameters include an UVLO rising threshold of 13.7 V, falling threshold of 6.4 V, and a maximum bias voltage of 20 V. It operates within a temperature range of -40°C to +125°C and provides no-load power consumption below 75 mW.

AC DC Converters, Offline Switchers Feature Summary

• Integrates PrimAccurate™ primary-side regulation technology to achieve precise output voltage control without secondary-side optocouplers.
• Features SmartDefender™ intelligent hiccup mode to prevent soft shorts in cables and connectors during fault conditions.
• Includes configurable light load operation modes to optimize no-load power consumption while maintaining dynamic load response performance.

AC DC Converters, Offline Switchers Applications

• Digital control systems for fully automatic espresso machines
• AC/DC power adapters optimized for 9V+ output applications
• Offline flyback converters requiring primary-side regulation

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity through authorized Renesas distributors due to limited supply status. Confirm RoHS compliance details via official documentation before integration. Check specific package variants such as SOT23-6L availability. Ensure design compatibility with external components like the iW676 synchronous rectifier controller if high power density is required. Validate that the selected variant matches the intended input overvoltage protection configuration.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for designs prioritizing cost reduction through the elimination of optocouplers and transformer auxiliary windings. It is suitable for applications requiring strict adherence to DoE Level VI and EU CoC Phase 2 efficiency standards. Consider pairing with the iW676 digital synchronous rectifier controller to enhance dynamic load response while maintaining low no-load power consumption below 75 mW. Evaluate the trade-off between switching frequency and efficiency based on specific thermal constraints.

AC DC Converters, Offline Switchers Part Context

The iW1702 series belongs to Renesas' portfolio of digital power management integrated circuits designed for offline AC/DC conversion. This family leverages advanced digital control algorithms to replace traditional analog PWM controllers. The iW1702-31B specifically targets higher voltage outputs compared to other variants in the series, offering tailored protection and regulation features for modern power adapter requirements.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Renesas technical support for direct replacements or evaluate alternative models within the iW1702 family based on specific voltage and power requirements.