IW1791-12

Power Supply Controllers, Monitors Overview

The IW1791-12 is a primary-side regulation (PSR) AC/DC digital controller designed for Rapid Charge applications. It supports flyback topology with peak current mode DCM control. Key electrical parameters include a maximum output power of 27W, a switching frequency range of 76 kHz to 80 kHz, and a VBIAS maximum rating of 40V. The device features UVLO thresholds of 15.5V rising and 7.2V falling. It is housed in an SOIC-8 package.

Power Supply Controllers, Monitors Feature Summary

• Primary-side regulation eliminates the need for optocouplers and secondary feedback components.
• Digital control architecture enables high-resolution voltage and current regulation.
• Integrated FET driver provides up to 1A output current capability.

Power Supply Controllers, Monitors Applications

• USB PD 3.0 AC/DC power adapters for smartphones, tablets, and laptops
• Power supplies for set-top boxes, displays, and speakers
• In-the-wall receptacles with USB PD 3.0 ports
• Lamps and lighting fixtures with USB PD 3.0 ports

Power Supply Controllers, Monitors Procurement Notes

Verify availability status directly with Renesas Electronics or authorized distributors, as supply may be limited or subject to factory special orders. Confirm that the specific suffix '-12' matches your required packaging configuration. Ensure compatibility with your target charging protocols, such as USB PD 3.0 or Qualcomm Quick Charge 4+, before finalizing procurement.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring compact AC/DC converters up to 27W. It is suitable for applications prioritizing BOM cost reduction through primary-side regulation. Ensure the design supports DCM operation within the specified 76-80 kHz frequency range. Verify that the input voltage range aligns with the UVLO thresholds for reliable startup and shutdown behavior.

Power Supply Controllers, Monitors Part Context

This part belongs to Renesas' portfolio of power management solutions, specifically targeting efficient AC/DC conversion. It complements other digital controllers and GaN-based systems by offering a cost-effective solution for consumer electronics and mobile device charging accessories without sacrificing regulation precision.

Power Supply Controllers, Monitors Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Consult Renesas technical support for cross-reference recommendations if this specific model is unavailable.

Power Supply Controllers, Monitors FAQ

What control mode does the IW1791-12 utilize?

It utilizes Primary-Side Regulation Peak Current Mode DCM (Discontinuous Conduction Mode).

Is the IW1791-12 suitable for isolated topologies?

Yes, it is designed for Flyback topology which provides galvanic isolation via a transformer, using primary-side sensing instead of secondary feedback.