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100W Digital Zero Voltage Switching RapidCharge™ AC/DC Controller


High Frequency Operation Reduces Power Supply Size

The iW9802 digital AC/DC controller integrates Dialog’s patented adaptive Zero Voltage Switching (ZVS) technology to enable ultra-small, light-weight, low-cost and easily portable power supplies for any AC-powered product.  The device operates at high switching frequencies, which allows for a much smaller transformer and passive components, and it can work with a wide variety of third-party controllers, including the industry standard programmable reference (TL431) to implement fixed-voltage or adjustable output power supplies for RapidCharge applications.

The iW9802 provides high efficiency, high voltage and current control accuracy. The device offers advanced protection features for current and voltage protection and includes primary-side control over-voltage and over-current protection circuits in the event that secondary-side protections fail, making power supplies using the iW9802 extremely robust.

Learn more about Dialog's patented adaptive ZVS technology.

Lifecycle status

● Active


High switching frequency

  • Lighter, smaller transformer
  • Smaller passive components for easier EMI control

Patented adaptive ZVS control for high efficiency and low EMI

  • Efficiently recycles energy to minimize heat generation
  • Up to 94% efficiency

User-configurable ZVS timing optimizes performance for different power MOSFETs

Adaptive, seamless multi-mode control (MMC) improves efficiency and eliminates audible noise

AC unplug detection and X-cap discharge

Rich protection for:

  • Over-voltage (OVP)
  • Over-current (OCP)
  • User-configurable over-temperature
  • Shoot-through
  • Brown-in/brown-out
  • Output short
  • Extra primary-side OCP & OVP if optocoupler fails

Hardwired state-machine solution prevents hacking of fast chargers. Learn more


100W+ USB PD power supplies with third party PD controllers

D+, D- proprietary protocol RapidCharge protocol chargers

Power tools

Industrial power supplies

Network communication equipment

Laptop power supplies

Block Diagrams


Typical applications diagram


Functional block diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

Sample Request Form

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Product Briefs and Summaries
Name Date Version
iW9802 Product Summary (636.37 KB) 20/09/2021 0.4
Name Date Version
iW9802 Datasheet (1.15 MB) (Registered users only) 20/09/2021 0.3
Reference designs
Name Date Version
Reference Design EBC10247: iW9802-07 for 65W 20V/3.25A ZVS Design (4.91 MB) (Registered users only) 22/06/2021 1.0