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100W+ Chargers in Half the Size Using Zero Voltage Switching (ZVS)

Dialog’s digital Zero Voltage Switching solutions can shrink 100W+ chargers up to 50% at low total BOM cost.

Our patented ZVS technology solves the thermal constraints associated with the AC/DC converter efficiency, while reducing component size to enable high power density in an ultra-compact, light-weight charger form factor.

ZVS Solution Features

High switching frequency (up to 200kHz) enables:

  • 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

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

Supports fine step CV/CC regulation when paired with Dialog’s iW709 secondary-side controller or with TL431

Drives GaN devices via OUTPUT pin directly or external GaN driver

Best for output power from 20W to 100W+

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

Intelligent, eco-friendly low standby power < 20mW

Supports USB Power Delivery 3.0 with PPS (iW709)

Integrated VBUS NFET driver (iW709)

Supports Direct Charge (iW709)

Hardwired state-machine solutions: prevent hacking of fast chargers

ZVS size comparison

65W adapter using Dialog’s complete ZVS controller solution achieves 94% efficiency in a 50% smaller case.

iw9801 block diagram

Complete ZVS 2-chip solution for USB PD chargers

iw980x block diagram

ZVS solution works with industry standard programmable references


All primary-side ICs (iW17xx & iW98xx) feature advanced cable fault protection

  1. USB-IF PD Certified (USB PD 3.0 + PPS): iW709 & iW657P
  2. VBUS Switch Driver: Integrated charge pump that drives an external N-channel MOSFET protects VBUS from output short-circuit damage and enables lower cost, easier sourcing vs P-channel
  3. ZVS: Zero Voltage Switching flyback technology
  4. SSR: Secondary-Side Regulation
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