Renesas' digital Zero Voltage Switching (ZVS) 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.

The 65W adapter using Renesas' complete ZVS controller solution achieves 94% efficiency in a 50% smaller case.


Featured Products

Product Description
iW709 Secondary-Side USB Power Delivery 3.0 Interface IC Integrated with Synchronous Rectifier Controller and VBUS FET Driver
iW9801 100W Digital Zero Voltage Switching RapidCharge™ AC/DC Controller
iW9802 100W Digital Zero Voltage Switching RapidCharge™ AC/DC Controller

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 Renesas' 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:
    • Overvoltage (OVP)
    • Overcurrent (OCP)
    • User-configurable over-temperature
    • Shoot-through
    • Brown-in/Brown-out
    • VSENSE/ISENSE short
    • Output short
    • Extra primary side OCP and 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

Complete ZVS 2-Chip Solution for USB PD Chargers
ZVS Solution Works with Industry Standard Programmable References


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

  1. USB-IF PD Certified (USB PD 3.0 + PPS): iW709 and 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
100W+ Chargers in Half the Size Using Zero Voltage Switching (ZVS)