Power Integrations InnoSwitch5-Pro
InnoSwitch5-Pro achieves the most compact USB 3.0 Extended Power Range (EPR) designs
With the latest generation of its flagship InnoSwitch flyback switcher IC family, Power Integrations has achieved a new level of integration. The innovative InnoSwitch5-Pro digitally programmable switcher ICs provide a single-chip approach to achieving zero-voltage switching (ZVS), without the costly addition of a high-voltage switch.
The new devices combine a robust 750 V or 900 V PowiGaN primary switch with the controllability of an I²C interface and the loss reduction of ZVS, resulting in higher than 95% efficiency without heatsinks and reducing the component count and PCB area required for ultra-compact adapters up to 220 W. Applications include notebooks, home gateways, USB power strips, in-wall USB receptacles, high-end cellphones and other consumer products.
Reasons to buy
- 95% efficiency – no heatsinks, spreaders or potting materials for thermal management
- Simple I²C interface supports USB PD, PPS, UFCS and custom fast-charging protocols
- 750 V or 900 V PowiGaN primary switch for up to 220 W output power without heatsinks
- Far fewer components than asymmetric half-bridge or active clamp alternatives
- Operation from universal mains with or without a PFC stage
- The most compact designs for USB PD 3.0 Extended Power Range (EPR) adapters
- Post-production tolerance offset to facilitate accurate output constant-current control of better than 2%, supporting the UFCS protocol in China
Product Description
The InnoSwitch5-Pro family of ICs substantially reduces the size of power adapters by combining a high switching frequency of up to 140 kHz with a high level of integration. This combination significantly lowers both the component volume and the PCB area required for typical adapter implementations.
InnoSwitch5-Pro ICs employ advanced SR FET control to ZVS in discontinuous conduction mode, enhancing overall system efficiency to exceed 95%. This efficiency allows designers to eliminate the use of heat sinks, spreaders, and potting materials for thermal management, thereby further reducing size, component costs, and manufacturing complexity.
The use of ZVS and GaN technology transforms power supply design, virtually eliminating switching losses and capitalizing on the low conduction losses of GaN. This enables the implementation of extremely compact adapter layouts with significantly fewer components compared to asymmetric half-bridge (AHB) circuits or active clamp alternatives. Additionally, the integration of a PowiGaN primary switch and controller, isolated feedback, and a secondary controller with an I²C interface simplifies the development and manufacturing of fully programmable, highly efficient power supplies.
With the European Union adopting USB-C as the common charging standard and China promoting the new Universal Fast Charging Specification (UFCS), design engineers require versatile power conversion devices to develop ultra-compact adapters. The sophisticated control functions available through the I²C communication bus, which supports fine adjustments of output voltage and current in increments of 10 mV and 30 mA respectively, facilitate compliance with the strict accuracy and tolerance demands of all major fast-charging protocols.
Reference designs and kits
RDK-1002 - 140 W USB PD 3.1 EPR Power Supply
- InnoSwitch5-Pro (INN5377F-H905)
- HiperPFS-5 power factor correction IC (PFS5277F)
- ZVS in DCM with no active clamping
- Natively supports 28 V USB PD EPR
- >95% full load efficiency at 28 V / 5A, 230 VAC
- >94% full load efficiency at 28 V / 5 A, 90 VAC
- <50 mW no-load input power
- Universal input: 90 to 265 VAC
- 4.2 cubic inches using only 106 components
Key features
- Zero voltage switching (ZVS) using advanced SR FET control – no active clamp requiredo
- Supports very wide output voltage range 3 V to 30 V
- Lossless input line voltage sensing on the secondary-side
- Adaptive DCM/CCM/ZVS control
- Native support for 28 V USB PD Extended Power Range (EPR)
- Enables <2% CC accuracy for UFCS protocolDual-mode flyback controller
- Less than 30 mW no-load including line sense and MCU
- Highest level of integration
- Robust 750 V and 900 V PowiGaN primary switch options
- Steady-state switching frequency up to 140 kHz minimizes transformer size
- Synchronous rectification driver and secondary-side sensing
- Integrated FluxLink, HIPOT-isolated, feedback link
- Integrated 3.6 V supply for external MCU
- Digitally controlled via I²C interface
- Precise CV, CC, CP Control
- Dynamic adjustment of power supply voltage and current
- Selectable DCM-only operation to reduce SR FET voltage stress
- Optimized command set to reduce I²C traffic
- Telemetry for power supply status and fault monitoring
Applications
- High-density power adapters
- Multiprotocol adapters: USB PD+PPS, 28V EPR, QC, VOOC, VFC, SCP, UFCS
- High-power USB PD wall outlets
- Direct-charge mobile device chargers
- General-purpose battery chargers
- Adjustable CV and CC LED ballast
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