Dynamically configurable off-line switcher for USB PD 3.0
The InnoSwitch3-Pro integrated switcher enables digital micro-stepping of voltage and current for precise battery charge control and elimination of DC-DC post-regulators. It achieves up to 94% efficiency across line and load conditions with precise, dynamically adjustable, control of voltage in 10 mV steps and current in 50 mA steps via a simple two-wire I2C interface.
Devices may be paired with a microcontroller or take inputs from the system CPU to control and monitor the off-line power supply. Applications include virtually any rapid-charging protocol, including USB Power Delivery (PD) 3.0 + PPS, Quick Charge 4/4+, AFC, VOOC, SCP, FCP and other industrial and consumer battery chargers, dimmable LED ballast drivers and field-configurable industrial power supplies.
The devices inlude a microprocessor VCC supply to avoid the need for an external LDO, and also include an N-channel FET driver which may be used to enable or disable the main power output. Together with integrated bus voltage, current and fault-reporting telemetry and dynamically configurable protection functions such as OTP, line OV/UV, output OV/UV, and short-circuit, the component count for an offline power supply is significantly reduced and design complexity is dramatically simplified.
“The AC-DC power conversion market is undergoing rapid transition with system designers needing a programmable solution that can adapt to various fast-charging protocols including the recently completed USB PD 3.0 + PPS specification.” said Shyam Dujari, director of product marketing for Power Integrations. “The ability to precisely control the output voltage and current of a power supply over a wide range is also useful for designers of specialized applications with smaller production runs, as they can easily configure a single board design for multiple product SKUs using software either at manufacture or during installation.”
The devices use Power Integrations’ FluxLink high-speed digital communications technology coupled with synchronous rectification, quasi-resonant switching and a precise secondary-side feedback sensing and feedback control circuit. They are UL recognized and TUV (EN60950) approved to bridge the isolation barrier and the InSOP-24D package also provides a low-profile, thermally efficient solution with extended creepage (>11.5 mm) and clearance between primary and secondary sides for high reliability, surge protection and ESD robustness.
Samples are available now, priced at $1.12 in 10,000-piece quantities.
www.power.com/products/innoswitch/innoswitch3-pro
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