Flyback switcher ICs boost efficiency
InnoSwitch5-Pro programmable flyback switchers from Power Integrations employ zero-voltage switching and SR FET control to achieve >95% efficiency. A switching frequency of up to 140 kHz and a high level of integration combine to reduce the component volume and PCB board area required by a typical USB PD adapter implementation.
The single-chip switchers incorporate a 750-V or 900-V PowiGaN primary switch, primary-side controller, FluxLink isolated feedback, and secondary controller with an I2C interface. They can be used in single and multiport USB PD adapters, including designs that require the USB PD Extended Power Range (EPR) protocol.
Devices accommodate a wide output voltage range of 3 V to 30 V. To maximize efficiency, the switchers support lossless input line voltage sensing on the secondary side for adaptive continuous conduction mode (CCM), discontinuous conduction mode (DCM), and zero voltage sensing (ZVS) control. A post-production tolerance offset enables constant-current accuracy of <2% to support the Universal Fast Charging Specification (UFCS) protocol.
Prices for the InnoSwitch5-Pro flyback switcher ICs start at $2.40 each in lots of 10,000 units.
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