News: Microelectronics
25 May 2021
Power Integrations launches InnoSwitch4-CZ flyback switcher ICs for mobile chargers
Power Integrations of San Jose, CA, USA, which provides high-voltage integrated circuits for energy-efficient power conversion, has launched the InnoSwitch4-CZ family of high-frequency, zero-voltage switching (ZVS) flyback switcher ICs.
InnoSwitch4-CZ devices incorporate a robust 750V primary switch using Power Integrations’ PowiGaN technology and a novel high-frequency active clamp flyback controller to facilitate a new class of ultra-compact chargers suitable for phones, tablets and laptops. The first consumer devices based on InnoSwitch4-CZ devices have been introduced by mobile charger product maker Anker.
“PowiGaN switches, in conjunction with our active clamp solution – ClampZero – enable a highly efficient design and an extremely compact form factor,” says CEO Balu Balakrishnan.
“We are excited to work with Power Integrations as their exclusive launch partners for their InnoSwitch4 chipsets,” says Anker’s CEO Steven Yang. “The InnoSwitch4-CZ was a natural choice for Anker’s new Nano II series of USB-C chargers,” he comments. “Its outstanding levels of integration and efficiency are key to the Nano II series’ extremely compact design.”
The InnoSwitch4-CZ family incorporates 750V switch, primary and secondary controllers, ClampZero interface, synchronous rectification, and safety-rated feedback in a single, compact InSOP-24D package. A steady-state switching frequency of up to 140kHz minimizes transformer size, further increasing power density.
In contrast with older active clamp flyback approaches, the InnoSwitch4-CZ and ClampZero combination provides up to 95% efficiency and maintains very high efficiency across variations in line voltage, system load and output voltage. This is achieved with variable-frequency asymmetrical control of the active clamp with intelligent zero-voltage switching, enabling both discontinuous and continuous conduction modes of operation, greatly enhancing design flexibility and maximizing efficiency across the entire operating envelope.
The new flyback switcher ICs enable what is claimed to be exceptional CV/CC accuracy, independent of external components, and consume less than 30mW no-load including line-sensing safety and protection features.
Targeting high-efficiency compact USB PD adapters, high-density flyback designs up to 110W and high-efficiency CV/CC power supplies, InnoSwitch4-CZ ICs provide variable output voltage and constant current profiles. Devices are fully protected, featuring auto-restart or latching fault response for output over-voltage and under-voltage protection, multiple output under-voltage fault thresholds and latching or hysteretic primary over-temperature protection.
The new InnoSwitch4-CZ ICs are priced at $3.85 per unit in 10,000-unit quantities.
Power Integrations expands range of InnoSwitch3 ICs incorporating robust 750V GaN transistors
Power Integrations launches GaN-based InnoSwitch3 AC-DC converter ICs
