Flyback switcher for electric vehicle safety designs: Page 2 of 2

July 16, 2020 //By Nick Flaherty
The InnoSwitch3-AQ from Power Integrations achieves Q100 qualification and operates from 30 V to 550V DC input with ±3 percent accurac
The InnoSwitch3-AQ flyback switcher from Power Integrations achieves Q100 qualification and operates from 30 V to 550V DC input with ±3 percent accuracy
at low traction the power supply can easily respond – the bandwidth of the feedback loop can easily go up to more than 20kHz,” he added.   

“Right now for a consumer vehicle the 400V bus can go up to 550V so the AQ is rated for 750V right now and it can scale up to emergency power supply for 800V bus,” he said.

The integrated 750 V MOSFET in the flyback switcher meets stringent automotive de-rating requirements, and an on-chip synchronous rectifier controller delivers above 90 percent efficiency at the nominal 400 VDC input voltage with less than 10 mW no-load energy usage across the input voltage range.

The InnoSwitch3-AQ family ICs are packaged in a surface-mount InSOP with 11 mm primary to secondary creepage, which exceeds the stringent requirements for high altitude (5000 m) isolation.

The DER-840Q reference design incorporates the InnoSwitch3-AQ and demonstrates start-up, shutdown and efficient operation from 30 VDC to 550 VDC input, as well as fast transient response and a variety of safety and protection features. A 'StackFET' can be added alongside the AQ chiip to support 800V designs, simplifying the bill of materials across a range of vehicles. 

The InnoSwitch3-AQ is available in the InSOP-24D package. Devices are available now with prices starting at $2.75 in 10,000-piece quantities

ac-dc.power.com/products/innoswitch3-aq

 

Picture: 
The InnoSwitch3-AQ operates from 30 V to 550V DC input with ±3 percent accuracy

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