Automotive linear optocoupler offers fast response and high isolation voltage
The Vishay VOA300 ensures fast data transfer and stable gain over temperature, to provide for reliable and timely detection of power faults in electric vehicle battery systems.
Vishay has introduced the industry’s first AEC-Q102 qualified linear optocoupler, providing a high-performance option for galvanically isolated current and voltage measurement in electric vehicles.
Offering an industry-high isolation voltage of 5,300 Vrms, the VOA300 provides a response time five times faster than competing devices. At the same time, the optocoupler offers high transfer gain stability of 0.005%/°C, and a single-ended output for design flexibility. This output can be directly connected to an amplifier stage or an ADC.
The fast response time enables quick detection of voltage and current ripples to trigger battery cut-off mechanisms, or eFuses, which protect passengers and vehicles.
The VOA300’s feedback photodiode captures a portion of the LED’s flux and generates a control signal that is used to servo the LED drive current, while the photodiode produces an output signal that has a linear relation to the servo optical flux generated by the LED.
The time and temperature stability of the input-output coupler is ensured by using matched PIN photodiodes that accurately track the output flux of the LED.