Vishay Intertechnology has introduced the VOLA617A, an automotive-grade phototransistor optocoupler built to provide galvanic signal isolation in electric vehicles, including emerging 800 V battery architectures, and in industrial automation systems. Its defining feature is the ability to isolate DC voltages up to 1,000 V. Vishay says most automotive optocouplers can’t be used above 500 V, which confines them to traditional 400 V EV platforms.
The device pairs an isolation voltage of 5,000 VRMS with a VIORM of 1,414 Vpeak and a VIOTM of 8,000 Vpeak, housed in a four-pin LSOP low profile package. Creepage and clearance distances are ≥ 8 mm. Internally, an infrared emitting diode is optically coupled to a silicon planar phototransistor detector. The VOLA617A comes in four current transfer ratio (CTR) ranges and carries an 80 V collector-emitter voltage rating, which Vishay says gives designers more flexibility.
The optocoupler operates from -40° C to +125° C and has a junction temperature capability up to +145° C. Coupling capacitance is low at 0.5 pF, and Vishay says the part offers high common-mode transient immunity.
In an EV, an optocoupler passes a control or feedback signal across an isolation barrier so a fault on the high-voltage battery side can’t reach the low-voltage control electronics. The move to 800 V architectures, which enable faster charging and lighter wiring, increases the isolation that components on that boundary must withstand.
Applications for the optocoupler include grid-connected on-board chargers, DC/DC converters, battery management systems and isolated wake-up signals, along with other system-control functions that need galvanic and noise isolation. Vishay says the part meets dual AEC-Q102 qualification and lists it as RoHS-compliant and halogen-free.
Samples and production quantities are available, and lead time is eight weeks.
Source: Vishay Intertechnology
from Charged EVs https://ift.tt/lcXRZTE
No comments:
Post a Comment