optocouplers for hybrid vehiclesAvago Technologies announced three new digital optocouplers optimized for use in onboard chargers and other high-voltage systems in hybrid and electric vehicles. The new ACPL-K4xT optocouplers are qualified to AEC-Q100 Grade 1 stress test requirements for automotive applications. The devices offer robust working voltage performance up to 1140 V, allowing standardization of battery management solutions for mid-voltage car batteries, high-voltage bus and truck batteries, and even future high voltage battery topologies. The ACPL-K4xT devices are part of the Avago R2Coupler family of optocouplers with reinforced insulation for reliable signal isolation. Onboard chargers take in high-voltage, high-current supply to charge quickly, demanding robust isolation of up to 8 kV peak transients. The reinforced insulation of the optocouplers is asserted to meet these stringent requirements over a wide operating temperature range from -40°C to +125°C. Additionally, the devices’ small surface-mount package meets the 8 mm creepage and clearance distance required for high-voltage safety regulations.

The low power consumption of the ACPL-K4xT optocouplers helps prevent battery management systems from draining vehicle batteries. The devices feature no quiescent current and thus do not draw power in the “off” state. Also, the current consumption of both their LED and detector IC can be minimized as low as 1.5mA/channel for low-speed switching operation.

“Our new R2Coupler devices mark another industry-first for Avago and extend our leading automotive-grade solutions for higher-voltage systems in the hybrid and electric vehicle market,” said Cheng-Dee Lee, Business and Applications Development Director for Isolation Products at Avago. “We continue to grow the list of manufacturers and tier one suppliers using R2Coupler isolation products, as we now address high-voltage battery modules and onboard quick chargers, as well as bus and trucks systems.”

The ACPL-K4xT optocouplers are compliant to multiple safety standards, including UL 1577 at 5kVRMS/1 minute, IEC 60747-5-5 with an 8kVpeak transient rating for up to 1140V working voltage, EN/DIN EN 60747-5-2 and CSA. The single-channel ACPL-K43T device and dual-channel ACPL-K44T device each operate at 1 MBd, while the single-channel ACPL-K49T device operates at 20 kBd.

Avago Technologies
800-235-0312, www.avagotech.com