Avago Technologies rolled out three new digital optocouplers optimised for use in onboard chargers and other high-voltage systems in hybrid and electric vehicles. The new ACPL-K4xT devices are qualified to AEC-Q100 grade stress test requirements for automotive applications. They offer robust working voltage performance up to 1140 V, allowing standardisation of battery management solutions for mid-voltage car batteries, high-voltage bus and truck batteries, and even future high-voltage battery topologies.
The optocouplers are part of Avago’s R2Coupler family with reinforced insulation for reliable signal isolation, which is critical for onboard chargers for plug-in electric vehicles and other automotive and high-temperature industrial applications. Onboard chargers take in high-voltage, high-current supply to charge quickly, demanding robust isolation of peak transients up to 8 kV.
The reinforced insulation of the optocouplers meets these stringent requirements, delivering safe electrical signal isolation 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 minimised as low as 1,5 mA/channel for low-speed switching operation.
The single-channel ACPL-K43T and dual-channelACPL-K44T each operate at 1 MBd, while the single-channel ACPL-K49T operates at 20 kBd.
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