High efficiency, single-channel gate drivers for silicon carbide SiC MOSFETs from Power Integrations are now qualified to AEC-Q100 for automotive use.
The SIC118xKQ SCALE-iDrivers family can be configured to support gate-drive voltage requirements of commonly used SiC MOSFETs alongside additional safety and protection features.
The SIC1182KQ (1200 V) and SIC1181KQ (750 V) SCALE-iDriver devices are optimized for driving SiC MOSFETs in automotive applications, exhibiting rail-to-rail output, fast gate switching speed, unipolar supply voltage supporting positive and negative output voltages, integrated power and voltage management and reinforced isolation.
Critical safety features include Drain to Source Voltage (VDS) monitoring-, SENSE readout, primary and secondary Undervoltage Lock-out (UVLO), current-limited gate drive and Advanced Active Clamping (AAC) which facilitates safe operation and soft turn-off -under fault conditions. AAC in combination with VDS monitoring ensures safe turn-off in less than 2 µs during short-circuit conditions. Gate-drive control and AAC features allow gate resistance to be minimized; this reduces switching losses, maximizing inverter efficiency.
Pairing the SCALE-iDriver control and safety features with high-speed FluxLink communication technology improves isolation capability, and enables safe, cost-effective designs for inverters with very few external components up to 300 kW.
“Silicon carbide MOSFET technology opens the door for smaller, lighter automotive inverter systems. Switching speeds and operating frequencies are increasing; our low gate resistor values maintain switching efficiency, while our fast short circuit response quickly protects the system in the event of a fault,” said Michael Hornkamp, senior director of marketing for automotive gate-driver products at Power Integrations.
“Furthermore, SCALE-iDriver sets a new standard in isolation robustness for functional safety; even if a power device causes catastrophic driver failure, SCALE-iDriver’s isolation remains intact ensuring that no part of the chassis will carry life-threatening high voltages,” he said.
The single-channel SIC118xKQ gate drivers provide up to 8 A and suit SiC MOSFETs with standard gate-emitter voltages from +15 V, with various negative voltages in the range from -3 V to -15 V.