Photovoltaic MOSFET driver for the automotive industry

Rutronik now includes the VOMDA1271 from Vishay in its portfolio. The device is an automotive-certified MOSFET driver with an integrated fast turn-off. It draws all the current needed to drive its internal circuits from the infrared emitter on the low-voltage primary side of the isolation barrier. No external power supply is necessary to provide VCC, making the optically isolated MOSFET driver more cost-effective. It is simple to use, AEC-Q102 certified and comes in a space-saving SOP-4 package.

The driver has an integrated fast turn-off, which only requires 0.7ms (typ.) to switch off and offers a switch-on time of 0.05ms. The components have a photovoltaic gate array and, therefore, do not necessitate an extra power supply to ensure the required insulation test voltage of 3.75VRMS. The resulting simplified design facilitates lower costs and decreases space requirements.

The optically insulated drivers operate reliably in a wide temperature range from -40C to +125C, making them excellent for use in automotive charging technology. The components are also MCU-compatible.

Benefits at a glance include an integrated switch-off circuit with open circuit voltage of 8.5V typical at IF = 10mA, and short-circuit current at 15μA typical at IF = 10mA.

Typical applications include vehicle pre-charging relay, powerwall chargers, gate drivers for high-voltage MOSFETs, BMS, and customised SSRs.