May 2020

14 INDUSTRY NEWS Issue 2 2020 Power Electronics Europe www.power-mag.com current, the peak current will be internally limited to a safe value. Short-circuit protection The SIC118xKQ uses the semiconductor device drain to source voltage to detect a short-circuit utilizing a sensing resistor network. With the help of a well stabilized V VISO and a Schottky diode connected between semiconductor device gate and VISO the V GS is clamped to the regulated VISO and the short-circuit current as well related SiC semiconductor energy will be limited. During the off-state, SNS is internally connected to the COM pin. In case an optional filter-capacitor is applied between SNS pin and COM this capacitor is discharged. When the driver is in turn-on transition or in on- state, the short-circuit detection algorithm through SNS is activated after an ASIC internally blanking time has elapsed. If now a voltage drop of about 0.4 V (typically) is detected at SNS referenced to VEE, this is interpreted as a detected short-circuit. The driver initiates a short-circuit turn-off without receiving a primary-side command. A fault command is sent to the primary side and SO is pulled to GND for typically 10 s. During this time the driver ignores any command signal at the IN pin. In parallel to the short-circuit turn-off transition phase, the iDriver’s internal Advanced Active Clamping over-voltage limitation scheme is activated. If the driver is in turn-off transition or in off-state the over-voltage limitation algorithm is activated at SNS and the internal reference is COM. In case a current of typically 440 A (turn-off transition) to 520 A (off-state) is feed to SNS, the driver will regulate the gate current to limit the turn-off di/dt and therefore the over-voltage at drain to source during turn-off. In case the semiconductor device offers a so called current-sense terminal, this signal can be fed into SNS with reference to VEE. A voltage of about 0.4 V at SNS with reference to VEE will now be handled as an over-current. That leads to an over- current turn-off, following the same scheme as for a short-circuit condition. More details: www.power.com/products/scale-idriver-ic- family/sic118xkq/ SCALE-iDriver functional block diagram SCALE-iDriver typical application diagram

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