Driver circuit for field-effect-controlled power semiconductor switch

摘要

The power MOSFET (1) has its gate electrode connected (17) to a pref. integrated current limiter (14) comprising a depletion-mode FET (18) in parallel with an enhancement-mode FET (19), the source electrode being connected to the MOSFET gate by a resistor (20). The depletion-mode FET functions as a current source setting a lower speed for switching-on the MOSFET. The enhancement-mode FET conducts when the control signal (16) is set to zero, giving a higher speed for switching-off.