Device for monitoring chip temperature

摘要

A device for monitoring chip temperature of a switch output stage having a switch element (100, 106) that has a first circuit (10) for generating a signal (pvon) corresponding to the dissipated power of the switch element (100-106) during an on state. The device has a second circuit (20) for generating a signal (pv1, pv2; pv'1) corresponding to the dissipated power of the switch element (100-106) during a turn-on and/or turn-off event. The device further has a summer (40) that sums the signals (pvon, pv1, pv2; pvon pv'1) of the first and second circuits (10, 20) in weighted fashion and outputs a sum signal (pvsum) corresponding to the dissipated power of the switch element (100-106). The device also has an integrator (60) that responds to the sum signal (pvsum) and outputs an output signal (th) corresponding to the chip temperature of the switch element (100-106). Such a device is suitable for temperature monitoring in realtime at switch output stages having variable switching frequency.