Monolithically integrated mos output-stage component having an e

Details Monolithically integrated mos output-stage component having an e Monolithically integrated mos output-stage component having an e

1993-10-14

1996-09-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 18, H02H 300

Patent

active

055551521

ABSTRACT:
A monolithically integrated MOS output-stage component, particularly a DMOS output stage, includes an output-stage element having a GATE connection, a SOURCE connection, and a DRAIN connection, and also includes an excess-temperature protection device. An integrated GATE-protection resistor is provided. The excess-temperature protection device is also integrated in the output-stage component and includes a series connection of a Zener-diode with a temperature-dependent resistor having a positive temperature coefficient. The resistor is coupled with the SOURCE connection while the Zener-diode is coupled with an outer GATE connection. The series connection is provided with a supply voltage. Furthermore, the excess-temperature protection device contains a semiconductor arrangement controlled by a control voltage at the tap node of the series connection. The semiconductor arrangement reduces the GATE voltage upon the occurrence of excess temperatures. In this way, an evaluation signal having a high total slope with respect to temperature is obtained with only slight requirements for the temperature-dependent resistor. Tank leakage currents are compensated for. The output-stage component is completely integratable in a simple manner and, thus, can be manufactured at favorable cost.

REFERENCES:
patent: 3906310 (1975-09-01), Esashika
patent: 4777518 (1988-10-01), Mihara et al.
patent: 4896245 (1990-01-01), Qualich
patent: 5008736 (1991-04-01), Davies et al.

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