Temperature compensated circuit for controlling load current

Details Temperature compensated circuit for controlling load current Temperature compensated circuit for controlling load current

1991-10-24

1993-08-17

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323907, 323282, 361154, G05F 1565

Patent

active

052372626

ABSTRACT:
A temperature compensated control circuit includes a load transistor which passes the load current and has an on-resistance which varies with temperature. To provide temperature compensation, first and second pilot transistors are integrated with the load transistor such that as the load transistor heats-up due to the load current passing through the on-resistance of the load transistor, the first and second pilot transistors heat-up due to heat conduction from the load transistor. Each of the pilot transistors has an on-resistance which varies proportionally or similarly to the on-resistance of the load transistor. A first current source supplies a first level of current to the on-resistance of the first pilot transistor to develop a first reference voltage, and a second current source supplies a second level of current to the on-resistance of the second pilot transistor to develop a second reference voltage. The range between the first and second reference voltages corresponds to an acceptable range of load current. A voltage corresponding to the load current is sensed across the load transistor, and the control circuit controls the load current to maintain the sensed voltage within the range.

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