ELECTRONIC CIRCUIT CONTROL ELEMENT WITH TAP ELEMENT
First Claim
1. A high voltage transistor, comprising:
- an N+ drain region;
an N+ source region;
an N+ tap region;
a P type body region adjoining the N+ source region;
an N−
drift region extending from the drain region to the P type body region;
an N−
tap drift region extending from the N+ drain region to the N+ tap region, wherein the N+ tap region adjoins the N−
tap drift region at an end of the N−
tap drift region opposite the N+ drain region; and
an insulated gate adjacent the P type body region.
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Abstract
A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main terminals, a control terminal and a tap terminal. A control circuit is coupled to the control terminal. The tap terminal and the second main terminal of the power transistor are to control switching of the power transistor. The tap terminal is coupled to provide a signal to the control circuit substantially proportional to a voltage between the first and second main terminals when the voltage is less than a pinch off voltage. The tap terminal is coupled to provide a substantially constant voltage that is less than the voltage between the first and second main terminals to the control circuit when the voltage between the first and second main terminals is greater than the pinch-off voltage.
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Citations
14 Claims
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1. A high voltage transistor, comprising:
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an N+ drain region; an N+ source region; an N+ tap region; a P type body region adjoining the N+ source region; an N−
drift region extending from the drain region to the P type body region;an N−
tap drift region extending from the N+ drain region to the N+ tap region, wherein the N+ tap region adjoins the N−
tap drift region at an end of the N−
tap drift region opposite the N+ drain region; andan insulated gate adjacent the P type body region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification