Method and apparatus providing final test and trimming for a power supply controller
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01H-037/76
H01H-037/00
H01H-065/00
출원번호
US-0789924
(2007-04-25)
등록번호
US-7400483
(2008-07-15)
발명자
/ 주소
Balakrishnan,Balu
Dienguerian,Alex B.
Bircan,Erdem
출원인 / 주소
Balakrishnan,Balu
Dienguerian,Alex B.
Bircan,Erdem
대리인 / 주소
Blakely Sokoloff Taylor & Zafman LLP
인용정보
피인용 횟수 :
10인용 특허 :
15
초록▼
A power supply controller having final test and trim circuitry. In one embodiment, a power supply controller for switched mode power supply includes a selector circuit, a trim circuit, a shutdown circuit and a disable circuit. The trim circuit includes a programmable circuit connection that can be s
A power supply controller having final test and trim circuitry. In one embodiment, a power supply controller for switched mode power supply includes a selector circuit, a trim circuit, a shutdown circuit and a disable circuit. The trim circuit includes a programmable circuit connection that can be selected by the selector circuit by toggling a voltage on an external terminal such as for example a power supply terminal, a control terminal or a function terminal of the power supply controller. The programmable circuit connection in the trim circuit can be programmed by applying a programming voltage to the external terminal. The shutdown circuit shuts down the power supply controller if the temperature rises above an over temperature threshold voltage. The shutdown circuit includes adjustment circuitry that can be used to test the shutdown circuit. The adjustment circuitry can adjust and reduce the over temperature threshold of the power supply controller. Thus, the power supply controller can be tested without having to actually heat the part. The disable circuit includes a programmable circuit connection, which when programmed prevents further trimming of power supply controller and prevents adjustment of the shutdown circuit over temperature threshold.
대표청구항▼
What is claimed is: 1. A power supply controller circuit, comprising: a selector circuit coupled to an external terminal of the power supply controller circuit; a shutdown circuit coupled to the external terminal and the selector circuit; a trim circuit coupled to the external terminal and the sele
What is claimed is: 1. A power supply controller circuit, comprising: a selector circuit coupled to an external terminal of the power supply controller circuit; a shutdown circuit coupled to the external terminal and the selector circuit; a trim circuit coupled to the external terminal and the selector circuit; and a disable circuit coupled to the external terminal, the selector circuit, the shutdown circuit and the trim circuit, wherein the selector circuit includes: a hysteretic comparator coupled to the external terminal; a counter coupled to an output of the hysteretic comparator; and a decoder coupled to an output of the counter, the decoder having a decoder circuit select line coupled to the disable circuit, the shutdown circuit select line coupled to the shutdown circuit and a trim circuit select line coupled to the trim circuit. 2. The power supply controller circuit of claim 1, wherein the external terminal is a terminal of the power supply controller circuit selected from the group consisting of: a power supply terminal, a control terminal and a function terminal. 3. The power supply controller circuit of claim 1, wherein the trim circuit comprises a plurality of trim circuits and the selector circuit is configured to select at least one of the plurality of trim circuits to be programmed in response to the signal on the external terminal. 4. The power supply controller circuit of claim 3, wherein the power supply controller circuit is configured to operate with a first voltage at the external terminal, wherein the selector circuit is configured to select at least one of the plurality of trim circuits to be programmed in response to the signal on the external terminal changing between a second voltage and a third voltage. 5. The power supply controller circuit of claim 1, wherein the shutdown circuit is configured to disable the power supply controller circuit if a temperature of the shutdown circuit rises above a first threshold temperature. 6. The power supply controller circuit of claim 5 wherein the shutdown circuit comprises adjustment circuitry coupled to the external terminal, the adjustment circuitry configured to adjust the first threshold temperature to a second threshold temperature or a third threshold temperature in response to a signal on the external terminal, the first threshold temperature greater than the second threshold temperature and the second threshold temperature greater than the third threshold temperature. 7. The power supply controller circuit of claim 1 wherein the shutdown circuit comprises: a first current source coupled to the external terminal; a first transistor coupled between the first current source and a ground terminal; a second current source coupled between the external terminal and a control terminal of the first transistor; a first resistor coupled between the second current source and the ground terminal; and an adjustment circuit coupled between the external terminal and the first resistor, the adjustment circuit coupled to the disable circuit. 8. The power supply controller circuit of claim 7 wherein the adjustment circuit comprises: a third current source coupled to the external terminal; a second transistor coupled between the third current source and the first resistor, a control terminal of the second transistor coupled to the disable circuit; a fourth current source coupled to the external terminal; and a third transistor coupled between the fourth current source and the second transistor, a control terminal of the third transistor coupled to the shutdown circuit select line of the decoder. 9. The power supply controller circuit of claim 1, wherein the trim circuit comprises a plurality of trim circuits, each including a first programmable circuit connection to be programmed in response to a signal on the external terminal. 10. The power supply controller circuit of claim 9, wherein the programmable circuit connections are configured to pass a programming current through the first programmable circuit connection of the respective trim circuit to program the first programmable circuit connection in response to a programming voltage. 11. The power supply controller of claim 9, wherein each programmable circuit connection is to add a circuit path to a respective trim circuit in response to the signal on the external terminal. 12. The power supply controller of claim 9, wherein each programmable circuit connection is to remove a circuit path from a respective trim circuit in response to the signal on the external terminal. 13. The power supply controller circuit of claim 9, wherein the disable circuit comprises a second programmable circuit connection configured to disable the first programmable circuit connection of each of the plurality of trim circuits from being programmed in response to the signal on the external terminal. 14. The power supply controller circuit of claim 1, wherein the trim circuit comprises: a fifth current source coupled to the ground terminal; a fourth transistor coupled between the external terminal and the fifth current source; a first programmable circuit connection coupled to the external terminal; a fifth transistor coupled between the first programmable circuit connection and fifth current source, a control terminal of the fifth transistor coupled to a control terminal of the fourth transistor; a sixth transistor coupled between the first programmable circuit connection and the ground terminal; a seventh transistor coupled between a trim circuit select line of the decoder and a control terminal of the sixth transistor; and a sixth current source coupled between the control terminal of the sixth transistor and the ground terminal. 15. The power supply controller circuit of claim 1 wherein the disable circuit comprises: a second programmable circuit connection coupled to the external terminal; a seventh current source coupled between the second programmable circuit connection and the ground terminal; an eighth transistor coupled between the second programmable circuit connection and the ground terminal; an eighth current source coupled between a control terminal of the eighth transistor and the ground terminal; and a ninth transistor coupled between a disable circuit select line of the decoder and the eighth current source. 16. The power supply controller circuit of claim 1 wherein the trim circuit comprises: a tenth transistor coupled between the external terminal and a reference current source, a control terminal of the tenth transistor coupled to the reference current source; a third programmable circuit connection coupled to the external terminal; a ninth current source coupled to the ground terminal; an eleventh transistor coupled between the third programmable circuit connection and the ninth current source, a control terminal of the eleventh transistor coupled to the control terminal of the tenth transistor and the reference current source; a tenth current source coupled to the ground terminal; a twelfth transistor coupled between the third programmable circuit connection and the ground terminal, a control terminal of the twelfth transistor coupled to the tenth current source; and a thirteenth transistor coupled between a trim circuit select line of the decoder and the tenth current source, a control terminal of the thirteenth transistor coupled to the decoder circuit. 17. The power supply controller circuit of claim 1 further comprising: a power switch coupled between a drain terminal of the power supply controller and the ground terminal; a pulse width modulator circuit; an AND gate having an output coupled to a control terminal of the power switch, the AND gate having a first input coupled to an output of the pulse width modulator circuit, the AND gate having a second input coupled to the over temperature circuit; a fourteenth transistor coupled between the external terminal and the trim circuit; a first inverter having an output coupled to a control terminal of the fourteenth transistor and having an input coupled to the disable circuit; a comparator having an input coupled to the external terminal; a second inverter having an input coupled to an output of the comparator and an output coupled to the disable circuit; and a fifteenth transistor coupled between the output of the second inverter and the trim circuit, the fifteenth transistor having a control terminal coupled to the disable circuit. 18. The power supply controller circuit of claim 1, wherein the trim circuit comprises a first programmable circuit connection and the disable circuit comprises a second programmable circuit connection, wherein the disable circuit is configured to disable the first programmable circuit connection from being programmed in response to a signal on the external terminal.
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