# US 2008/0186747 A1 · Method and apparatus providing a multi-function terminal for a power supply controller

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- Number: US 2008/0186747 A1
- Document ID: US20080186747A1
- Status: Published application
- Kind: A1
- Application number: 11/825,903
- Filed: 2007-07-09
- Published: 2008-08-07
- Earliest claimed: 1999-09-24
- Assignees: Power Integrations, Inc.
- Inventors: Balu Balakrishnan; Alex B. Djenquerian; Leif O. Lund
- Web page: https://patentgrep.com/patent/US20080186747A1

## CPC

- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A power supply controller circuit in one embodiment comprises a power switch, a multifunction circuit, and a control circuit. The power switch comprises a source and a drain respectively coupled to first and second terminals of the power supply controller circuit. The multifunction circuit comprises a first input that is coupled to a third terminal of the controller circuit, wherein the third terminal is to receive a first current control signal, and wherein the multifunction circuit is to generate a second current control signal in response to the first current control signal. The control circuit generates a switching waveform to drive a control input of the power switch in response to: an oscillating signal, a signal that is representative of current flowing through the power switch, and the second current control signal.

## Claims

### Claim 1

A power supply controller circuit, comprising:
a power switch comprising a source and a drain respectively coupled to first and second terminals of the power supply controller circuit;
a multifunction circuit comprising a first input that is coupled to a third terminal of the controller circuit, wherein the third terminal is to receive a first current control signal, and wherein the multifunction circuit is to generate a second current control signal in response to the first current control signal; and
a control circuit to generate a switching waveform to drive a control input of the power switch in response to an oscillating signal, a signal that is representative of current flowing through the power switch, and the second current control signal.

### Claim 2 (depends on 1)

The power supply controller circuit of claim 1 wherein the control circuit comprises a latch that is coupled to be toggled to a first logic state in response to the oscillating signal and to be toggled to a second logic state in response to the signal representative of the current through the power switch.

### Claim 3 (depends on 2)

The power supply controller circuit of claim 2 wherein the control circuit generates the switching waveform in response to the output of the latch and the second current control signal.

### Claim 4 (depends on 2)

The power supply controller circuit of claim 2 wherein the latch is coupled to be toggled in response to a leading edge blanking delay of the switching waveform.

### Claim 5 (depends on 1)

The power supply controller circuit of claim 1 wherein the control circuit adjusts a duty cycle of the switching waveform.

### Claim 6 (depends on 1)

The power supply controller circuit of claim 1 wherein the control circuit generates a second current control signal in response to a start-up of the power supply controller circuit.

### Claim 7 (depends on 1)

The power supply controller circuit of claim 1 wherein the control circuit generates a second current control signal in response to a disable signal for the power supply controller circuit.

### Claim 8 (depends on 1)

The power supply controller circuit of claim 1 wherein the third terminal is a multifunction terminal.