Power converter controller

1. A power supply, comprising:

a controller, comprising:

a first switch coupled between a first node and a second node;

a first resistor coupled between the second node and a third node;

a second resistor coupled between the first node and a fourth node;

a capacitor coupled between the fourth node and a fifth node;

an amplifier coupled at a first input to the fourth node, at a second input directly to the third node, and at an output to the fifth node; and

a comparator coupled at a first input to the fifth node and at a second input directly to the third node.

2. The power supply of claim 1 , wherein the controller is configured to receive a reference current at the first node.

3. The power supply of claim 1 , wherein the controller is configured to receive a bias voltage at the third node.

4. The power supply of claim 1 , wherein the controller is configured to couple to a sense element at the fourth node to subtract a sensed current from the fourth node.

5. The power supply of claim 1 , further comprising a latch coupled at a reset input to an output of the comparator, wherein the latch is configured to control a power converter at least partially based on a signal provided at the output of the comparator.

6. The power supply of claim 1 , further comprising a power converter.

7. The power supply of claim 1 , further comprising a second switch coupled between the first node and the second resistor.

8. The power supply of claim 1 , further comprising a second capacitor coupled between the first node and the third node.

9. The power supply of claim 1 , wherein the first switch is coupled to a control signal for a first power transistor of a power converter.

10. A controller, configured to:

receive a reference current at a first node;

divide the reference current to form a divided reference current by controlling a switch based on a phase of operation of a power converter, wherein the switch is coupled between the first node and a second node, and wherein a first resistor is coupled between the second node and a third node;

subtract a sensed current from the divided reference current to form a difference current, wherein the sensed current is provided to a current limiter at a fourth node by a sense element, and wherein a second resistor is coupled between the first node and the fourth node;

integrate the difference current using an integrator, wherein the integrator is coupled at a first input to the fourth node, at a second input to the third node, and at an output to a fifth node; and

compare the difference current to a bias voltage using a comparator, wherein the comparator is coupled at a first input to the fifth node and at a second input to the third node, and wherein the bias voltage is provided to the current limiter at the third node.

11. The controller of claim 10 , wherein the integrator comprises:

a first capacitor coupled between the fourth node and the fifth node; and

an amplifier having a first input coupled to the fourth node, a second input coupled to the third node, and an output coupled to the fifth node.

12. The controller of claim 10 , wherein a second capacitor is coupled between the first node and the third node.

13. The controller of claim 10 , wherein the sensed current is a current flowing through a power transistor of the power converter.

14. The controller of claim 10 , further configured to control operation of the power converter based on a result of the comparison.

15. The controller of claim 10 , comprising a latch, wherein the latch is configured to control operation of the power converter based at least partially on a result of the comparison.

16. The controller of claim 10 , wherein dividing the reference current to form the divided reference current further comprises controlling a second switch based on a second phase of operation of the power converter, wherein the second switch is coupled between the first node the second resistor.