Secondary side constant voltage and constant current controller
First Claim
1. An integrated circuit comprising:
- a first terminal;
a second terminal;
a third terminal;
a fourth terminal;
a first amplifier circuit that senses an overvoltage condition on the first terminal and in response causes a first current to flow through the fourth terminal; and
a second amplifier circuit that senses a voltage difference between a voltage on the second terminal and a voltage on the third terminal and causes a second current to flow through the fourth terminal if the voltage difference is above a predetermined voltage, wherein the first and second amplifier circuits are powered by a supply current received onto the integrated circuit through the first terminal.
2 Assignments
0 Petitions
Accused Products
Abstract
A low-cost integrated circuit is used as a secondary side constant voltage and constant current controller. The integrated circuit has four terminals and two amplifier circuits. A first amplifier circuit is used to sense a voltage on a FB terminal and in response to cause a first current to flow through an OPTO terminal. A second amplifier circuit is used to sense a voltage between a SENSE terminal and a SOURCE terminal and in response to cause a second current to flow through the same OPTO terminal. The FB terminal is used for output voltage feedback and is also used to supply power onto the integrated circuit. The SOURCE terminal is used for output current feedback and is also used as power supply return for the integrated circuit. The cost of the integrated circuit is reduced by having only four terminals.
-
Citations
20 Claims
-
1. An integrated circuit comprising:
-
a first terminal; a second terminal; a third terminal; a fourth terminal; a first amplifier circuit that senses an overvoltage condition on the first terminal and in response causes a first current to flow through the fourth terminal; and a second amplifier circuit that senses a voltage difference between a voltage on the second terminal and a voltage on the third terminal and causes a second current to flow through the fourth terminal if the voltage difference is above a predetermined voltage, wherein the first and second amplifier circuits are powered by a supply current received onto the integrated circuit through the first terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method, comprising:
-
using a first terminal on an integrated circuit package to sense a first voltage in a voltage control feedback loop, wherein the first voltage is sensed by a first error amplifier that is part of an integrated circuit that is packaged in the package; and using the first terminal to receive power onto the integrated circuit and to power the first error amplifier. - View Dependent Claims (10, 11, 12)
-
-
13. A power supply device having a first power supply terminal and a second power supply terminal, wherein an output voltage is present between the first and second power supply terminals, and wherein the power supply device supplies an output current through the first power supply terminal, the power supply device comprising:
-
a primary side controller; an optocoupler that provides a feedback signal to the primary side controller; and a secondary side constant voltage and constant current controller disposed in an integrated circuit package having no more than four terminals, wherein the secondary side controller is part of a voltage control feedback loop that provides feedback to the optocoupler to regulate the output voltage in a constant voltage (CV) mode, and wherein the secondary side controller is part of a current control feedback loop that provides feedback to the optocoupler to regulate the output current in constant current (CC) mode. - View Dependent Claims (14, 15, 16, 17)
-
-
18. A constant voltage (CV) and constant current (CC) controller integrated circuit, comprising:
-
a voltage control loop amplifier that causes a first current to flow through a first terminal if a voltage on a second terminal exceeds a first predetermined voltage in a constant voltage operating mode of the integrated circuit; a current control loop amplifier that causes a second current to flow through the first terminal if a voltage between a third terminal and a fourth terminal exceeds a second predetermined voltage in a constant current operating mode of the integrated circuit, wherein the first terminal, second terminal, third terminal and fourth terminals are terminals of the integrated circuit; and means for powering the voltage control loop amplifier and the current control loop amplifier by receiving a supply current through the second terminal. - View Dependent Claims (19, 20)
-
Specification