Offline converter with integrated softstart and frequency jitter
DC CAFCFirst Claim
1. A pulse width modulated switch comprising:
- a first terminal;
a second terminal;
a switch comprising a control input, said switch allowing a signal to be transmitted between said first terminal and said second terminal according to a drive signal provided at said control input;
a frequency variation circuit that provides a frequency variation signal;
an oscillator that provides an oscillation signal having a frequency range, said frequency of said oscillation signal varying within said frequency range according to said frequency variation signal, said oscillator further providing a maximum duty cycle signal comprising a first state and a second state; and
a drive circuit that provides said drive signal when said maximum duty cycle signal is in said first state and a magnitude of said oscillation signal is below a variable threshold level.
1 Assignment
Litigations
2 Petitions
Reexaminations
Accused Products
Abstract
A pulse width modulated switch comprises a first terminal, a second terminal, and a switch that allows a signal to be transmitted between the first terminal and the second terminal according to a drive signal provided at a control input. The pulse width modulated switch also comprises a frequency variation circuit that provides a frequency variation signal and an oscillator that provides an oscillation signal having a frequency of that varies within a frequency range according to the frequency variation signal. The oscillator further provides a maximum duty cycle signal comprising a first state and a second state. The pulse width modulated switch further comprises a drive circuit that provides the drive signal when the maximum duty cycle signal is in the first state and a magnitude of the oscillation signal is below a variable threshold level.
-
Citations
18 Claims
-
1. A pulse width modulated switch comprising:
-
a first terminal; a second terminal; a switch comprising a control input, said switch allowing a signal to be transmitted between said first terminal and said second terminal according to a drive signal provided at said control input; a frequency variation circuit that provides a frequency variation signal; an oscillator that provides an oscillation signal having a frequency range, said frequency of said oscillation signal varying within said frequency range according to said frequency variation signal, said oscillator further providing a maximum duty cycle signal comprising a first state and a second state; and a drive circuit that provides said drive signal when said maximum duty cycle signal is in said first state and a magnitude of said oscillation signal is below a variable threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A regulation circuit comprising:
-
a first terminal; a second terminal; a feedback terminal coupled to disable the regulation circuit; a switch comprising a control input, said switch allowing a signal to be transmitted between said first terminal and said second terminal according to a drive signal provided at said control input; a frequency variation circuit that provides a frequency variation signal; an oscillator that provides an oscillation signal having a frequency range, said frequency of said oscillation signal varying within said frequency range according to said frequency variation signal, said oscillator further providing a maximum duty cycle signal comprising a first state and a second state; and a drive circuit that provides said drive signal when said maximum duty cycle signal is in said first state and said regulation circuit is not disabled. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
Specification