Soft start sequencer for starting multiple voltage regulators
First Claim
1. A soft start sequencer for starting a plurality of voltage regulators, the soft start sequencer comprising a first clock for clocking a plurality of soft start circuits, wherein each soft start circuit is for ramping a reference signal from a first value to a second value over a ramp time after a delay time, each soft start circuit comprising:
- a divider operable to divide the first clock by an integer N to generate a second clock;
a first counter clocked by the first clock, the first counter operable to time the delay time; and
a second counter clocked by the second clock, the second counter operable to time the ramp time after the delay time.
8 Assignments
0 Petitions
Accused Products
Abstract
A soft start sequencer is disclosed for starting a plurality of voltage regulators, the soft start sequencer comprising a first clock for clocking a plurality of soft start circuits, wherein each soft start circuit for ramping a reference signal from a first value to a second value over a ramp time after a delay time. Each soft start circuit comprises a divider operable to divide the first clock by an integer N to generate a second clock, a first counter clocked by the first clock, the first counter operable to time the delay time, and a second counter clocked by the second clock, the second counter operable to time the ramp time after the delay time.
131 Citations
19 Claims
-
1. A soft start sequencer for starting a plurality of voltage regulators, the soft start sequencer comprising a first clock for clocking a plurality of soft start circuits, wherein each soft start circuit is for ramping a reference signal from a first value to a second value over a ramp time after a delay time, each soft start circuit comprising:
-
a divider operable to divide the first clock by an integer N to generate a second clock; a first counter clocked by the first clock, the first counter operable to time the delay time; and a second counter clocked by the second clock, the second counter operable to time the ramp time after the delay time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of starting a plurality of voltage regulators, the method comprising:
-
clocking a plurality of soft start circuits with a first clock, each soft start circuit ramping a reference signal from a first value to a second value over a ramp time after a delay time; dividing the first clock by an integer N to generate a second clock; clocking a first counter with the first clock, the first counter operable to time the delay time; and clocking a second counter with the second clock, the second counter operable to time the ramp time after the delay time. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A data storage device comprising:
-
a storage medium; and control circuitry operable to write data to the storage medium and read data from the storage medium, the control circuitry comprising a plurality of voltage regulators and a soft start sequencer for starting the plurality of voltage regulators, the soft start sequencer comprising a first clock for clocking a plurality of soft start circuits, wherein each soft start circuit is for ramping a reference signal from a first value to a second value over a ramp time after a delay time, each soft start circuit comprising; a divider operable to divide the first clock by an integer N to generate a second clock; a first counter clocked by the first clock, the first counter operable to time the delay time; and a second counter clocked by the second clock, the second counter operable to time the ramp time after the delay time. - View Dependent Claims (18, 19)
-
Specification