Control circuit for monitoring and maintaining a bootstrap voltage in an N-channel buck regulator
US7145316B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 2005 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Jun 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit is incorporated in a switching regulator for monitoring and maintaining a bootstrap voltage to allow the switching regulator to operate at or near 100% duty cycle. The control circuit includes a circuit receiving the bootstrap voltage and generating a monitor voltage, a comparator circuit receiving the monitor voltage and a first voltage indicative of a switching output voltage and generating an output signal having a first state when the monitor voltage is equal to or less than the first voltage, a logic circuit receiving the output signal and generating drive control signals to driver circuits driving the high-side and low-side power switches. The logic circuit generates the drive control signals in response to the output signal of the comparator circuit having the first state to cause the high-side power switch to turn off and the low-side power switch to turn on, thereby recharging the bootstrap voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.