Guaranteed bootstrap hold-up circuit for buck high side switch
US7026801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2003 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Feb 20, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/901
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A buck regulator switching power supply (10) selectively enabling a low side device to effectively recharge a bootstrap capacitor (Cboot) during a high duty cycle of operation. The switching power supply (10) includes a gate driver (12) driving a gate of a high side FET (Q1) responsive to a controller circuit (14). Controller circuit (14) includes a controller (16) responsively controlled by a comparator (18). Comparator (18) senses the charge of the charging side of the bootstrap capacitor (Cboot) as compared to a voltage (Vref). The comparator (18) also responsively generates an output signal on an output line (20) as a function of the voltage at the phased output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.