LED buck regulator control IC
US7301288B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2005 |
| Grant date | Nov 27, 2007 |
| Priority date | — |
| Expiry date | Feb 23, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high speed buck control IC for constant LED current regulation. A continuous mode hysteretically controlled buck regulator monitors the load current using an accurate on-chip band-gap voltage reference. This style of current regulation allows the designer to dispense with large and sometimes bulky output capacitors. The IC is inherently protected against short circuit conditions, and an additional circuit provides open circuit protection. An external high side bootstrap circuit aids in driving the buck switching element especially at high frequencies. A low side driver is also provided for use, e.g. in synchronous rectifier designs. All functions are realized within a small 8 pin DIP or SOIC package.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.