发明名称 |
LED driver circuit |
摘要 |
A semiconductor chip includes an LED driver circuit operably coupled to at least one LED and configured to supply a load current to the at least one LED such that an average load current matches a desired current level defined by a drive signal. A temperature measurement circuit is thermally coupled to the LED driver circuit or the LED(s) or both, and is configured to generate, as drive signal, a temperature dependent signal in such a manner that the drive signal is approximately at a higher constant level for temperatures below a first temperature, is approximately at a lower constant level for temperatures above a second temperature but below a maximum temperature, and continuously drops from the higher constant level to the lower constant level for temperatures rising from the first temperature to the second temperature. |
申请公布号 |
US8946995(B2) |
申请公布日期 |
2015.02.03 |
申请号 |
US201313748409 |
申请日期 |
2013.01.23 |
申请人 |
Infineon Technologies Austria AG |
发明人 |
Pflaum Bernd |
分类号 |
H05B37/00;H05B41/00;H01H71/00;H05B37/02 |
主分类号 |
H05B37/00 |
代理机构 |
Slater & Matsil, L.L.P. |
代理人 |
Slater & Matsil, L.L.P. |
主权项 |
1. A semiconductor chip including integrated circuitry, the semiconductor chip comprising:
an LED driver circuit configured to be coupled to an LED to supply a load current to the LED such that an average load current matches a desired current level defined by a drive signal; and a temperature measurement circuit configured to be thermally coupled to the LED driver circuit or the LED or both to generate, as a drive signal, a temperature dependent signal in such a manner that the drive signal is approximately at a higher constant level for temperatures below a first temperature, is approximately at a lower constant level for temperatures above a second temperature but below a maximum temperature, and continuously drops from the higher constant level to the lower constant level for temperatures rising from the first temperature to the second temperature. |
地址 |
Villach AT |