发明名称 |
Control circuit for switching power supply |
摘要 |
A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string to be intermittently driven. In the on period of the LED string, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a detection voltage VLED that corresponds to the output voltage Vout of the switching power supply matches a predetermined reference voltage Vref. A driver drives a switching transistor included in the switching power supply according to the pulse signal. After transition from the on period to the off period, the pulse modulator reduces the duty ratio of the pulse signal over time. |
申请公布号 |
US8624828(B2) |
申请公布日期 |
2014.01.07 |
申请号 |
US201113090605 |
申请日期 |
2011.04.20 |
申请人 |
UCHIMOTO DAISUKE;KIKUCHI HIROKI;ROHM CO., LTD. |
发明人 |
UCHIMOTO DAISUKE;KIKUCHI HIROKI |
分类号 |
G09G3/36 |
主分类号 |
G09G3/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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