发明名称 |
Current drive circuit for light emitting diode |
摘要 |
A pulse width modulated dimming pulse signal PWM is input to a control input terminal P5. A standby terminal P6 receives a standby signal STB that indicates switching between a standby state and an operating state of a current drive circuit 8. A burst dimming terminal BS is provided to each of eight respective channels. Each burst dimming terminal BS receives a voltage at one terminal (cathode) of a corresponding LED string 6. When the voltage level of the standby signal STB is included in a first voltage range, a burst controller 9 is set to an all channel common mode, and when it is included in a second voltage range, the mode is set to a phase shift mode phiSHIFT. The burst controller 9 set to the phase shift mode phiSHIFT automatically sets the phase shift angle according to the number of connected LED strings 6.
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申请公布号 |
US8492982(B2) |
申请公布日期 |
2013.07.23 |
申请号 |
US201113090357 |
申请日期 |
2011.04.20 |
申请人 |
HAGINO JUNICHI;HARUTA SHINGO;ROHM CO., LTD. |
发明人 |
HAGINO JUNICHI;HARUTA SHINGO |
分类号 |
H05B37/02 |
主分类号 |
H05B37/02 |
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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