发明名称 |
Direct current power supply device, power supply device for driving LED and semiconductor integrated circuit for controlling power supply |
摘要 |
Disclosed is a direct-current power supply device, including: an inductor; a switching element to intermittently supply a current to the inductor; an external terminal to which an output current of an external unit is fed back; a control circuit to generate a pulse signal having a pulse width corresponding to an output voltage of the external terminal, generate a drive signal for driving the switching element in response to the pulse signal, and output the drive signal to the switching element; a variable current source which is connected to the external terminal and which is turned on and off in response to a shutdown signal; and a discharge unit which is connected between the external terminal and a ground point and which is turned on in response to the shutdown signal so that the output current fed back to the external terminal is discharged into the ground point.
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申请公布号 |
US7977890(B2) |
申请公布日期 |
2011.07.12 |
申请号 |
US20090348963 |
申请日期 |
2009.01.06 |
申请人 |
MITSUMI ELECTRIC CO., LTD. |
发明人 |
KUMAGAI KEIZO |
分类号 |
H05B41/16;H01L33/00;H02M3/155 |
主分类号 |
H05B41/16 |
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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