发明名称 |
Drive circuit to adjust a luminance of a light emitting element based on a PWM signal, and a portable information terminal including the drive circuit |
摘要 |
A drive circuit (100) includes an operational amplifier (OP1) that compares a voltage applied to an inverting input terminal with a reference voltage applied to a non-inverting input terminal, a MOS transistor (M1) that has an output connected to the inverting input terminal of the operational amplifier (OP1) and supplies a current to a load (3) depending on a comparison result of the operational amplifier (OP1), and a switch (SW1) that switches, based on a control signal, between outputting the comparison result of the operational amplifier (OP1) to the MOS transistor (M1) and outputting a predetermined voltage to the MOS transistor (M1) to turn off the MOS transistor (M1). |
申请公布号 |
US8253343(B2) |
申请公布日期 |
2012.08.28 |
申请号 |
US20100899990 |
申请日期 |
2010.10.07 |
申请人 |
CHIDA TAISUKE;ROHM CO., LTD. |
发明人 |
CHIDA TAISUKE |
分类号 |
G09G3/20;H05B39/00;G09G3/34;H01L33/00;H03K17/78 |
主分类号 |
G09G3/20 |
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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