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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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STLD20D 数据表(PDF) 22 Page - STMicroelectronics |
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STLD20D 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 31 page  Analog dimming control STLD20D 22/31 Where: ● VFB is the feedback voltage ● ILED is the LED current for full brightness Note: If Vdim is equal to 0 the LED current can be higher the programmed value. 9.3 Rdim calculation for dimming mode control Rdim and Rd1 are dimensioned to get a current in the dimming circuit much smaller than the LED current. From the formula 19, Rdim can be calculated by: Where: ● Vdimmax is the maximum dimming voltage ● ILEDmin is the expected minimum dimming current R dim R d1 R LED + [] V FB V dim max – – [] ⋅ I LEDmin RLED V FB – ------------------------------------------------------------------------------------------- 22 [] = |
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