75 lines
1.4 KiB
Plaintext
75 lines
1.4 KiB
Plaintext
LEDs data
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=========
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Specifications
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--------------
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From data sheet
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Luminosity Vf
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Pink 75 mcd @ 5 mA 2.8V @ 5 mA
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Blue 120 mcd @ 10 mA 3.0V @ 10 mA
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Emerald 600 mcd @ 20 mA 3.0V @ 20 mA
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Measured driven by UP5k
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-----------------------
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At several currents of the SB_RGBA_DRV :
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Cathode Voltage
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Anode Voltage [ Voltage across LED ]
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-> estimated real current
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2 mA 4 mA 6 mA 8 mA 10 mA 12 mA
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Pink:
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0.420 V 0.277 V 0.189 V 0.141 V 0.112 V 0.094 V
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3.242 V [ +2.826 V ] 3.205 V [ +2.934 V ] 3.178 V [ +2.994 V ] 3.161 V [ +3.026 V ] 3.151 V [ +3.044 V ] 3.144 V [ +3.055V ]
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~ 2.3 mA ~ 4.5 mA ~ 5.6 mA ~ 6.5 mA ~ 7.2 mA
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Blue
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0.582 V 0.483 V 0.385 V 0.302 V 0.235 V 0.190 V
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3.242 V [ +2.644 V ] 3.202 V [ +2.723 V ] 3.163 V [ +2.783 V ] 3.128 V [ +2.830 V ] 3.096 V [ +2.865 V ] 3.075 V [ +2.889 V ]
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Emerald
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0.799 V 0.626 V 0.491 V 0.373 V 0.282 V 0.214 V
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3.241 V [ +2.443 V ] 3.201 V [ +2.579 V ] 3.162 V [ +2.676 V ] 3.124 V [ + 2.753 V ] 3.090 V [ +2.813 V] 3.063 V [ +2.856 V ]
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~ 2.2 mA ~ 4.4 mA
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Selected currents
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-----------------
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* Run pink led at 6 mA
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About the max current that's still a bit regulated
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Brightness ~ 88.5 mcd
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* Blue led would need 7.375 mA to match brightness
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-> Run blue led at 8 mA
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Brightness ~ 96 mcd
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Apply scale factor 236 >> 8
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* Green led would need 3 mA to match brightness
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-> Run green led at 4 mA
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Brightness ~ 120 mcd
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Apply scale factor 189 >> 8
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