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AN2129 Folha de dados(PDF) 5 Page - STMicroelectronics

Nome de Peças AN2129
Descrição Electrónicos  DIMMING OF SUPER HIGH BRIGHTNESS LEDS
PDF  9 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2129 Folha de dados(HTML) 5 Page - STMicroelectronics

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AN2129 APPLICATION NOTE
Figure 7. Dimming network with zero dimming voltage (maximum current)
Eq 1
The second limit state is depicted in Figure 8. In this case the current through the Rsense is
zero (LED is off) and thus on point A there is a zero voltage (i.e. ground). The Equation 2
shows the calculation for this state.
Figure 8. Dimming network with maximum dimming voltage (zero output current)
Eq 2
Vdimm = 0V
100mV
R5 R6 I
LED Rsense
⋅⋅
⋅
R4 R5
⋅
R4 R6
⋅
R5 R6
⋅
++
---------------------------------------------------------------------------
=
Vdimm = 3.3V
100mV
V
dimMAX
R4 R5
⋅
R4 R5
⋅
R4 R6
⋅
R5 R6
⋅
++
---------------------------------------------------------------------------
=



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