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STLD20D Arkusz danych(PDF) 22 Page - STMicroelectronics

Numer części STLD20D
Szczegółowy opis  White LED power supply
PDF  31 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLD20D Arkusz danych(HTML) 22 Page - STMicroelectronics

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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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