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AS3834 датащи(PDF) 11 Page - ams AG

номер детали AS3834
подробное описание детали  4 channel high-precision LED cont rol ler for 3D-LCD backl ight wi th
PDF  21 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS3834 датащи(HTML) 11 Page - ams AG

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Revision 1.6
10 - 20
AS3834
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
8.1 Precision current output
Figure 9. Current output stage
The LED-current is derived from either Rset using the following equation
Iset is protected against a short to ground. In the case of a ground short the current Iset is limited to 660uA and the LED-current to 330mA.
Iset has a lower limit of 6uA with a 1uA hysteresis.This sets the lower limit of the LED-current to 3mA with Rset=200kΩ. If Rset is large than
200k
Ω, the LED-current is set to 0mA.
I
LED
RATIO
I
se t
×
=
RATIO
V
s et
R
s et
---------
×
500
1.2V
R
SET
------------
×
=
=
(EQ 1)



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