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AM422 Fiches technique(PDF) 6 Page - Analog Microelectronics

No de pièce AM422
Description  VOLTAGE/CURRENT CONVERTER
Download  10 Pages
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Fabricant  AME [Analog Microelectronics]
Site Internet  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AM422 Fiches technique(HTML) 6 Page - Analog Microelectronics

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VOLTAGE/CURRENT CONVERTER
AM422
analog microelectronics
April 99
6/10
the input voltage VIN has to change to
∆∆
VV
R
RR
PIN
IN
4
2
12
=
+
(8)
With the value of the relationship of the resistors R1 and R2
R
R
VV
V
IN
PIN
PIN
1
2
4
4
=
∆∆
(9)
the additional offset current can be calculated as
II
I
I
V
R
R
RR
SET
OUTmin
INmin
OUTmin
INmin
=−
=−
+
2
0
2
12
(10)
The value of the set resistor can then be found using equation 4
In respect to the load resistor RL, the value of the supply voltage VS has to be considered with care.
The following relation is generally valid (see equation 1):
VI
R
V
S
OUTmax
L
CCmin
≥+
.
(11)
The resulting operating range is indicated in Figure 4. Sample calculations and typical values for the
external components are listed in the Application Notes (beginning page 8).
V
S [V]
R
L [Ω]
6
35
V
CCmin
= 6V
R
Lmax
= 500
I
OUTmax = 20mA
16
R
VV
I
L
SCCmin
OUTmax
24
12
500
Operating Area
0
300
0
Figure 4


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