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AM462 датащи(PDF) 9 Page - Analog Microelectronics

номер детали AM462
подробное описание детали  Industrial V/I Converter and Protector IC
PDF  20 Pages
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производитель  AME [Analog Microelectronics]
домашняя страница  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AM462 датащи(HTML) 9 Page - Analog Microelectronics

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Industrial V/I Converter and Protector IC
AM462
analog microelectronics
December2006
Analog Microelectronics GmbH
Phone: +49 (0)6131/91 073 - 0
9/20
An der Fahrt 13, D – 55124 Mainz
Fax:
+49 (0)6131/91 073 – 30
Rev. 2.4
Internet: http://www.analogmicro.de
Email:
info@analogmicro.de
()
4
3
4
0
2
0
R
R
R
R
V
I
V
I
REF
SET
INDAI
OUT
+
⋅
=
=
=
(3)
and thus for the ratio of the resistors R3/R4:
1
2
0
4
3
−
=
SET
REF
I
R
V
R
R
(4)
The output current range is set in conjunction with the selected external resistors R1 and R2 (or fine
adjustment with R0 ). Using Equations 1 and 2 the following is calculated for output current IOUT :
SET
GAIN
INP
OUT
I
R
G
V
I
+
=
0
8
with
2
1
1
R
R
G
GAIN
+
=
(5)
Selecting the supply voltage
System supply voltage VS needed to operate AM462 is dependent on the selected mode of
operation.
When using current output pin IOUT (in conjunction with the external transistor) the value of VS is
dependent on that of the relevant load resistor RL (max. 600Ω) used by the application. The
minimum system supply voltage VS is then:
min
max
CC
L
OUT
S
V
R
I
V
+
≥
(6)
Here, IOUTmax stands for the maximum output current and VCCmin for the minimum IC supply voltage
which is dependent on the selected reference voltage:
V
1
min
+
≥
REF
CC
V
V
(7)
VS [V]
RL [Ω]
6
35
VCCmin = 6V
RLmax = 600Ω
IOUTmax = 20mA
18
24
12
600
Working range
0
300
0
R
VV
I
L
SCCmin
OUTmax
−
Figure 4: Working range in conjunction with the load resistor



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