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AM460 数据表(PDF) 8 Page - Analog Microelectronics

部件名 AM460
功能描述  Industrial Converter and Protector IC
Download  18 Pages
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制造商  AME [Analog Microelectronics]
网页  http://www.ame.com.tw/
标志 AME - Analog Microelectronics

AM460 数据表(HTML) 8 Page - Analog Microelectronics

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Industrial Converter and Protector IC
AM460
analog microelectronics
April 2003
8/18
reduce power dissipation the transistor is an external component and protected against reverse polarity by an
additional diode D1. Via pin SET an offset current ISET can be set at output IOUT (with the help of the inter-
nal voltage reference and an external voltage divider as shown in Figure 2, for example). External resistor R0
permits the output current to be finely adjusted with parallel operation of current and the voltage output. For
the output current provided by T1 the following ratio applies:
SET
INDAI
OUT
I
R
V
I
+
=
0
8
with
0
2R
V
I
SET
SET =
(3)
with VINDAI the voltage at INDAI and VSET the voltage at pin SET (V/I converter inputs, Figure 2)
2.
4. The AM460 reference voltage source enables voltage to be supplied to external components (such as sen-
sors, microprocessors, etc.). The reference voltage value VREF can be set via pin 13 VSET. If pin VSET is not
connected, VREF = 5V; if VSET is switched to ground, VREF = 10V. Values between these can be set if two
external resistors are used (inserted between pin VREF and pin VSET and between pin VSET and GND).
External (ceramic) capacitor C1 at pin VREF stabilises the reference voltage. It must be connected even if
the voltage reference is not in use.
5. The additional operational amplifier stage OP2 can be used as a current or voltage source to supply external
components. OP2's positive input is connected internally to voltage VBG so that the output current or output
voltage can be set across a wide range using one or two external resistors.
OPERATING AM460
General information on 2- and 3-wire applications and the use of the current output
In 3-wire operation (cf. Figure 3 right and Figure 7) the ground of the IC (pin GND) is connected up to the ex-
ternal mass of the system Ground. The system's supply voltage VS is connected to pin VCC and pin VCC to pin
RS+.
In 2-wire operation (cf. Figure 3 left and Figure 7) system supply voltage VS is connected to pin RS+ and pin
VCC to RS-. The ground of the IC (pin GND) is connected to the node between resistor R5 and load resistor RL
(current output IOUT). IC ground (GND) is not the same as system ground (Ground)!! The output signal is picked
up via load resistor RL which connects current output IOUT to the system ground.
2 The construction of the V/I converter is such that output current I
OUT is largely independent of the current amplification βF
of external transistor T1. Production-specific variations in the current amplification of the transistors used are compensated
for internally by the V/I converter.
R
L
V
S
2-wire system
signal source and
conditioning IC
GND
Ground
V
CC ≠ VS
Ground
R
L
3-wire system
signal source and
conditioning IC
GND
Ground
=
V
CC = VS
Ground
GND
=
GND
V
CC
I
OUT
I
OUT
VV
CC
S
=
Figure 3: Difference between 2- and 3-wire operation


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