Industrial V/I Converter and Protector IC
AM462
BOUNDARY CONDITIONS
Parameter
Symbol
Conditions
OUTFS = 20mA
c = 20mA/IOUTFS
OUTFS = 20mA
Min.
Typ.
Max.
Unit
Sense Resistor
R0
I
17
c ⋅ 17
35
27
c ⋅ 27
40
38
c ⋅ 38
45
R
R
Stabilization Resistor
I
R
c = 20mA/IOUTFS
c ⋅ 35
0
20
20
1.9
90
c ⋅ 40
c ⋅ 45
600
200
200
5.0
Load Resistance
RL
Limitation only for 3-wire operation
Sum Gain Resistors
Sum Offset Resistors
R1 + R2
R3 + R4
C1
k
k
V
REF Capacitance
Ceramic
2.2
100
50
µF
nF
V
Output Capacitance
D1 Breakdown Voltage
T1 Forward Current Gain
C2
VBR
F
Only for 2-wire operation
250
35
50
BCX54/55/56, for example
150
DETAILED DESCRIPTION OF FUNCTIONS
AM462 is a modular, universal V/I converter and protector IC which has been specially developed
for the conditioning of voltage signals referenced to ground. It is designed for both 2- and 3-wire
operation in industrial applications (cf. application in Figure 8). AM462’s various functions are
depicted in the block diagram (Figure 2) which also illustrates how few external components are
required for the operation of this particular device.
AM462 consists of several modular function blocks (operational amplifiers, voltage-to-current
converters and references) which, depending on external configurations, can either be switched to
one another or operated separately (see the basic circuitry in Figure 2):
1. Operational amplifier stage OP1 enables a positive voltage signal to be amplified. OP1 gain
GGAIN can be set via external resistors R1 and R2. Protective circuitry against overvoltage is
integrated into the chip, limiting the voltage to the set value of the reference voltage. Output
voltage VOUTAD at pin OUTAD is calculated as:
R1
R2
VOUTAD = VINP ⋅GGAIN with GGAIN =1+
(1)
where VINP is the voltage at OP1’s input pin INP.
2. The internal voltage-to-current converter (V/I converter) provides a voltage-controlled current
signal at IC output IOUT (pin 8) which activates an external transistor T1; this in turn supplies
the actual output current IOUT. To 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 internal 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:
analog microelectronics
December2006
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone: +49 (0)6131/91 073 - 0
Fax: +49 (0)6131/91 073 – 30
Email: info@analogmicro.de
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Rev. 2.4
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