Datasheet

IA
CurrentCopy
OPA
R
GAIN
RG
1
RG
2
I
COPY
C
C
I
DRV
I
IA
IA
IN+
IA
IN-
Load
GND2
DRV
IA
OUT
V
IN
SET
I
MON
V-
DGND
V+XTR300
Digital
Control
OD
M2
M1
L
L
Error
Flags
EF
CM
EF
LD
EF
OT
InputSignal
R
SET
R
IMON
GND1
GND3
V =
OUT
R
2R
GAIN
SET
V
IN
V =
OUT
R
2
GAIN
V
R
IN
SET
V V
R
-
IN REF
OS
+
(
(
XTR300
www.ti.com SBOS336C –JUNE 2005– REVISED JUNE 2011
Figure 40. Simplified Voltage Output Mode Configuration
Applications not requiring the remote sense feature can use the OPA in stand-alone operation (M1 = high). In
this case, the IA is available as a separate input channel.
The IA gain can be set by two resistors, R
GAIN
and R
SET
:
(1)
or when adding an offset, V
REF
, to get bidirectional output with a single-ended input:
(2)
The R
SET
resistor is also used in current output mode. Therefore, it is useful to define R
SET
for the current mode,
then set the ratio between current and voltage span with R
GAIN
.
Copyright © 2005–2011, Texas Instruments Incorporated 19