LTC6103 Linear Integrated Systems, LTC6103 Datasheet - Page 13

• Manufacturer Part Number: LTC6103
• Description: High Side Current Sense Amplifier
• Manufacturer: Linear Integrated Systems

Voltage Translator
Each amplifi er of the LTC6103 can be used as a high volt-
age level translator circuit as shown in Figure 7. In this
application, the LTC6103 translates a differential voltage
signal riding on top of a high common mode voltage. V
signals get converted to a current, through R
scaled down to a ground referenced voltage across R
Since the V
input voltage is 70V, this circuit can translate differential
signals with up to 66V of variation in V
With the dual LTC6103, half of the device can be used
to monitor a high side referenced signal and the other
amplifi er can be used for current sensing.
Output Connection Methods
The outputs of the LTC6103 are current sources and may
be connected to subsequent circuitry in several ways.
As a dual current sense part, each output can be used
independently and in differing ways if desired.
For applications where the destination is local to the
device, R
form voltage sources. It is also possible to remotely locate
APPLICATIONS INFORMATION
OUT
SUPPLY
resistors may be co-located with the part to
must be at least 4V and the maximum
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TRANSLATE
Figure 7. Operation as Voltage Translator
V
TRANSLATE
IN
, and then
.
LTC6103
OUT
1/2
IN
.
V
S
–
+ –
V
the R
voltage drop is developed against a different ground refer-
ence point than the LTC6103 V
another assembly. This method provides the elimination
of ground drop errors from effecting the measurement.
Ground differentials that are small enough to prevent
conduction of the output protection zener (>8V positive
or a couple hundred mV negative) can be rejected without
affecting linearity.
In the Typical Application, “±10A Differential Output Bidi-
rectional Monitor,” the outputs are kept separate, but are
treated as a differential pair. This connection allows placing
R
errors are rejected a the destination circuit as common
mode voltage shift, not signal error. This connection is
also shown in the application, ±10A Bidirectional H-Bridge
Monitor.
The outputs can also be tied together to drive a single
R
Bidirectional Monitor, producing an additive function. In
that particular circuit the two inputs are wired oppositely
form the same sense resistor, so the resulting output is
an absolute value signal.
IN
OUT
OUT
+
R
R
6103 F07
OUT
OUT
IN
resistors local to the LTC6103, and yet ground drop
as in the Typical Application, 5A Absolute Value
resistors so that the current generated output
V
OUT
–
, such as at an ADC within
LTC6103
13
6103f