LTC6103 Linear Integrated Systems, LTC6103 Datasheet - Page 9

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

Care should be taken when designing the printed circuit
board layout to minimize input trace resistance (to Pins 5,
6, 7 and 8), especially for small R
to the –IN terminals will increase the effective R
causing a gain error. Trace resistance on +IN terminals will
have an effect on offset error. These errors are described
in more detail later in this data sheet. In addition, internal
device resistance will add approximately 0.3Ω to R
Selection of External Output Resistor, R
The output resistor, R
rent is converted to voltage. V
choosing an output resistor, the maximum output voltage
must fi rst be considered. If the circuit following is a buf-
fer or ADC with limited input range, then R
chosen so that I
maximum input range of this circuit.
APPLICATIONS INFORMATION
V
OUT
OUT(MAX)
I
LOAD
OUT
CMPZ4697
, determines how the output cur-
• R
10k
R
SENSE(LO)
100mΩ
OUT
OUT
IN
is less than the allowed
is simply I
Figure 3b. The LTC6103 Allows High-Low Current Ranging
values. Trace resistance
www.DataSheet4U.com
M1
Si4465
8
1
R5
7.5k
7
2
301Ω
LTC6103
OUT
4
OUT
(V
0A ≤ I
6
OUT
301Ω
LOGIC
LOAD
• R
R
IN
must be
SENSE(HI)
+ 5V) ≤ V
5
10mΩ
OUT
≤ 10A
value,
IN
.
. In
IN
7.5k
V
≤ 60V
IN
In addition, the output impedance is determined by R
the circuit to be driven has high enough input impedance,
then almost any useful output impedance will be accept-
able. However, if the driven circuit has relatively low input
impedance or draws spikes of current, as an ADC might
do, then a lower R
preserve the accuracy of the output. As an example, if the
input impedance of the driven circuit is 100 times R
then the accuracy of V
V
BAT54C
OUT
V
1.74M
619k
LOGIC
40.2k
=
=
6103 F03b
I I
I
OUT
OUT
3
4
5
6
HIGH CURRENT
RANGE OUT
250mV/A
LOW CURRENT
RANGE OUT
250mV/A
(3.3V TO 5V)
•
•
+
–
V LOGIC
R
R
R
2
OUT
OUT
OUT
OUT
7
LTC1540
1
OUT
value may be required in order to
•
+
•
(I
100
101
R
R
INDICATOR
LOAD
8
IN DRIVEN
RANGE
will be reduced by 1% since:
IN DRIVEN
HIGH
(
(
> 1.2A)
=
0 99
.
4.7k
)
Q1
CMPT5551
)
•
I
OUT
LTC6103
•
R
OUT
OUT
OUT
9
6103f
. If
,