LTC6104 LINER [Linear Technology], LTC6104 Datasheet - Page 14

• Manufacturer Part Number: LTC6104
• Description: High Voltage, High Side, Bi-Directional Current Sense Amplifi er
• Manufacturer: LINER [Linear Technology]

LTC6104
APPLICATIONS INFORMATION
decrease the response time, since V
Reducing R
effect of increasing the voltage gain of the circuit.
Use of Dual Sense Resistors
The dual amplifi er topology offers signifi cant advantages
for controlling gain, dynamic range and shunt current.
As an example, separate shunt resistors can be advanta-
geous for an H-bridge current monitor (see H-Bridge Load
Current Monitor application). It can also be a signifi cant
advantage for battery-operated systems, where battery
discharge and charge current can be signifi cantly differ-
ent. With different current range requirements, a “charge
shunt resistor” can be connected from the charger to the
battery and a separate “discharge shunt resistor” can be
connected from the battery to the load. Other applications
can benefi t from similar topologies where different shunt
resistors enable the user to trade off accuracy and shunt
power consumption. Finally, since each amplifi er has an
independent input resistor, gain for each channel can be
set to suit the application. The only limitation to observe
in this type of application is that since the power for both
TYPICAL APPLICATION
14
IN
and increasing R
PWM*
OUT
10m
OUT
will both have the
*USE “SIGN-MAGNITUDE” PWM FOR ACCURATE
LOAD CURRENT CONTROL AND MEASUREMENT
= I
249Ω
OUT
H-Bridge Load Current Monitor
8
(8V TO 60V)
7
V
LTC6104
BATTERY
• R
4
I
M
OUT
6
5
2
.
249Ω
6104 TA02
sense amplifi ers is furnished via the +INB pin, the input
protection for both sections is referenced to this one pin.
Normal operation of section A is maintained for +INA
and –INA voltages within the range of 0.5V above +INB
to 1.5V below +INB. As long as both sense resistors are
connected to a common potential and voltage drops are
small (like <500mV, for example), as in Figure 8 or the
H-bridge application, this condition will be met.
10m
3V TO 18V
V
OUT
1
4
LT1790-2.5
R
CHARGER
OUT
PWM*
2
LOAD
V
REF
V
O
= 2.5V ±2V (±10A FS)
6
LTC6104
0.1µF
4.99k
1µF
R
V
A
O
SHUNTA
Figure 8
CURRENT
MIRROR
R
R
INA
INB
R
SHUNTB
B
V
S
6104 F08
BATTERY
6104f