LTC6104I View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC6104I Datasheet PDF : 16 Pages
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LTC6104
APPLICATIONS INFORMATION
decrease the response time, since VOUT = IOUT • ROUT.
Reducing RIN and increasing ROUT will both have the
effect of increasing the voltage gain of the circuit.
Use of Dual Sense Resistors
The dual amplifier topology offers significant 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 significant
advantage for battery-operated systems, where battery
discharge and charge current can be significantly 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 benefit from similar topologies where different shunt
resistors enable the user to trade off accuracy and shunt
power consumption. Finally, since each amplifier 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
sense amplifiers 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.
CHARGER
LOAD
RSHUNTB
RINB
RSHUNTA RINA
BATTERY
A
VOUT
ROUT
VREF
LTC6104
CURRENT
MIRROR
Figure 8
B
VS
6104 F08
TYPICAL APPLICATION
H-Bridge Load Current Monitor
3V TO 18V
0.1µF
VBATTERY
(8V TO 60V)
4
1µF
6
LT1790-2.5
10m 249Ω 7
6 249Ω
12
10m
4.99k
8
5
LTC6104
2
4
VO
VO = 2.5V ±2V (±10A FS)
14
PWM*
PWM*
IM
6104 TA02
*USE “SIGN-MAGNITUDE” PWM FOR ACCURATE
LOAD CURRENT CONTROL AND MEASUREMENT
6104f
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