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LTC6104

6104f

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

TYPICAL APPLICATION

H-Bridge Load Current Monitor

6104 TA02

VBATTERY

(8V TO 60V)

3V TO 18V

PWM*

249

Ω

4.99k

µF

10m

LT1790-2.5

PWM*

VO = 2.5V ±2V (±10A FS)

*USE “SIGN-MAGNITUDE” PWM FOR ACCURATE

LOAD CURRENT CONTROL AND MEASUREMENT

249

Ω

0.1

µF

LTC6104

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.

Figure 8

VOUT

ROUT

LTC6104

RINB

RINA

RSHUNTA

CURRENT

MIRROR

LOAD

BATTERY

6104 F08

VREF

RSHUNTB

CHARGER

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