LT6100 datasheet(13/18 Pages) LINER

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LT6100

6100fd

For more information www.linear.com/LT6100

APPLICATIONS INFORMATION

Low Sense Voltage Operation

Figure 4 shows the simplest circuit configuration in which

the LT6100 may be used. While VOUT (output voltage)

increases with positive sense current, at VSENSE = 0V,

the LT6100’s buffered output can only swing as low as

VOL = 15mV. The accuracy at small sense voltages can be

improved by selecting higher gain. When gain of 50V/V

is selected, as shown in Figure 7, VOUT leaves the clipped

region for a positive VSENSE greater than 1mV compared

to 2.5mV for gain of 10V/V (see Figure 6).

OUTPUT

VEE

OUT

6100 F04

RSENSE

LT6100

VS–

VS+

VCC

0.1µF

FIL

TO LOAD

SENSE VOLTAGE (VS+ – VS–) (mV)

0.6

0.8

1.0

150

6100 F05

0.4

0.2

120

1.2

1.4

1.6

VS = 4.4V TO 48V

VCC = 3V

AV = 10V/V

TA = 25°C

Figure 4. LT6100 Load Current Monitor

Figure 5. Output Voltage vs VSENSE

SENSE VOLTAGE (VS+ – VS–) (mV)

0.15

0.20

0.25

6100 F06

0.10

0.05

0.30

0.35

0.40

VS = 4.4V TO 48V

VCC = 3V

AV = 10V/V

TA = 25°C

SENSE VOLTAGE (VS+ – VS–) (mV)

0.2

0.6

0.8

1.0

1.8

6100 F07

0.4

1.2

1.4

1.6

VS = 4.4V TO 48V

VCC = 3V

AV = 50V/V

TA = 25°C

Figure 6. Expanded View of Output Voltage vs VSENSE, AV = 10V/V

Figure 7. Expanded View of Output Voltage vs VSENSE, AV = 50V/V

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