LTC6103CMS8 datasheet(9/16 Pages) LINER

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LTC6103

6103f

APPLICATIONS INFORMATION

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 RIN values. Trace resistance

to the –IN terminals will increase the effective RIN value,

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 0.3

Ω to RIN.

Selection of External Output Resistor, ROUT

The output resistor, ROUT, determines how the output cur-

rent is converted to voltage. VOUT is simply IOUT • ROUT. In

choosing an output resistor, the maximum output voltage

must ﬁrst be considered. If the circuit following is a buf-

fer or ADC with limited input range, then ROUT must be

chosen so that IOUT(MAX) • ROUT is less than the allowed

maximum input range of this circuit.

In addition, the output impedance is determined by ROUT. If

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 ROUT value may be required in order to

preserve the accuracy of the output. As an example, if the

input impedance of the driven circuit is 100 times ROUT,

then the accuracy of VOUT will be reduced by 1% since:

OUT

IN DRIVEN

OUT

IN DRIVEN

•

()

IIR

OUT

••

•

100

101

099

Figure 3b. The LTC6103 Allows High-Low Current Ranging

6103 F03b

301

Ω

VOUT

VIN

RSENSE(LO)

100m

Ω

Si4465

7.5k

ILOAD

10k

CMPZ4697

301

Ω

1.74M

4.7k

CMPT5551

619k

40.2k

LTC1540

VLOGIC

(3.3V TO 5V)

7.5k

VLOGIC

BAT54C

HIGH CURRENT

RANGE OUT

250mV/A

HIGH

RANGE

INDICATOR

(ILOAD > 1.2A)

LOW CURRENT

RANGE OUT

250mV/A

RSENSE(HI)

10m

Ω

–

(VLOGIC + 5V) ≤ VIN ≤ 60V

≤ ILOAD ≤ 10A

LTC6103

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