LTC6103H 查看數據表（PDF） - Linear Technology

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LTC6103H

Dual High Voltage, High Side Current Sense Amplifi er

Linear Technology 

LTC6103

APPLICATIONS INFORMATION

CMPZ4697

ILOAD

VOUT

10k

M1

Si4465

RSENSE(LO)

100mΩ

RSENSE(HI)

10mΩ

VIN

301Ω 301Ω

87

6

5

LTC6103

12 4

7.5k

R5

7.5k

(VLOGIC + 5V) ≤ VIN ≤ 60V

0A ≤ ILOAD ≤ 10A

VLOGIC

(3.3V TO 5V)

3+

4–

5

40.2k 6

7

LTC1540

8

Q1

CMPT5551

4.7k

1.74M

619k

BAT54C

HIGH

2 1 RANGE

INDICATOR

(ILOAD > 1.2A)

HIGH CURRENT

RANGE OUT

250mV/A

VLOGIC

LOW CURRENT

RANGE OUT

6103 F03b 250mV/A

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

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 0.3Ω 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:

VOUT

=

IOUT

•

ROUT

ROUT

• RIN(DRIVEN)

+ RIN(DRIVEN)

=

IOUT

• ROUT

•

100

101

=

0.99

• IOUT

• ROUT

6103f

9

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