Linear Technology LT6107 Manuale utente

LT6107

DESCRIPTION

Demonstration circuit 1363 is a General Purpose High-

Side Current-Sense Amplifier featuring the LT61 7.

This demo board amplifies an on-board current-sense

resistor voltage-drop, providing a precision uni-polar

output voltage proportional to load current. The demo

circuit includes scaling resistors that program the gain of

the circuit to 5 V/V. The LT61 7 is pow ered from the

same supply that the sense resistor is connected to and

provides a ground referenced output. The LT61 7 can

perform current measurements on supplies ranging from

2.7V to 36V. Since the output voltage is developed as a

controlled current through a load resistance, ground-

loop errors can be eliminated by simply locating the load

resistor at the destination point (subsequent signal

processing such as A/D conversion). Remote loading can

be evaluated by simply removing the on board load

resistor (R3).

DC1363 is fabricated from FR-4 6 high-temp epoxy-

glass so that the full 15 ° operation of the LT61 7 can

be demonstrated. Other key performance characteristics

of the LT61 7 and DC1363 are show n in the

Performance Summary below .

Design files for this circuit board are available. Call

the LTC factory.

, LT are registered trademarks of Linear Technology Corporation. Other product names

may be trademarks of the companies that manufacture the products.

PERF ORM ANCE SU M M ARY

Specifications are at T

= 25°C

SY BOL PARA ETER CONDITIONS IN TYP AX UNITS

M onitored Supply Input Range

2.7 3… 28 36

M O N

M easurement Output Signal I

OUT

= 5A

2.5

M ON

M easurement Output Signal (current mode) I

OUT

= 5A, R3 removed

µA

OUT

Output Load Current Range Thermal limit of R

SENSE

INQ

Quiescent Current V

=12V, I

OUT

= A

µA

M ON

step-response time I

OUT

step from A to 5A 5 µs

OPERATING PRINCIPL ES

The LT61 7 operates by amplifying the voltage drop on a

sense resistor placed in series w ith the pow er source of a

load to be monitored. The sense inputs of the amplifier

differentially measure the sense-resistor drop to control

an internal variable current source that allow s translation

of the input information to a level referenced to V–

(ground in this demo circuit). The circuit gain is

established by the ratio of the output resistor to the input

resistor and is essentially as accurate as the resistors

used. In DC1363 as shipped, the sense resistor installed

is 1 m

Ω

and the resistor ratio sets the gain to 5 V/V, so

the nominal output scaling is 5 mV per Ampere of load

current. O ther scalings can be produced by resistor

replacement on the demo circuit.

The DC1363 Schematic diagram is show n in Figure 2.

DEMO CIRCUIT

1 3 6 3

Q UICK S TA RT G UIDE

L T6 1 0 7

H ig h Te m p e ra t re H ig h S id e

C rre n t S e n se in a S OT-

2 3

LT6107

Q U ICK START PROCEDU RE

Demonstration circuit 1363 is easy to set up to evaluate

the performance of the LT61 7. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below :

W ith pow er off, connect the pow er supply positive to

IN and the common to GND. This supply should be in

the range of 2.7V to 36V. If this supply is not equipped

w ith an accurate current readout, a DM M (set to

measure Amperes) may be connected in series w ith

the supply as show n in Figure 1.

NOTE.

Be sure that the current capacity of the DM M is adequate to

handle the intended load current.

Connect a voltmeter or oscilloscope probe to the M O N

terminal, w ith the common connection or ground clip

tied to GND.

Connect a load to the O UT terminal (positive) and

return (negative) to the common of the pow er supply.

The load may be a pow er resistor, active load

instrument, or other circuit of interest.

Turn on the pow er supply.

M easure an output voltage that corresponds to the

load current. V

M ON

= .5

OUT

for the factory installed

resistors.

LOAD

(10Ω)

+ COM

POWER

SUPPLY









DMM

A COM V





DMM

A COM V

Figure 1. Proper easurem ent Equipm ent Setup

LT6107

Figure 2. DC1363 Schem atic Diagram

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