Linear Technology DC1698A Guida rapida alla configurazione

dc1698afa

DEMO MANUAL DC1698A

DESCRIPTION

LT1999: High Voltage,

Bidirectional Current

Sense Ampliﬁer

Demonstration circuit 1698A features the LT1999, a high

voltage, bi-directional current sense ampliﬁer.

The demo board ampliﬁes the voltage drop across an on

board current sense resistor. The output voltage is a bi-

directional signal that is centered on the VREF voltage and

is proportional to the current through the sense resistor.

The output is scaled by one of three ﬁxed gain options. The

gain options are: 10V/V (DC1698A-A), 20V/V (DC1698A-B)

PERFORMANCE SUMMARY

and 50V/V (DC1698A-C). The input voltage range is from

–5V to 80V (independent of the device supply voltage)

allowing the part to be used for high or low side current

sensing.TheLT1999requiresaseparate5Vsupplyvoltage.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Table 1. Performance Summary (TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VSSupply Range 4.5 5.5 V

VCM CM Input Voltage Range –5 80 V

CMRR Common Mode Rejection Ratio VCM = 0V , 7VP-P, f = 100kHz 80 100 dB

VOUT Swing Output High (with Respect to V+)

Swing Output Low (with Respect to V–)

RLOAD = Open

150

125

225

VOSI Input Referred Offset Voltage TA= 25°C, VCM > 5.5V 550 µV

IQV+Quiescent Current VCM > 5.5V 1.55 mA

VREF Open Circuit Voltage VS= 5V 2.44 2.5 2.55 V

VREFIN REF Pin Input Range 1.25 V+– 1.5 V

OPERATING PRINCIPLES

The LT1999 operates by amplifying the voltage drop

across a user selected sense resistor. The voltage across

the resistor is ampliﬁed by a ﬁxed gain of 10V/V, 20V/V

or 50V/V(LT1999-10,LT1999-20,LT1999-50) and is level

shifted to the OUT pin of the device. The voltage difference

and polarity with respect to the VREF pin voltage indicates

the magnitude and direction of the current in the sense

resistor.

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dc1698afa

DEMO MANUAL DC1698A

QUICK START PROCEDURE

Demonstration circuit 1698 is easy to set up and evaluate

the performance of the LT1999. Refer to Figure 1 for proper

measurement equipment setup and follow the procedure:

1. With power off, connect a power supply to V+and the

common to GND. This supply should be between 4.5V

and 5.5V. Connect a second supply’s positive terminal

to the VSENSE+and connect its common to the circuit

ground. The second supply’s (load supply) output volt-

age can range from –5V to 80V.

2. With power off, connect the load to the VSENSE–. If

the load power source does not have accurate current

readout a DMM may be connected in series with the

load as shown in Figure 1.

3. Connect a voltmeter to the VOUT terminal, with the com-

monconnectedtotheVREF terminal. Anoscilloscopecan

also be used to monitor Vout with respect to ground.

4. Turn on the power supply to the device and the load

supply.

5. Measure the output voltage with respect to VREF. The

output voltage will be proportional to the load and with

the factory set sense resistor will equal 0.5V per 1A.

BLOCK DIAGRAM

SHDN

V+

V(G+IN)

V(G–IN)

R+IN

R–IN

300

4pF

0.8k

R+S

0.8k

R–S

160k

1999 BD

2µA

OUT

REF

+IN

–IN

GND

LT1999

–

GIN

4.5k

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dc1698afa

DEMO MANUAL DC1698A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

LOAD

10

1.00V

2.00A

20V 5.00V VOUT

DEVICE SUPPLY

(4.5V TO 5.5V)

LOAD SUPPLY

(–5V TO 80V)

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dc1698afa

DEMO MANUAL DC1698A

PARTS LIST

ITEM QUANTITY REFERENCE DESCRIPTION MANUFACTURER’S PART NUMBER

General BOM

1 2 C1, C2 Capacitor, 0.1µF 10% 25V X7R 0603 AVX, 06033C104KAT2A

2 1 C3 Capacitor, 100pF 10% 16V X7R 0402 AVX, 0402YC101KAT2A

3 1 R2 Resistor, 0Ω 0603 1% 1/16W YAGEO, RC0603FR-070RL

DC1698A-A

1 1 DC1698A General BOM

2 1 R1 Resistor, 0.05Ω 1% 2512 2W SEI, CSRN2512FT50L0

3 1 U1 IC, LT1999IMS8-10 Linear Technology, LT1999IMS8-10#PBF

DC1698A-B

1 1 DC1698A General BOM

2 1 R1 Resistor, 0.025Ω 1% 2512 1W Vishay, WSL2512R0250FEA

3 1 U1 IC, LT1999IMS8-20 Linear Technology, LT1999IMS8-20#PBF

DC1698A-C

1 1 DC1698A General BOM

2 1 R1 Resistor, 0.01Ω 1W 1% 2512 SMD Vishay, WSL2512R0100FEA

3 1 U1 IC, LT1999IMS8-50 Linear Technology, LT1999IMS8-50#PBF

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dc1698afa

DEMO MANUAL DC1698A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for itsuse. Linear Technology Corporation makes no representation

that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

VSUPPLY

IN+

IN-

VSUPPLY

4GND 5

VREF 6

VOUT 7

VSHDN\ 8

LT1999IMS8*

4.5V - 5.5V E6

0.1uF

1VOUT

0.1uF

1GND

1VREF

V+

HIGH VOLTAGE BI-DIRECTIONAL CURRENT SENSE

10/2010

LT1999IMS8-10/-20/-50

SH 1 of 1

1630 McCarthy Blvd.

Milpitas, CA 95035

PH: (408) 432-1900

ASSY

-A

-B

LT1999IMS8-10

LT1999IMS8-20

1/SHDN

-C LT1999IMS8-50

0.05 ohm

0.025 ohm

0.01 ohm

100pF

-5V - +80V

0 Ohm

ECO REV DESCRIPTION APPR DATE

1 PRODUCTION

CUYLER L.

10/01/2010

LTC CONFIDENTIAL FOR-

TITLE: SCHEMATIC

IC NO. REV

APPROVALS

CUYLER L.

PCB DES.

APP ENG.

DEMO CIRCUIT 1698A

WWW.LINEAR.COM

DATE:

SIZE

N/A

SCALE = NONE

CUSTOMER USE ONLY

2512

0402

VSENSE +

VSENSE -

V+

2V AT 4A

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603

2. ALL CAPACTORS ARE IN MICROFARADS, 0603

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT

SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS

PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND

AFFECT CIRCUIT PERFORMANCE OR RELIABILITY.

CONTACT LINEAR TECHNOLOGY APPLICATIONS

THIS CIRCUIT IS PROPRIETARY TO

USE WITH LINEAR TECHNOLOGY PARTS.

TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-

THE CUSTOMER'S RESPONSIBILITY TO VERIFY

PRINTED CIRCUIT LAYOUT MAY SIGNIFICANTLY

ENGINEERING FOR ASSISTANCE.

LINEAR TECHNOLOGY AND SUPPLIED FOR

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dc1698afa

DEMO MANUAL DC1698A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0911 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union direc-

tive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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