Linear Technology DC1699A Quick setup guide

dc1699af

DEMO MANUAL DC1699A

DESCRIPTION

LT6108-1/LT6108-2

High Side Current Sense Amplifier

with Reference and a Comparator

Demonstration circuit 1699A features the LT

6108, a

high side current sense amplifier with a comparator and

a 400mV reference.

The demo board circuit amplifies the voltage across an

onboard current sense resistor, to provide a precision

unipolar voltage output that is proportional to the sensed

current. The board has one onboard comparator and an

integrated 400mV reference that sets the threshold for the

comparator. There are two versions of this demonstration

circuit, A and B, indicating which version of the LT6108

is installed. The DC1699A-A (LT6108-1) has a latching L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks

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

owners.

PERFORMANCE SUMMARY

OPERATING PRINCIPLES

comparator, while the DC1699A-B (LT6108-2) has a non

latching comparator. Both current sense gain and cur-

rent fault limits are set by onboard resistors and are the

same for both boards. The gain is set at 25V/V and the

comparator is set to trip at a current threshold of 500mA.

The key performance specifications are listed in the table

below.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 2.7 60 V

VIOUT Measured Output Signal ILOAD = 100mA 250 mV

IOUT Output Load Current Range Thermal Limit of RSENSE 4A

IQA VIN Quiescent Current DC1699A-A VIN = 12V 800 μA

IQB VIN Quiescent Current DC1699A-B VIN = 12V 650 μA

VTHR Comparator Threshold VIOUT = 1.25V 500 mA

TheLT6108 operates by amplifying the voltage drop across

a sense resistor that is in series with the load. The voltage

drop at the amplifier inputs is translated, via the internal

variable current source, to a ground referenced signal at

the amplifier output. The circuit gain is set by the ratio of

the output resistor to the input resistor(see Figure 1). The

comparator thresholds are set by the internal reference

and the current trip points are set by dividing the output

resistance into a network of three resistors. The DC1699A

is shipped with a 100mΩ sense resistor, a gain of 25 and

current fault threshold of 500mA.

SENSEHI

LT6108

ISENSE

RSENSE

V+

V–

V+

RIN

VBATT

SENSELO

1OUTA 6

dc1699a F01

ROUT

VOUT

–

Figure 1. Amplifier Operation

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dc1699af

DEMO MANUAL DC1699A

BLOCK DIAGRAMS

LT6108-1

LT6108-2

100Ω

OUTA

–

INC 5

V+

dc1699a BD1

V+

V–

V+

SENSEHI

LT6108-1

SENSELO

200nA

RESET

OVERCURRENT FLAG

2EN/RST

3OUTC

34V 6V

ENABLE AND

RESET TIMING

V–

400mV

REFERENCE

100Ω

OUTA

–

INC 5

V+

dc1699a BD2

V+

V–

V+

SENSEHI

LT6108-2

SENSELO

100nA

OVERCURRENT FLAG

2EN

3OUTC

34V 6V

V–

400mV

REFERENCE

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dc1699af

DEMO MANUAL DC1699A

QUICK START PROCEDURE

Figure 2.

The DC1699A provides a simple way to evaluate the

performance of the LT6108. Refer to Figure 2 for proper

measurement equipment setup and follow the procedure

below:

1. With the power off, connect the power supply positive

to IN and the common to GND. With default board

settings the supply can range from 3.3V to 60V. If the

supply does not have an accurate current readout, a

DMM may be connected in series with the supply as

shown in Figure 2.

2. Connect a DMM or oscilloscope to the IOUT with the

common connection connected to ground.

3. Connect a load to the demo boards OUT terminal (posi-

tive) and ground. The load may be a power resistor,

active load instrument or a circuit of interest.

4. Turn on the power supply. If using the DC1699A-A ,

the comparator starts in an unknown state and must

be reset. This can be done by pressing the reset but-

ton. With the load shown in Figure 2 the comparator

outputs should be high.

5. Measure the output voltage and confirm it corresponds

to the load current. VIOUT = 2.5 • ILOAD for the factory

installed resistors.

6. If possible, sweep the load current from 0mA to 500mA

to verify the operation of the comparator. The LED will

turn on when the comparator output has gone low. If

using the DC1699A-A, use the reset circuitry to reset

the comparator output.

0.10A

20.0V

250mV

RESET BUTTON

LOAD

ϮϬϬɏ

250mV

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dc1699af

DEMO MANUAL DC1699A

OPERATION

Current Sense Gain

The gain of the LT6108 current sense amplifier is set by

the ratio of ROUT and RIN resistors. In the demo circuit this

means that the gain is set by the ratio of (R1 + R2 )/R7.

The gain error is primarily controlled by the precision of

the resistors used. The installed resistors are 1% tolerance

which will dominate the gain error. To reduce system gain

error, the resistors can be replaced with 0.1% resistors.

LED Indicator

The LED indicates the state of the comparator output.

When the LED is on, the comparator’s output is low. When

the LED is off, the comparators output is high. When the

comparator output is latched low, the LT6108-1 must be

resettounlatchthecomparatoroutputandturnofftheLED.

Jumper Summary

Reset (JP1): The Reset jumper has two settings for manual

or auto mode. In manual mode, the user must press the

reset button to trigger the LTC6993 to send the 5μs pulse

that resets the latching comparators. In auto mode, the

LTC6991 will continuously reset the comparators every

10 seconds. The factory default setting is manual mode.

Optional Settings

1. For supply voltages below 3.3V, remove R15 and install

R16 (0Ω jumper). When R16 is installed, the supply

voltage must stay between 2.7V to 6V to prevent dam-

aging the TimerBlox

circuitry that is used to reset the

comparator output.

2. To power the LT6108 from a supply separate from the

load, remove R17 and connect the power supply to V+

turret. The input cannot go more than 33V below V+.

3. There are a number of optional components (not

installed) that allow the DC1699 to be tailored to a

specific application:

To disconnect comparator input CIN from IOUT, re-

move R1 and R2 and install R14.

To add filtering to the amplifier output, install C6.

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dc1699af

DEMO MANUAL DC1699A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1699A Genreral BOM

1 1 C1 Capacitor, 1μF 20% 1206 100V X7R AVX 12061C105MAT2A

2 1 C2 Capacitor, 0.47μF 20% 0603 16V X5R AVX 0603YD474MAT2A

3 1 C5 Capacitor, 0.1μF 10% 0402 16V X5R AVX 0402YD104KAT2A

4 1 C7 Capacitor, 0.1μF 10% 0603 100V X7R Murata/GRM188R72A104KA35D

5 3 E1, E2, E6 TURRET TERMINAL Mill Max 2501-2-00-80-00-00-07-0

6 5 E3-E5, E9, E10 TURRET TERMINAL Mill Max 2308-2-00-80-00-00-07-0

7 1 LED2 RED1206 LED Panasonic/LN1251C

8 1 R1 Resistor, 1.69k 1% 0603 1/16W VISHAY/CRCW06031K69FKEA

9 1 R2 Resistor, 806 1% 0603 1/16W VISHAY/CRCW0603806RFKLEA

10 2 R3, R10 Resistor, 10k 5% 0402 1/16W VISHAY/CRCW040210K0JNED

11 1 R5 Resistor, 1k 5% 0603 1/16W VISHAY/CRCW06031K00JNEA

12 2 R6, R7 Resistor, 100 1% 0603 1/16W VISHAY/CRCW0603100RFKEA

13 1 R8 Resistor, 13.7k 1% 0402 1/16W VISHAY/CRCW040213K7FKED

14 1 R11 Resistor, 0.1Ω 1% 2512 2W IRC/LR2512LF-01-R100-F

15 0 R14 OPTIONAL

16 2 R15, R17 Resistor, 0Ω 0603 1/16W VISHAY/CRCW06030000Z0EA

17 1 U2 IC, LT3010EMS8E#PBF Linear Technology Corp.LT3010EMS8E#PBF

DC1699A-A

1 1 DC1699A GENERAL BOM DC1699A

2 1 C4 Capacitor, 0.1μF 20% 0402 10V X5R TDK/C1005X5R1A104M

3 1 JP1 HEADER, 3-PIN SAMTEC TSW-103-07-L-S

4 1 JP1 SHUNT SAMTEC SNT-100-BK-G

5 1 R4 Resistor, 124k 1% 0402 1/16W VISHAY/CRCW0402124KFKED

6 1 R9 Resistor, 249k 1% 0402 1/16W VISHAY/CRCW0402249KFKED

7 2 R12, R18 Resistor, 1M 1% 0402 1/16W VISHAY/CRCW04021M00FKED

8 1 R13 Resistor, 392k 1% 0402 1/16W VISHAY/CRCW0402392KFKED

9 1 SW1 Switch, push button Panasonic/EVQPPDA25

10 1 U1 IC, LT6108IMS-1 Linear Technology Corp. LT6108IMS-1

11 1 U3 IC, LTC6993CS6-1#PBF Linear Technology Corp. LTC6993CS6-1#PBF

12 1 U4 IC, LTC6991CS6#PBF Linear Technology Corp. LTC6991CS6#PBF

DC1699A-B

1 1 DC1699A GENERAL BOM DC1699A

2 1 U1 IC, LT6108IMS-2 Linear Technology Corp. LT6108IMS-2

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dc1699af

DEMO MANUAL DC1699A

SCHEMATIC DIAGRAM

RESET

1.69k

806

10k

LED2

1206 LED

100

R14

OPT

R11

0.1 Ohm

IN OUT

IOUT

CIN

COUT

GND

3.3V-60V

C6 OPT

0.1uF

R17

0 OHM

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603

2. ALL CAPACTORS ARE IN MICRO FARADS, 0603

3. INSTALL SHUNTS AT J1 PIN 1+2

V+ ASSY

-A

-B

LT6108IMS8-1

LT6108IMS8-2

SENSE - 1

SENSE +

V+

CIN 5

COUT

EN/RST

GND

IOUT 6

LT6108IMS8*

PRECISION CURRENT SENSE WITH COMPARATOR AND REFERENCE

07/2010

LT6108IMS8-1/-2

SH 1 of 2

1630 McCarthy Blvd.

Milpitas, CA 95035

PH: (408) 432-1900

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT

LTC CONFIDENTIAL FOR-

TITLE: SCHEMATIC

IC NO. REV

APPROVALS

CUYLER L.

PCB DES.

APP ENG.

DEMO CIRCUIT 1699A

WWW.LINEAR.COM

DATE:

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.

SIZE

N/A

SCALE = NONE

CUSTOMER USE ONLY

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

ECO REV DESCRIPTION APPR DATE

1 PRODUCTION CUYLER L. 07/01/2010

2512 4A MAX

0402

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dc1699af

DEMO MANUAL DC1699A

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

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

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

SCHEMATIC DIAGRAM

RESET

1uF C2

0.47uF

249k

1SW1

OUT 6

V+ 5

DIV 4

SET

GND

TRIG

LT6993CS6-1

0.1u

13.7k

R10

10k

0.1uF

JP1

OUT 6

V+ 5

DIV 4

SET

GND

RST

LT6991CS6

124k

R12

1Meg

R13

392k

EN/RST

SHDN

OUT 1

SENSE 2

V-

LT3010EMS8 R15

R16

OPT

RESET AUTOMAN

V+

12 3

R18

PRECISION CURRENT SENSE WITH COMPARATOR AND REFERENCE

07/2010

LT6108IMS8-1/-2

SH 2 of 2

1630 McCarthy Blvd.

Milpitas, CA 95035

PH: (408) 432-1900

LTC CONFIDENTIAL FOR-

TITLE: SCHEMATIC

IC NO. REV

APPROVALS

CUYLER L.

PCB DES.

APP ENG.

DEMO CIRCUIT 1699A

WWW.LINEAR.COM

DATE:

SIZE

N/A

SCALE = NONE

CUSTOMER USE ONLY

**COMPONENTS ARE OPTIONAL ON

DC1699A-B ASSEMBLY

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

3.3V-60V 2.7V-5V

0402

1206

RESET

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dc1699af

DEMO MANUAL DC1699A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0911 • 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

directive 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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