Linear Technology DC1659A User manual

dc1659af

DEMO MANUAL DC1659A

DESCRIPTION

LT6109-1/LT6109-2

High Side Current Sense

Amplifiers with Reference

and Comparators

Demonstration circuit 1659A features the LT

6109, a high

side current sense amplifier with two comparators and a

400mV reference.

The demo board circuit amplifies the voltage across an

on-board current sense resistor, to provide a precision

unipolar voltage output that is proportional to the sensed

current. The board has two on-board comparators with

latching outputs and an integrated 400mV reference that

sets the threshold for the comparators. There are two ver-

sions of this demonstration circuit, A and B, depending on

which version of the LT6109 is installed. The DC1659A-A

(LT6109-1) has an inverting and a noninverting compara-

tor input available, while the DC1659A-B (LT6109-2) has

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

two inverting inputs available. Both current sense gain

and current fault limits are set by on board resistors and

are the same for both boards. The gain is set at 100V/V

and the comparators are set to trip at current thresholds

of 50mA and 300mA.

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)

TheLT6109 operates by amplifying the voltage drop across

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

inputs of the amplifier differentially measure the sense

resistor voltage drop to control an internal variable current

source that allows translation of the input voltage level to

a level referenced to the GND. The circuit gain is set by

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 2.7 60 V

VIOUT Measured Output Signal ILOAD = 100mA 1 V

IIOUT Measured Output Current VIOUT = 1V 100 μA

ILOAD Output Load Current Range Thermal Limit of RSENSE 4A

IQIN Quiescent Current VIN = 12V 800 μA

VTHR1 Comparator1 Threshold VIOUT = 3.0V 300 mA

VTHR2 Comparator2 Threshold VIOUT = 0.5V 50 mA

the ratio of the output resistor to the input resistor. 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 DC1659

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

current fault thresholds of 50mA and 300mA.

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dc1659af

DEMO MANUAL DC1659A

BLOCK DIAGRAMS

LT6109-1 (DC1659A-A) LT6109-2 (DC1659A-B)

100Ω

OUTA

–

INC2 7

INC1

V+

V–

610912 F01

V+

V–

V+

SENSEHI

LT6109-1

SENSELO

200nA

RESET

UNDERCURRENT FLAG

OVERCURRENT FLAG

2EN/RST

3OUTC2

4OUTC1

34V 6V

ENABLE AND

RESET TIMING

–

V–

V+

400mV

REFERENCE

100Ω

OUTA

–

INC2 7

INC1

V+

V–

610912 F02

V+

V–

V+

SENSEHI

LT6109-2

SENSELO

200nA

RESET

OVERCURRENT FLAG

2EN/RST

3OUTC2

4OUTC1

34V 6V

ENABLE AND

RESET TIMING

–

V–

V+

400mV

REFERENCE

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DEMO MANUAL DC1659A

QUICK START PROCEDURE

Figure 1. Test Setup

The DC1659A provides a simple way to evaluate the

performance of the LT6109. Refer to Figure1 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1.

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. The comparators start in an

unknown state and must be reset. This can be done

by pressing the reset button. With the load shown in

Figure 1 the comparator outputs should be:

PART COUT1 COUT2

DC1659A-A LT6109-1 High High

DC1659A-B LT6109-2 High Low

5. Measure the output voltage and confirm it corresponds

to the load current. VIOUT = 10 • ILOAD for the factory

installed resistors.

6. If able, sweep load current from 0mA to 300mA to verify

the operation of the comparators. The LED will turn on

when the comparator output has latched low. Use the

reset circuitry to reset comparator output.

0.10A

20.0V

1.0V

Load

200Ω

Reset

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dc1659af

DEMO MANUAL DC1659A

OPERATION

Current Sense Gain

The gain of the LT6109 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 + R3)/R10. The gain error is primarily controlled

by the precision of the resistors used. The factory resis-

tors are a 1% tolerance which will dominate the gain

error. To reduce system gain error, the resistors can be

replaced with 0.1% resistors.

LED Indicators

The LEDs indicate the state of the comparator outputs.

When the LED is on, the comparator is latched low. When

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

comparatoroutputislatchedlow,theLT6109 must be reset

to refresh the comparator output and to turn off the LEDs.

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 reset the latching comparators. In auto

mode, the comparators will be continuously reset every

10 seconds. The factory default setting is manual mode.

Optional Settings

1. For supply voltages below 3.3V, remove R20 and install

R21 (0Ω jumper). When R21 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 outputs.

2. To power the LT6109 from a supply separate from the

load, remove R22 and connect the power supply to V+

turret.

3. There are a number of optional components that (not

installed) allow the DC1659 to be tailored to a specific

application:

A) To free comparator input INC1, remove R2 and R3

and install R19.

B) To free comparator input INC2, remove R1 and R2

and install R18.

C) To add filtering to the amplifier output, install C6.

4. R9 can be set to the same value as R10 to reduce error

caused by input bias current. Typically for values of

R10 (less than 1k) and R9 can be omitted as the error

is negligible.

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DEMO MANUAL DC1659A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 Capacitor, 1μF 20% 1206 100V X7R TDK/C3216X7R2A105M

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

3 2 C4, C5 Capacitor, 0.1μF 20% 0402 10V X5R Taiyo Yuden/LMK105BJ104MV-F

4 1 C6 Capacitor, 0.1μF 20% 0603 X5R Optional

5 1 C7 Capacitor, 0.1μF 10% 0603 100V X7R Murata/GRM188R72A104KA35D

6 3 E1, E2, E8 Turret Terminal Mill Max 2501-2-00-80-00-00-07-0

7 7 E3-E7, E9, E10 Turret Terminal Mill Max 2308-2-00-80-00-00-07-0

8 1 JP1 Header, 3-Pin, 2mm SAMTEC TMM-103-02-L-S

9 1 JP1 Shunt SAMTEC 2SN-BK-G

10 2 LED1, LED2 Red1206 LED Panasonic/LN1251C

11 1 R1 Resistor, 2k 1% 0603 1/16W AAC/CR16-2001FM

12 1 R2 Resistor, 6.65k 1% 0603 1/16W Vishay/CRCW06036K65FKEA

13 1 R3 Resistor, 1.33k 1% 0603 1/16W AAC/CR16-1331FM

14 3 R4, R5, R14 Resistor, 10k 5% 0402 1/16W AAC/CR05-103JM

15 1 R6 Resistor, 118k 1% 0402 1/16W AAC/CR05-1243FM

16 2 R7, R8 Resistor, 1k 5% 0603 1/16W Vishay/CRCW04021K00JNED

17 1 R10 Resistor, 100Ω 1% 0603 1/16W Vishay/CRCW0603100RFKEA

18 1 R11, R22 Resistor, 0Ω 0402 1/16W Vishay/CRCW04020000Z0ED

19 1 R12 Resistor, 13.7k 1% 0402 1/16W AAC/CR05-1372FM

20 1 R13 Resistor, 249k 1% 0402 1/16W AAC/CR05-2493FM

21 1 R15 Resistor, 0.1Ω 1% 2512 2W IRC/LR2512LF-01-R100-F

22 1 R16, R23 Resistor, 1M 1% 0402 1/16W AAC/CR05-1004FM

23 1 R17 Resistor, 392k 1% 0402 1/16W AAC/CR05-3923FM

24 3 R18, R19, R21 Optional

25 2 R20, R9 Resistor, 0Ω 0603 1/16W AAC/CJ06-000M

26 1 SW1 Switch, Pushbutton Panasonic/EVQPPDA25

28 1 U2 IC, LT3010EMS8E#PBF Linear Technology Corp.

29 1 U3 IC, LT6993CS6-1#PBF Linear Technology Corp.

30 1 U4 IC, LT6991CS6#PBF Linear Technology Corp.

DC1659A-A

1 1 U1 IC, LT6109IMS-1 Linear Technology Corp. LT6109IMS-2

DC1659A-B

1 1 U1 IC, LT6109IMS-2 Linear Technology Corp. LT6109IMS-2

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dc1659af

DEMO MANUAL DC1659A

SCHEMATIC DIAGRAM

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dc1659af

DEMO MANUAL DC1659A

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

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dc1659af

DEMO MANUAL DC1659A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0611 • 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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