Linear Technology DC1698A Guide de configuration rapide
1
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
RLOAD = Open
5
150
125
225
mV
mV
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+
D1
V+
V+
V+
V(G+IN)
V(G–IN)
2k
R+IN
R–IN
300
CF
4pF
0.8k
R+S
0.8k
R–S
160k
160k
1999 BD
2µA
OUT
REF
+IN
–IN
GND
LT1999
+
–
+
–
GIN
RG
AO
2k
2k
4.5k
2k
8
7
2
1
3
4
6
5
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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
1
IN+
2
IN-
3
VSUPPLY
4GND 5
VREF 6
VOUT 7
VSHDN\ 8
U1
LT1999IMS8*
1
4.5V - 5.5V E6
C1
0.1uF
1VOUT
E3
C2
0.1uF
1GND
E5
1VREF
E4
V+
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
U1
*
1/SHDN
E7
-C LT1999IMS8-50
0.05 ohm
0.025 ohm
0.01 ohm
C3
100pF
-5V - +80V
R2
0 Ohm
*
ECO REV DESCRIPTION APPR DATE
1 PRODUCTION
CUYLER L.
10/01/2010
LTC CONFIDENTIAL FOR-
TITLE: SCHEMATIC
IC NO. REV
1
APPROVALS
CL
CUYLER L.
PCB DES.
APP ENG.
DEMO CIRCUIT 1698A
WWW.LINEAR.COM
DATE:
SIZE
N/A
SCALE = NONE
CUSTOMER USE ONLY
R1
2512
R1
0402
1
VSENSE +
E1
1
VSENSE -
E2
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
© LINEAR TECHNOLOGY CORPORATION 2011
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
Copyright © 2004, Linear Technology Corporation
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