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Linear Technology DC1698A Demo Manual

High voltage, bidirectional current sense amplifier
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DESCRIPTION
Demonstration circuit 1698A features the LT1999, a high
voltage, bi-directional current sense amplifi er.
The demo board amplifi es the voltage drop across an on
board current sense resistor. The output voltage is a bi-
directional signal that is centered on the V
is proportional to the current through the sense resistor.
The output is scaled by one of three fi xed gain options. The
gain options are: 10V/V (DC1698A-A), 20V/V (DC1698A-B)
PERFORMANCE SUMMARY
Table 1. Performance Summary (T
SYMBOL
PARAMETER
V
Supply Range
S
V
CM Input Voltage Range
CM
CMRR
Common Mode Rejection Ratio
V
Swing Output High (with Respect to V
OUT
Swing Output Low (with Respect to V
V
Input Referred Offset Voltage
OSI
I
V
Q
V
Open Circuit Voltage
REF
V
REF Pin Input Range
REFIN
OPERATING PRINCIPLES
The LT1999 operates by amplifying the voltage drop
across a user selected sense resistor. The voltage across
the resistor is amplifi ed by a fi xed gain of 10V/V, 20V/V
or 50V/V(LT1999-10,LT1999-20,LT1999-50) and is level
Arrow.com.
Downloaded from
REF
= 25°C)
A
+
Quiescent Current
DEMO MANUAL DC1698A
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. The LT1999 requires a separate 5V supply voltage.
voltage and
Design fi les 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.
CONDITIONS
V
= 0V , 7V
, f = 100kHz
CM
P-P
+
)
R
= Open
LOAD
–
)
R
= Open
LOAD
T
= 25°C, V
> 5.5V
A
CM
V
> 5.5V
CM
V
= 5V
S
shifted to the OUT pin of the device. The voltage difference
and polarity with respect to the V
the magnitude and direction of the current in the sense
resistor.
LT1999: High Voltage,
Bidirectional Current
Sense Amplifi er
MIN
TYP
4.5
–5
80
100
5
150
550
1.55
2.44
2.5
1.25
pin voltage indicates
REF
MAX
UNITS
5.5
V
80
V
dB
125
mV
225
mV
μV
mA
2.55
V
+
V
– 1.5
V
dc1698afa
1

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Summary of Contents for Linear Technology DC1698A

  • Page 1 The output is scaled by one of three fi xed gain options. The 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.

  • Page 2: Block Diagram

    DEMO MANUAL DC1698A BLOCK DIAGRAM 2μA 4.5k SHDN –IN – – 0.8k 0.8k 300Ω 160k –S –IN 160k –IN LT1999 1999 BD QUICK START PROCEDURE Demonstration circuit 1698 is easy to set up and evaluate 3. Connect a voltmeter to the V terminal, with the com- the performance of the LT1999.
  • Page 3 DEMO MANUAL DC1698A QUICK START PROCEDURE LOAD SUPPLY DEVICE SUPPLY 1.00V 5.00V (–5V TO 80V) (4.5V TO 5.5V) 2.00A LOAD 10Ω Figure 1. Proper Measurement Equipment Setup dc1698afa Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...

  • Page 4: Parts List

    DEMO MANUAL DC1698A PARTS LIST ITEM QUANTITY REFERENCE DESCRIPTION MANUFACTURER’S PART NUMBER General BOM C1, C2 Capacitor, 0.1μF 10% 25V X7R 0603 AVX, 06033C104KAT2A Capacitor, 100pF 10% 16V X7R 0402 AVX, 0402YC101KAT2A Resistor, 0Ω 0603 1% 1/16W YAGEO, RC0603FR-070RL DC1698A-A...

  • Page 5: Schematic Diagram

    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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 6 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.

This manual is also suitable for:

1698aDc1698a-aDc1698a-bDc1698a-cLt1999

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