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Linear Technology DC2193A Demo Manual

High side current sense amplifier with reference and comparator with por capability
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High Side Current Sense Amplifier with Reference
Description
Demonstration circuit 2193A features the
high side current sense amplifier with a comparator 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 one on-board latching comparator and an
integrated 400mV reference that sets the threshold for the
comparator. The demonstration board includes circuitry
to guarantee that the comparator resets on power up. The
performance summary
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Measured Output Signal
IOUT
I
Measured Output Signal(Current Mode)
IOUT
I
Output Load Current Range
OUT
I
V
Quiescent Current
Q
IN
V
Comparator Threshold
THR
operating principles
The LT6118 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
the ratio of the output resistor to the input resistor. The
comparator thresholds are set by the LT6118 internal
Arrow.com.
Downloaded from
DEMO MANUAL DC2193A
and Comparator with POR Capability
LT
6118, a
current sense gain and current fault limits are set by on
®
board resistors. The gain is 2.5V/A and the comparator
is set to trip at 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/DC2193A
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.
Specifications are at T
CONDITIONS
I
= 100mA
LOAD
V
= 250mV
IOUT
Thermal Limit of R
V
= 12V
IN
V
= 1.25V
IOUT
reference and the current trip points are set by dividing
the output resistance into a network of three resistors. The
RC filter connected to the Latch Enable (LE) pin guaran-
tee that the LE pin is held low long enough on startup to
reset the comparator output on power on. The DC2193 is
shipped with a 100mΩ sense resistor. The amplifier gain
is 25V/V, providing an overall circuit gain of 2.5V/A. The
overcurrent fault threshold is set to 500mA.
= 25°C
A
MIN
2.7
SENSE
LT6118
TYP
MAX
UNITS
60
V
250
mV
100
µA
4
A
800
µA
500
mA
dc2193af
1

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Summary of Contents for Linear Technology DC2193A

  • Page 1 400mV reference that sets the threshold for the L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear comparator. The demonstration board includes circuitry Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Block Diagram

    DEMO MANUAL DC2193A Block Diagram SENSEHI – SENSELO OUTA – – – 100nA OVERCURRENT FLAG OUTC 400mV REFERENCE – – 6118 F01 dc2193af Arrow.com. Arrow.com. Downloaded from Downloaded from...

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC2193A Quick start proceDure The DC2193A provides a simple way to evaluate the per- 3. Connect a load to the demo boards OUT terminal (posi- formance of the LT6118. Refer to Figure 1 for proper mea- tive) and ground. The load may be a power resistor, surement equipment setup and follow these procedures: active load instrument or a circuit of interest.

  • Page 4: Operation

    DEMO MANUAL DC2193A operation Current Sense Gain Optional Settings The gain of the LT6118 current sense amplifier is set by 1. To power the LT6118 from a supply separate from the the ratio of R and R resistors. In the demo circuit this load, remove R1 and connect the power supply to V means that the gain is set by the ratio of (R7 + R9) /R4.

  • 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 representa- tion 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.

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Lt6118

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