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Linear Technology DC1699A Demo Manual

Lt6108-1/lt6108-2 high side current sense amplifier with reference and a comparator
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DESCRIPTION
Demonstration circuit 1699A features the LT
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
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Measured Output Signal
IOUT
I
Output Load Current Range
OUT
I
V
Quiescent Current DC1699A-A
QA
IN
I
V
Quiescent Current DC1699A-B
QB
IN
V
Comparator Threshold
THR
OPERATING PRINCIPLES
The LT6108 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.
Arrow.com.
Downloaded from
DEMO MANUAL DC1699A
High Side Current Sense Amplifier
with Reference and a Comparator
®
6108, a
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
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.
(T
= 25°C)
A
CONDITIONS
I
= 100mA
LOAD
Thermal Limit of R
SENSE
V
= 12V
IN
V
= 12V
IN
V
= 1.25V
IOUT
V
BATT
R
SENSE
I
SENSE
LT6108-1/LT6108-2
MIN
2.7
+
V
7
+
V
LT6108
R
IN
8
SENSEHI
–
1
SENSELO
+
–
V
4
Figure 1. Amplifier Operation
TYP
MAX
UNITS
60
V
250
mV
4
A
800
μA
650
μA
500
mA
OUTA 6
V
OUT
R
OUT
dc1699a F01
dc1699af
1

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Summary of Contents for Linear Technology DC1699A

  • Page 1 A and B, indicating which version of the LT6108 L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks is installed. The DC1699A-A (LT6108-1) has a latching of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Block Diagrams

    DEMO MANUAL DC1699A BLOCK DIAGRAMS LT6108-1 100Ω SENSEHI – SENSELO OUTA – – – 200nA EN/RST ENABLE AND RESET TIMING RESET OVERCURRENT FLAG OUTC 400mV REFERENCE – – dc1699a BD1 LT6108-1 LT6108-2 100Ω SENSEHI – SENSELO OUTA – – –...

  • Page 3: Quick Start Procedure

    QUICK START PROCEDURE The DC1699A provides a simple way to evaluate the 4. Turn on the power supply. If using the DC1699A-A , performance of the LT6108. Refer to Figure 2 for proper the comparator starts in an unknown state and must measurement equipment setup and follow the procedure be reset.

  • Page 4: Operation

    DEMO MANUAL DC1699A OPERATION Current Sense Gain Optional Settings The gain of the LT6108 current sense amplifier is set by 1. For supply voltages below 3.3V, remove R15 and install the ratio of R and R resistors. In the demo circuit this R16 (0Ω...

  • Page 5: Parts List

    DEMO MANUAL DC1699A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1699A Genreral BOM Capacitor, 1μF 20% 1206 100V X7R AVX 12061C105MAT2A Capacitor, 0.47μF 20% 0603 16V X5R AVX 0603YD474MAT2A Capacitor, 0.1μF 10% 0402 16V X5R AVX 0402YD104KAT2A Capacitor, 0.1μF 10% 0603 100V X7R...

  • Page 6: Schematic Diagram

    DEMO MANUAL DC1699A SCHEMATIC DIAGRAM dc1699af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 7 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 8 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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