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ADR293 データシート(PDF) 10 Page - Analog Devices

部品番号 ADR293
部品情報  Low Noise Micropower Precision Voltage Reference
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
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ADR293 データシート(HTML) 10 Page - Analog Devices

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ADR293
REV. 0
–10–
Kelvin Connections
In many portable instrumentation applications where PC board
cost and area go hand-in-hand, circuit interconnects are very often
of dimensionally minimum width. These narrow lines can cause
large voltage drops if the voltage reference is required to provide
load currents to various functions. In fact, a circuit’s interconnects
can exhibit a typical line resistance of 0.45 mW/square (1 oz. Cu,
for example). Force and sense connections also referred to as
Kelvin connections, offer a convenient method of eliminating the
effects of voltage drops in circuit wires. Load currents flowing
through wiring resistance produce an error (VERROR = R
IL ) at
the load. However, the Kelvin connection of Figure 22 overcomes
the problem by including the wiring resistance within the forcing
loop of the op amp. Since the op amp senses the load voltage, op
amp loop control forces the output to compensate for the wiring
error and to produce the correct voltage at the load.
ADR293
4
6
2
VIN
GND
VOUT
100k
RLW
1 F
A1
+VOUT
SENSE
+VOUT
FORCE
RLW
VIN
RL
A1 = 1/2 OP295
Figure 22. Advantage of Kelvin Connection
Voltage Regulator For Portable Equipment
The ADR293 is ideal for providing a stable, low cost and low
power reference voltage in portable equipment power supplies.
Figure 23 shows how the ADR293 can be used in a voltage
regulator that not only has low output noise (as compared to
switch mode design) and low power, but also a very fast recovery
after current surges. Some precautions should be taken in the
selection of the output capacitors. Too high an ESR (effective
series resistance) could endanger the stability of the circuit. A
solid tantalum capacitor, 16 V or higher, and an aluminum elec-
trolytic capacitor, 10 V or higher, are recommended for C1 and
C2, respectively. Also, the path from the ground side of C1 and
C2 to the ground side of R1 should be kept as short as possible.
2
3
6
7
2
4
4
VIN
GND
ADR293
R1
402k
1%
R2
402k
1%
OP-20
++
C1
68 F
TANT
C2
1000 F
ELECT
+5V, 100mA
IRF9530
R3
510k
CHARGER
INPUT
+
LEAD-ACID
BATTERY
6V
VOUT 6
0.1 F
Figure 23. Voltage Regulator for Portable Equipment


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