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參數(shù)資料
| 型號： | ADR392 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| 中文描述： | 精密低漂移2.048 V/2.5 V/4.096第V / 5.0V的SOT - 23封裝，帶有關(guān)斷參考 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 269K |
| 代理商： | ADR392 |
ADR390/ADR391/ADR392/ADR395
General-Purpose Current Source
Many times in low power applications, the need arises for a
precision current source that can operate on low supply vol-
tages. ADR390/ADR391/ADR392/ADR395 can be configured
as a precision current source. As shown in Figure 45, the circuit
configuration is a floating current source with a grounded load.
The reference’s output voltage is bootstrapped across R
SET
,
which sets the output current into the load. With this
configuration, circuit precision is maintained for load currents
in the range from the reference’s supply current, typically 90 μA
to approximately 5 mA.
Rev. F | Page 18 of 20
V
IN
ADR39x
GND
V
OUT
I
OUT
= I
SET
+ I
SY
(I
SET
)
R1
I
SY
ADJUST
R
SET
P1
R
L
V
OUT
V
IN
R1
0.1
μ
F
I
SY
(I
SET
)
I
SET
0
SHDN
Figure 44. A General-Purpose Current Source
High Power Performance with Current Limit
In some cases, the user may want higher output current
delivered to a load and still achieve better than 0.5% accuracy
out of the ADR39x. The accuracy for a reference is normally
specified on the data sheet with no load. However, the output
voltage changes with load current.
The circuit shown in Figure 45 provides high current without
compromising the accuracy of the ADR39x. The series pass
transistor Q1 provides up to 1 A load current. The ADR39x
delivers only the base drive to Q1 through the force pin. The
sense pin of the ADR39x is a regulated output and is connected
to the load.
The transistor Q2 protects Q1 during short-circuit limit faults
by robbing its base drive. The maximum current is
I
LMAX
≈
0.6 V/
R
S
I
L
V
IN
R1
4.7k
Q2
Q2N2222
Q2N4921
Q1
R
S
R
L
SHDN
V
IN
V
OUT (SENSE)
V
OUT (FORCE)
GND
U1
ADR39x
0
Figure 45. ADR39x for High Power Performance with Current Limit
A similar circuit function can also be achieved with the
Darlington transistor configuration, as shown in Figure 46.
ADR39x
V
IN
R1
4.7k
Q2
Q2N2222
Q2N4921
R
S
R
L
V
IN
V
OUT (SENSE)
V
OUT (FORCE)
GND
Q1
U1
0
SHDN
Figure 46. ADR39x for High Output Current
with Darlington Drive Configuration
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADR392ART-RL | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR392ART-RL7 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR395 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR395ART-RL7 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR392AUJZ-R2 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADR392A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Micropower, Low Noise Precision Voltage References with Shutdown |
| adr392art-r2 | 制造商:Analog Devices 功能描述:V-REF PRECISION 4.096V 5MA 5PIN SOT-23 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:PREC LOW DRIFT+4.096V REF - Bulk |
| ADR392ART-REEL | 制造商:Analog Devices 功能描述:V-REF PRECISION 4.096V 5MA 5PIN SOT-23 - Tape and Reel |
| ADR392ART-REEL7 | 制造商:Analog Devices 功能描述:V-Ref Precision 4.096V 5mA 5-Pin SOT-23 T/R 制造商:Analog Devices 功能描述:V-REF PRECISION 4.096V 5MA 5PIN SOT-23 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:PREC LOW DRIFT+4.096V REF - Tape and Reel |
| ADR392ART-RL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
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