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ADP3301AR-3.2 bảng dữ liệu(PDF) 7 Page - Analog Devices

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ADP3301AR-3.2 bảng dữ liệu(HTML) 7 Page - Analog Devices

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ADP3301
–7–
REV. 0
It is not recommended to use solder mask or silkscreen on the
PCB traces adjacent to the ADP3301’s pins since it will increase
the junction to ambient thermal resistance of the package.
Shutdown Mode
Applying a TTL high signal to the shutdown pin, or tying it to
the input pin, will turn the output ON. Pulling the shutdown
pin low, or tying it to ground, will turn the output OFF. In
shutdown mode, quiescent current is reduced to less than 1
µA.
Error Flag Dropout Detector
The ADP3301 will maintain its output voltage over a wide
range of load, input voltage and temperature conditions. If, for
example, regulation is lost by reducing the supply voltage below
the combined regulated output and dropout voltages, the ERRor
flag will be activated. The ERR output is an open collector,
which will be driven low.
Once set, the ERRor flag’s hysteresis will keep the output low
until a small margin of operating range is restored either by
raising the supply voltage or reducing the load.
APPLICATION CIRCUITS
Crossover Switch
The circuit in Figure 21 shows that two ADP3301s can be used
to form a mixed supply voltage system. The output switches
between two different levels selected by an external digital input.
Output voltages can be any combination of voltages from the
Ordering Guide.
Higher Output Current
The ADP3301 can source up to 100 mA without any heatsink
or pass transistor. If higher current is needed, an appropriate
pass transistor can be used, as in Figure 22, to increase the
output current to 1 A.
Step-Up/Step-Down Post Regulator
The circuit in Figure 23 provides a high precision, low dropout
regulated output voltage. It significantly reduces the ripple from
a switching regulator. The ADP3000 used in this circuit is a
switching regulator in the step-up configuration.
D1
1N5817
C2
100µF
10V
L1
6.8µH
R1
120
R2
19.6k
1%
R3
10k
1%
ADP3301-3.3
IN
OUT
GND
C3
2.2µF
3.3V @ 100mA
C1
100µF
10V
ADP3000-ADJ
ILIM
VIN
SW1
GND
SW2
FB
VIN = 2.5V TO 3.5V
Figure 23. Step-Up/Step-Down Post Regulator
VOUT = 5V/3.3V
VIN = 5.5V TO 12V
OUTPUT SELECT
5V
0V
C2
0.47µF
IN
OUT
GND
SD
ADP3301-5.0
+
+
IN
OUT
GND
SD
ADP3301-3.3
C1
1.0µF
Figure 21. Crossover Switch
VIN = 6V TO 8V
VOUT = 5V @ 1A
MJE253*
C2
10µF
C1
47µF
R1
50
*AAVID531002 HEAT SINK IS USED
IN
OUT
ERR
GND
SD
ADP3301-5
Figure 22. High Output Current Linear Regulator


Số phần tương tự - ADP3301AR-3.2

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Analog Devices
ADP3301AR-3.2 AD-ADP3301AR-3.2 Datasheet
84Kb / 8P
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Mô tả tương tự - ADP3301AR-3.2

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