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SPX4040 数据表(PDF) 4 Page - Sipex Corporation

部件名 SPX4040
功能描述  Precision Micropower 2.5V ShuntVoltage Reference
Download  9 Pages
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制造商  SIPEX [Sipex Corporation]
网页  http://www.sipex.com
标志 SIPEX - Sipex Corporation

SPX4040 数据表(HTML) 4 Page - Sipex Corporation

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Date: 1/19/05
SPX4040 Micropower 2.5V Shunt Voltage Reference
© Copyright 2005 Sipex Corporation
Figure 10. Off State Leakage
IK
VOUT
GND
250Ω
50Ω
VIN
fp = 100kHz
Figure 8. Test Circuit for Pulse Response
T
A =25 °C
I
K =1 to 15mA
f Frequency (Hz)
100
10
1.0
0.1
0.01
1K
10K
100K
1M
10M
Figure 9. Dynamic Output Impedance T
A = 25°C,
I
K = 1 to 15mA
0.01
0.1
1
10
100
-50
0
50
100
150
TA Ambient Temperature (°C)
VKA = 2.5V
APPLICATION INFORMATION
This device is designed for stable operation and
has no need of an external capacitor between
pins 4 and 8. The reference remains stable if a
bypass capacitor is used.
SOT-23
The SPX4040 in the SOT-23 package has a
parasitic Schottky diode between pin 3 and pin
1. Pin 1 of SOT-23 must float or be connected
to pin 3.
Conventional Shunt Regulator
In a conventional shunt regulator application
(see Figure 11), an external series resistor (R
S) is
connected between the supply voltage and the
SPX4040. R
S determines the current that flows
through the load (I
L) and the reference (IQ).
Since load current and supply voltage may vary,
R
S should be small enough to supply at least the
minimum acceptable I
Q to the reference even
when the supply voltage is at its minimum and
the load current is at its maximum value. When
the supply voltage is at its maximum and I
L is at
its minimum, R
S should be large enough so that
the current flowing through the SPX4040 is less
than 15mA.
R
S is determined by the supply voltage (VS), the
load and operating current (I
L and IQ), reference's
reverse breakdown voltage (V
R).
R
S = (VS-VR)/(IL+IQ)
TYPICAL PERFORMANCE CHARACTERISTICS


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