SPX4041N 데이터 시트보기 (PDF) - Signal Processing Technologies
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SPX4041N Datasheet PDF : 9 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
VIN
180Ω
fp = 100kHz
50Ω
VOUT
IK
Figure 9. Frequency=100kHz, IK=10mA, TA=25°C
GND
Figure 10. Test Circuit for Pulse Response
This device is designed for stable opera-
tion and has no need of an external
capacitor. The reference remains stable if
a bypass capacitor is used.
SOT-23
The SPX4041 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 applica-
tion (see Figure 11), an external series
resister (R ) is connected between the
S
supply voltage and the SPX4041. RS
determines the current that flows through
the load (IL) and the reference (IQ). Since
VS
RS IQ + IL
VR
IL
IQ
SPX4041
VOUT
APPLICATION INFORMATION
load current and supply voltage may vary,
RS should be small enough to supply at
least the minimum acceptable IQ 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 is at its
L
minimum, RS should be large enough so
that the current flowing through the
SPX4041 is less than 15mA.
RS is determined by the supply voltage
(VS), the load and operating current (IL and
IQ), reference’s reverse breakdown voltage
(VR).
RS = (VS - VR)/(IL+IQ)
VIN
3k
VOUT
SPX4041
Figure 11. SPX4041 Fixed Shunt Regulator
Figure 12 1.24V Reference Circuit
Date: 11/29/04
SPX4041 Precision 1.24V Shunt Voltage Reference
4
© Copyright 2004 Sipex Corporation
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