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SPX4041 Fiches technique(PDF) 4 Page - Sipex Corporation

No de pièce SPX4041
Description  Precision 1.24V Shunt Voltage Reference
Download  9 Pages
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX4041 Fiches technique(HTML) 4 Page - Sipex Corporation

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Date: 11/29/04
SPX4041 Precision 1.24V Shunt Voltage Reference
© Copyright 2004 Sipex Corporation
4
Figure 9. Frequency=100kHz, I
K=10mA, TA=25°C
Figure 10. Test Circuit for Pulse Response
GND
VOUT
50Ω
fp = 100kHz
180Ω
VIN
IK
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
S) is connected between the
supply voltage and the SPX4041. 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
SPX4041 is less than 15mA.
R
S is determined by the supply voltage
(V
S), the load and operating current (IL and
I
Q), reference’s reverse breakdown voltage
(V
R).
R
S = (VS - VR)/(IL+IQ)
Figure 11. SPX4041 Fixed Shunt Regulator
Figure 12 1.24V Reference Circuit
VS
IQ + IL
SPX4041
VOUT
IL
IQ
VR
RS
3k
VIN
SPX4041
VOUT
TYPICAL PERFORMANCE CHARACTERISTICS
APPLICATION INFORMATION


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