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PDF PJ431 Fiche technique ( Data sheet )

Numéro de référence PJ431
Description (PJ431x) Programmable Precision References
Fabricant Promax-Johnton 
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PJ431 Datasheet, Description
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PJ431/PJ431A/PJ431B
Programmable Precision References
The PJ431, A, B integrated circuits are three-terminal
programmable shunt regulator diodes. These monolithic
IC voltage references operate as a low temperature coefficient
zener which is programmable from Vref to 36 volts with two
external resistors. These devices exhibit a wide operating
current range of 1.0 to 100mA with a typical dynamic
impedance of 0.22. The characteristics of these
references make them excellent replacements for zener
FEATURES
Programmable Output Voltage to 36 Volts
Voltage Reference Tolerance:
PJ431A : ±0.5%, Typ@25°C
PJ431 : ±1%, Typ@25°C
PJ431B : ±2%, Typ@25°C
Low Dynamic Output Impedance, 0.22 Typical
Sink Current Capability of 1.0 to 100 mA
Equivalent Full-Range Temperature Coefficient of 50
ppm/ Typical
Temperature Compensated for Operation over Full Rated
Operating Temperature Range
Low Output Noise Voltage
BLOCK DIAGRAM
diodes in many applications such as digital voltmeters, power
supplies , and op amp circuitry. The 2.5 volt reference makes
it convenient to obtain a stable reference from 5.0 volt logic
supplies, and since The PJ431, A, B operates as a shunt
regulator, it can be used as either a positive or negative tage
reference.
TO-92
SOT-89
Pin: 1. Reference
2. Anode
3. Cathode
SOT-23
Pin: 1. Reference
2. Cathode
3. Anode
Pin: 1. Reference
2. Anode
3. Cathode
(Heatsink surface
connected to Pin 2)
SOP-8
Pin: 1. Cathode
2. Anode
3. Anode
4. N.C.
5. N.C.
6. Anode
7. Anode
8. Reference
SOP-8 is an internally modified SOP-8 Package. Pins 2,3,6
and 7 are electrically common to the die attach flag. This
internal lead frame modification decreases package thermal
resistance and increases power dissipation capability when
appropriately mounted on a printed on a printed circuit board.
SOP-8 conforms to all external dimensions of the standard
SOP-8 Package.
CIRCUIT SCHEMATIC
QRDERING INFORMATION
Device
PJ431/ A/ B CT
PJ431/ A/ B CS
PJ431/ A/ B CY
PJ431/ A/ B CX
Operating Temperature
(Ambient)
- 20~ +85
Package
TO-92
SOP-8
SOT-89
SOT-23
1-11 2003/01 rev.A
PJ431 Fiche technique
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PJ431/PJ431A/PJ431B
Programmable Precision References
1
Tlow =-20 , Thigh = +85
2
The deviation parameter Vref is defined as the
differences between the maximum and minimum values
obtained over the full operating ambient temperature range
the applies.
FIGURE 1 -- TEST CIRCUIT FOR VKA = vref
The average temperature coefficient of the reference input
voltage, α Vref , is defined as :
ppm
αVref
=
(vref )
Vref@25
TA
x106
=
Vref x 106
TA(Vref@25 )
αVref can be positive of negative depending on whether
Vref Min of Vref Max occurs at the lower ambient temperature.
(Refer to Figure 6)
Example: Vref = 8.0 mV and slope is positive,
Vref @ 25 = 2.5V, TA = 85
0.008 × 106
α Vref =
= 45.8 ppm/
70(2.5)
3
The dynamic impedance Zka is defined as:
| Zka | =
VKA
IK
When the device is programmed with two external
resistors, R1 and R2, (refer to Figure 2) the total dynamic
impedance of the circuit is defined as:
R1
| Zka | | Zka | ( 1 +
R2
)
FIGURE 2 -- TEST CIRCUIT FOR VKA > Vref
R1
VKA = Vref ( 1+
R2
) + Iref R1
FIGURE 3 -- TEST CIRCUIT FOR Ioff
4
This test is not applicable to surface mount (D suffix) devices.
3-11 2003/01 rev.A

3 Page

PJ431 pdf
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PJ431/PJ431A/PJ431B
Programmable Precision References
FIGURE 10 - DYNAMIC IMPEDANCE
VERSUS FREQUENCY
FIGURE 11 - DYNAMIC IMPEDANCE VERSUS
AMBIENT TEMPERATURE
FIGURE 12 - OPEN LOOP VOLTAGE GAIN VERSUS
FREQUENCY
FIGURE 13 - SPECTRAL NOISE DENSITY
FIGURE 14 - PULSE RESPONSE
FIGURE 15 - STABILITY BOUNDARY CONDITIONS
6-11 2003/01 rev.A

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