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TL431 Datasheet(PDF) 5 Page - Analog Intergrations Corporation

Part # TL431
Description  Adjustable Precision Shunt Regulators
PDF  11 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

TL431 Datasheet(HTML) 5 Page - Analog Intergrations Corporation

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AIC431/TL431A/TL431
5
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Minimum Cathode current for
Regulation
VZ=VREF (Fig. 1)
IZ(MIN)
0.25
0.5
mA
Off-State Current
VZ=20V, VREF =0V (Fig. 3)
IZ(OFF)
0.1
1.0
µA
Dynamic Output Impedance
(Note 4)
VZ=VREF
Frequency= 0Hz (Fig. 1)
RZ
0.08
0.3
Ω
T2
T1
VMAX
VDEV = VMAX-VMIN
VMIN
TEMPERATURE
Note 3. Deviation of reference input voltage, V
DEV, is de-
fined as the maximum variation of the reference input
voltage over the full temperature range.
The average temperature coefficient of the reference in-
put voltage,
αV
REF is d efined as:
T1
T2
10
C)
25
(at
V
V
T1
T2
6
10
C)
25
(at
V
V
-
V
C
ppm
V
6
REF
DEV
REF
MIN
MAX
REF
−
°
±
=
−
°
±
=
°
∆
Where:
T2−T1=full temperature change.
αV
REF
can be positive or negative depending on
whether the slope is positive or negative.
Example: VDEV= 9.0mV, VREF= 2495mV,
T2−T1= 70°C, slope is negative.
C
50ppm/
V
C
70
6
10
2495mV
9.0mV
REF
°
−
=


=
°
α
Note 4. The dynamic output impedance, Rz, is de-
fined as:
RZ =
Z
Z
V
I
∆
∆
When the device is programmed with two external re-
sistors, R1 and R2, (see Fig. 2), the dynamic output
impedance of the overall circuit, is defined as:
[ ]
R2
R1
1
Rz
Iz
Vz
z
r
+
≅
∆
∆
=
n TYPICAL PERFORMANCE CHARACTERISTICS
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-600
-400
-200
0
200
400
600
800
1000
IZ(MIN)
VZ =VREF
TA =25°C
Cathode Current vs Cathode Voltage
Cathode Voltage (V)
-40
-20
0
20
40
60
80
100
120
2.40
2.42
2.44
2.46
2.48
2.50
2.52
2.54
2.56
2.58
Reference Voltage vs Temperature
VZ =VREF
IZ =10mA
Temperature (°C)
VREF=2.535V
VREF=2.495V
VREF=2.455V



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