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TL431A View Datasheet(PDF) - Analog Intergrations

Part Name
Description
View to exact match
TL431A
AIC
Analog Intergrations AIC
TL431A Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
AIC431/TL431A/TL431
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
Minimum Cathode current for
Regulation
Off-State Current
Dynamic Output Impedance
(Note 4)
TEST CONDITIONS
VZ=VREF (Fig. 1)
VZ=20V, VREF =0V (Fig. 3)
VZ=VREF
Frequency= 0Hz (Fig. 1)
SYMBOL
IZ(MIN)
MIN.
TYP. MAX. UNIT
0.25 0.5 mA
IZ(OFF)
RZ
0.1
1.0
µA
0.08 0.3
VMAX
VMIN
VDEV = VMAX-VMIN
T1
TEMPERATURE
T2
Note 3. Deviation of reference input voltage, VDEV, 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, αVREF is d efined as:
VREF ppm
=
±
VMAX-
VREF(at
VMIN
25°C)
106
=
±
VDEV
VREF(at 25°C)
106
°C
T2 T1
T2 T1
Where:
T2T1=full temperature change.
αVREF can be positive or negative depending on
whether the slope is positive or negative.
Example: VDEV= 9.0mV, VREF= 2495mV,
T2T1= 70°C, slope is negative.
αVREF
=
9.0mV
 2495mV

106
=
50ppm/°C
70°C
Note 4. The dynamic output impedance, Rz, is de-
fined as:
RZ
=
VZ
IZ
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:
[ ] rz = Vz Rz 1+R1
Iz
R2
n TYPICAL PERFORMANCE CHARACTERISTICS
Cathode Current vs Cathode Voltage
1000
800
VZ =VREF
TA =25°C
600
IZ(MIN)
400
200
0
-200
-400
-600
-1.0 -0.5 0.0
0.5
1.0
1.5
2.0
2.5
3.0
Cathode Voltage (V)
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
2.40-40
Reference Voltage vs Temperature
VZ =VREF
IZ =10mA
VREF =2.535V
VREF =2.495V
VREF=2.455V
-20
0
20
40
60
80
100
120
Temperature (°C )
5
 

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