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TL431B 数据表(PDF) 3 Page - KEC(Korea Electronics)

部件名 TL431B
功能描述  BIPOLAR LINEAR INTEGRATED CIRCUIT
Download  6 Pages
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制造商  KEC [KEC(Korea Electronics)]
网页  http://www.keccorp.com
标志 KEC - KEC(Korea Electronics)

TL431B 数据表(HTML) 3 Page - KEC(Korea Electronics)

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2008. 7. 3
3/6
TL431 Series
Revision No : 0
Input
FIGURE 1-TEST CIRCUIT FOR VKA = Vref
off
I
KA
V
Input
FIGURE 3-TEST CIRCUIT FOR I off
FIGURE 2-TEST CIRCUIT FOR VKA > Vref
IK
IK
VKA
VKA
Input
R1
R2
Iref
VKA = Vref ( 1+
) + Iref R1
R1
R2
Max.
Min.
T1
T2
AMBIENT TEMPERATURE
-
Vref (Min.)
Ta = T2 - T1
Vref
Vref
Vref
Vref = Vref (Max.)
Vref
Example :
Vref = 8.0mV and slope is positive,
Vref at 25 =2.495V,
Ta=70
0.008
10
6
Vref =
= 45.8 ppm/
70
(2.495)
Note 2: The dynamic impedance Zka is defined as:
VKA
|Zka| =
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
Note 1:
The deviation parameter
Vref is defined as the differences
between the maximum and minimum values obtained over the
full operating ambient temperature range that applies.
The average temperature coefficient of the Reference
input voltage,
Vref , is defined as:
Vref
(
)
10
6
ppm
Vref at 25
Vref (
) =
Ta
Vref
10
6
=
Ta(Vref at 25 )
Vref can be positive or negative depending on whether
Vref Min. or Vref Max. occurs at the lower ambient temperature.


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