參數(shù)資料
型號： TL431CPSE4
廠商： TEXAS INSTRUMENTS INC
元件分類： 基準電壓源/電流源
英文描述： 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.495 V, PDSO8
封裝： PLASTIC, SO-8
文件頁數(shù)： 19/24頁
文件大?。?/td> 386K
代理商： TL431CPSE4
TL431, TL431A
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS005M – JULY 1978 – REVISED OCTOBER 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
PARAMETER
TEST
TEST CONDITIONS
TL431C
UNIT
PARAMETER
CIRCUIT
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Vref
Reference voltage
2
VKA = Vref,
IKA = 10 mA
2440
2495
2550
mV
VI(dev)
Deviation of reference voltage
over full temperature range
(see Figure 1)
2
VKA = Vref, IKA = 10 mA,
TA = 0°C to 70°C
4
25
mV
DV
ref
Ratio of change in reference voltage
3
IKA =10mA
VKA = 10 V – Vref
–1.4
–2.7
mV
ref
DV
KA
gg
to the change in cathode voltage
3
IKA = 10 mA
VKA = 36 V – 10 V
–1
–2
mV
V
Iref
Reference current
3
IKA = 10 mA, R1 = 10 k, R2 = ∞
2
4
A
II(dev)
Deviation of reference current
over full temperature range
(see Figure 1)
3
IKA = 10 mA, R1 = 10 k, R2 = ∞,
TA = 0°C to 70°C
0.4
1.2
A
Imin
Minimum cathode current
for regulation
2
VKA = Vref
0.4
1
mA
Ioff
Off-state cathode current
4
VKA = 36 V,
Vref = 0
0.1
1
A
|zKA|
Dynamic impedance (see Figure 1)
1
IKA = 1 mA to 100 mA, VKA = Vref,
f
≤ 1 kHz
0.2
0.5
The deviation parameters Vref(dev) and Iref(dev) are defined as the differences between the maximum and minimum
values obtained over the recommended temperature range. The average full-range temperature coefficient of the
reference voltage,
αVref, is defined as:
where:
TA is the recommended operating free-air temperature range of the device.
αVref can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the
lower temperature.
Example: maximum Vref = 2496 mV at 30°C, minimum Vref = 2492 mV at 0°C, Vref = 2495 mV at 25°C,
TA = 70°C for TL431C
Because minimum Vref occurs at the lower temperature, the coefficient is positive.
Calculating Dynamic Impedance
The dynamic impedance is defined as:
When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit
is given by:
Maximum Vref
Minimum Vref
TA
VI(dev)
a
Vref
ppm
°C +
V
I(dev)
V
ref
at 25
°C
106
DT
A
a
Vref +
4mV
2495 mV
106
70
°C
[ 23 ppm °C
z
KA +
DV
KA
DI
KA
|z |
+ DV
DI [
z
KA
1
) R1
R2
Figure 1. Calculating Deviation Parameters and Dynamic Impedance
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TL431CPWE4 功能描述:基準電壓& 基準電流 Adjustable Precision Shunt Regulator RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel
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