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TL431 Datasheet(PDF) 3 Page - Diodes Incorporated

Part # TL431
Description  ADJUSTABLE PRECISION SHUNT REGULATOR
PDF  14 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

TL431 Datasheet(HTML) 3 Page - Diodes Incorporated

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TL431/TL432
ADJUSTABLE PRECISION SHUNT REGULATOR
TL431/432
Document number: DS35050 Rev. 2 - 2
3 of 14
www.diodes.com
September 2010
© Diodes Incorporated
Electrical Characteristics (TA = +25°C, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
Typ.
Max
Unit
VREF
Reference voltage
VKA = VREF,
IKA = 10mA
TL431A
2.470
2.495
2.520
V
TL431B
2.482
2.495
2.507
V
VDEV
Deviation of reference voltage over
full temperature range (Note 5)
VKA = VREF,
IKA = 10mA
TA = 0 to 70
oC
6
16
mV
TA = -40 to 85
oC
14
34
mV
TA = -40 to 125
oC
14
34
mV
ΔVREF
ΔVKA
Ratio of the change in reference
voltage to the change in cathode
voltage
IKA = 10mA
VKA = 10V to VREF
-1.4
-2.7
mV/V
VKA = 36V to 10V
-1
-2
mV/V
IREF
Reference input current
IKA = 10mA, R1 = 10KΩ, R2 = ∞
1
4
μA
ΔIREF
IREF deviation over full temperature
range (Note 5)
IKA = 10mA, R1 =
10K
Ω, R2 = ∞
TA = 0 to 70
oC
0.8
1.2
μA
TA = -40 to 85
oC
0.8
2.5
μA
TA = -40 to 125
oC
0.8
2.5
μA
IKA(MIN)
Minimum cathode current for
regulation
VKA = VREF
0.4
0.7
mA
IKA(OFF)
Off-state current
VKA = 36V, VREF = 0V
0.05
0.5
μA
|Z
KA|
Dynamic output impedance (Note 6) VKA = VREF, f = 0Hz
0.2
0.5
Ω
θJA
Thermal Resistance Junction to
Ambient
SOT23
380
oC/W
SOT25
250
oC/W
Notes:
5. Deviation of VDEV, and ΔIREF are defined as the maximum variation of the values over the full temperature range.
The average temperature coefficient of the reference input voltage
αV
REF is defined as:
Where:
T2 – T1 = full temperature change.
αVREF can be positive or negative depending on whether the slope is
positive or negative.
Notes: 6. The dynamic output impedance, RZ, is defined as:
When the device is programmed with two external resistors R1 and R2, the dynamic output
impedance of the overall circuit, is defined as:
=
T2 – T1
αV
REF
V
DEV
V
REF @ 25ºC
X 10
6
ppm/ºC
=
T2 – T1
αV
REF
V
DEV
V
REF @ 25ºC
X 10
6
ppm/ºC
Vmax
Vmin
T1
T2
V
DEV = Vmax - Vmin
Temperature
Vmax
Vmin
T1
T2
V
DEV = Vmax - Vmin
Temperature
=
Z
KA
ΔV
KA
ΔI
KA
=
Z
KA
ΔV
KA
ΔI
KA
=
Z’
ΔV
ΔI
Z
KA
1 +
R1
R2
≈
=
Z’
ΔV
ΔI
=
Z’
ΔV
ΔI
Z
KA
1 +
R1
R2
Z
KA
1 +
R1
R2
≈



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