TL431/TL432
ADJUSTABLE PRECISION SHUNT REGULATOR
Electrical Characteristics
(T
A
= +25°C, unless otherwise noted)
Symbol
V
REF
Parameter
Reference voltage
Test Conditions
V
KA
= V
REF
,
I
KA
= 10mA
V
KA
= V
REF
,
I
KA
= 10mA
TL431A
TL431B
T
A
= 0 to 70 C
V
DEV
Deviation of reference voltage over
full temperature range (Note 5)
Ratio of the change in reference
voltage to the change in cathode
voltage
Reference input current
I
REF
deviation over full temperature
range (Note 5)
Minimum cathode current for
regulation
Off-state current
T
A
= -40 to 85
o
C
T
A
= -40 to 125
o
C
V
KA
= 10V to V
REF
I
KA
= 10mA
V
KA
= 36V to 10V
o
Min
2.470
2.482
Typ.
2.495
2.495
6
14
14
-1.4
-1
1
0.8
0.8
0.8
0.4
0.05
0.2
380
250
Max
2.520
2.507
16
34
34
-2.7
-2
4
1.2
2.5
2.5
0.7
0.5
0.5
Unit
V
V
mV
mV
mV
mV/V
mV/V
μA
μA
μA
μA
mA
μA
Ω
o
o
NEW PRODUCT
ΔV
REF
ΔV
KA
I
REF
ΔI
REF
I
KA
= 10mA, R1 = 10KΩ, R2 =
∞
T
A
= 0 to 70
o
C
I
KA
= 10mA, R1 =
T
A
= -40 to 85
o
C
10KΩ, R2 =
∞
T
A
= -40 to 125
o
C
V
KA
= V
REF
V
KA
= 36V, V
REF
= 0V
I
KA(MIN)
I
KA(OFF)
|Z
KA
|
θ
JA
Notes:
Dynamic output impedance (Note 6) V
KA
= V
REF,
f = 0Hz
Thermal Resistance Junction to
Ambient
SOT23
SOT25
C/W
C/W
5. Deviation of V
DEV
, and
ΔI
REF
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:
Vmax
V
DEV
αV
REF
=
V
REF
@ 25ºC
T2 – T1
X 10
6
ppm/ºC
Vmin
Where:
T2 – T1 = full temperature change.
αV
REF
can be positive or negative depending on whether the slope is
positive or negative.
Notes: 6. The dynamic output impedance, R
Z
, is defined as:
V
DEV
= Vmax - Vmin
Z
KA
=
ΔV
KA
ΔI
KA
T1
Temperature
T2
When the device is programmed with two external resistors R1 and R2, the dynamic output
impedance of the overall circuit, is defined as:
Z’ =
ΔV
ΔI
≈
Z
KA
1+
R1
R2
TL431/432
Document number: DS35050 Rev. 2 - 2
3 of 14
September 2010
© Diodes Incorporated
DIODES [ DIODES INCORPORATED ]
