TL431_432 Datasheet, PDF (3/14 Pages) Diodes Incorporated – ADJUSTABLE PRECISION SHUNT REGULATOR

TL431/TL432
ADJUSTABLE PRECISION SHUNT REGULATOR
Electrical Characteristics (T_A = +25°C, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ. Max
V_REF Reference voltage
V_KA = V_REF,
I_KA = 10mA
V_DEV
Deviation of reference voltage over ^VKA ^{= V}REF^,
full temperature range (Note 5)
I_KA = 10mA
ΔV_REF
ΔV_KA
Ratio of the change in reference
voltage to the change in cathode
voltage
I_KA = 10mA
TL431A
TL431B
T_A = 0 to 70 ^oC
T_A = -40 to 85 ^oC
T_A = -40 to 125 ^oC
V_KA = 10V to V_REF
V_KA = 36V to 10V
2.470
2.482
2.495
2.495
6
14
14
-1.4
-1
2.520
2.507
16
34
34
-2.7
-2
I_REF
ΔI_REF
Reference input current
I_REF deviation over full temperature
range (Note 5)
I_KA = 10mA, R1 = 10KΩ, R2 = ∞
T_A = 0 to 70 ^oC
I_KA = 10mA, R1 =
10KΩ, R2 = ∞
T_A = -40
to 85 ^oC
T_A = -40 to 125 ^oC
1
4
0.8
1.2
0.8
2.5
0.8
2.5
I_KA(MIN)
Minimum cathode current for
regulation
V_KA = V_REF
0.4
0.7
I_KA(OFF) Off-state current
V_KA = 36V, V_REF = 0V
0.05 0.5
|Z_KA|
θ_JA
Dynamic output impedance (Note 6) V_KA = V_REF, f = 0Hz
Thermal Resistance Junction to
Ambient
SOT23
SOT25
0.2
0.5
380
250
Notes: 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
X 10⁶
αV_REF
=
V_REF @ 25ºC
T2 – T1
ppm/ºC
Where:
T2 – T1 = full temperature change.
Vmin
αVREF can be positive or negative depending on whether the slope is
positive or negative.
V_DEV = Vmax - Vmin
Notes: 6. The dynamic output impedance, RZ, is defined as:
Z_KA
=
ΔV_KA
ΔI_KA
T1
When the device is programmed with two external resistors R1 and R2, the dynamic output
impedance of the overall circuit, is defined as:
Temperature
Unit
V
V
mV
mV
mV
mV/V
mV/V
μA
μA
μA
μA
mA
μA
Ω
o_C/W
o_C/W
T2
ΔV
Z’ =
ΔI
≈ Z_KA
1 + ^R1
R2
TL431/432
Document number: DS35050 Rev. 2 - 2
3 of 14
www.diodes.com
September 2010
© Diodes Incorporated