Datasheet

TL431, A, B Series
4
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (T
A
= 25°C, unless otherwise noted.)
Ch i i
Sbl
TL431AI TL431AC TL431B
Characteristic Symbol
Min Typ Max Min Typ Max Min Typ Max Unit
Reference Input Voltage (Figure 1) V
ref
V
V
KA
= V
ref
, I
K
= 10 mA
T
A
= 25°C 2.47 2.495 2.52 2.47 2.495 2.52 2.483 2.495 2.507
T
A
= T
low
to T
high
2.44 – 2.55 2.453 – 2.537 2.475 2.495 2.515
Reference Input Voltage Deviation Over ∆V
ref
– 7.0 – – 3.0 – – 3.0 – mV
Temperature Range (Figure 1, Notes 1, 2)
V
KA
= V
ref,
I
K
= 10 mA
Ratio of Change in Reference Input Voltage
V
ref
mV/V
to Change in Cathode to Anode Voltage
ref
V
KA
I
K
= 10 mA (Figure 2),
V
KA
∆V
KA
= 10 V to V
ref
– –1.4 –2.7 – –1.4 –2.7 – –1.4 –2.7
∆V
KA
= 36 V to 10 V – –1.0 –2.0 – –1.0 –2.0 – –1.0 –2.0
Reference Input Current (Figure 2) ∆I
ref
µA
I
K
= 10 mA, R1 = 10 k, R2 = ∞
T
A
= 25°C – 1.8 4.0 – 1.8 4.0 – 1.1 2.0
T
A
= T
low
to T
high
(Note 1) – – 6.5 – – 5.2 – – 4.0
Reference Input Current Deviation Over ∆I
ref
– 0.8 2.5 – 0.4 1.2 – 0.4 1.2 µA
Temperature Range (Figure 2, Note 1)
I
K
= 10 mA, R1 = 10 k, R2 = ∞
Minimum Cathode Current For Regulation I
min
– 0.5 1.0 – 0.5 1.0 – 0.5 1.0 mA
V
KA
= V
ref
(Figure 1)
Off–State Cathode Current (Figure 3) I
off
– 260 1000 – 260 1000 – 230 500 nA
V
KA
= 36 V, V
ref
= 0 V
Dynamic Impedance (Figure 1, Note 3) |Z
KA
| – 0.22 0.5 – 0.22 0.5 – 0.14 0.3 Ω
V
KA
= V
ref
, ∆I
K
= 1.0 mA to 100 mA
f ≤ 1.0 kHz
NOTES: 1. T
low
= –40°C for TL431AIP TL431AILP, TL431IP, TL431ILP, TL431BID, TL431BIP, TL431BILP, TL431AIDM, TL431IDM, TL431BIDM
=0°C for TL431ACP, TL431ACLP, TL431CP, TL431CLP, TL431CD, TL431ACD, TL431BCD, TL431BCP, TL431BCLP, TL431CDM,
TL431ACDM, TL431BCDM
T
high
= +85°C for TL431AIP, TL431AILP, TL431IP, TL431ILP, TL431BID, TL431BIP, TL431BILP, TL431IDM, TL431AIDM, TL431BIDM
= +70°C for TL431ACP, TL431ACLP, TL431CP, TL431ACD, TL431BCD, TL431BCP, TL431BCLP, TL431CDM, TL431ACDM, TL431BCDM
2. The deviation parameter ∆V
ref
is defined as the difference between the maximum and minimum values obtained over the full operating ambient
temperature range that applies.
∆ V
ref
= V
ref
max
–V
ref
min
∆ T
A
= T
2
– T
1
T2
Ambient Temperature
T1
V
ref
min
V
ref
max
The average temperature coefficient of the reference input voltage, αV
ref
is defined as:
V
ref
ppm
C
V
ref
V
ref
@25 C
X10
6
T
A
V
ref
x10
6
T
A
(V
ref
@25C)
αV
ref
can be positive or negative depending on whether V
ref
Min or V
ref
Max occurs at the lower ambient temperature. (Refer to Figure 6.)
Example : V
ref
8.0 mV and slope is positive,
V
ref
@25C 2.495 V, T
A
70 C
V
ref
0.008 x 10
6
70 (2.495)
45.8 ppm C
3. The dynamic impedance Z
KA
is defined as
|Z
KA
|
V
KA
I
K
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:
|Z
KA
| |Z
KA
| 1
R1
R2