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TS1431ACX RFG

P1-P3P4-P6P7-P9P10-P10
TS1431
Adjustable Precision Shunt Regulator
Document Number: DS_P0000229
1
Version: E15
SOT
-
23
General Description
TS1431 series integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage
references operate as a low temperature coefficient zener which is programmable from V
REF
to 36 volts with two
external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic
impedance of 0.22Ω. The characteristics of these references make them excellent replacements for zener diodes in
many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5V reference makes it
convenient to obtain a stable reference from 5.0V logic supplies, and since The TS1431 series operates as a shunt
regulator, it can be used as either a positive or negative stage reference.
Features
Precision Reference Voltage
TS1431A – 2.495V±1%
TS1431B – 2.495V±0.5%
Equivalent Full Range Temp. Coefficient: 50ppm/ ºC
Programmable Output Voltage up to 36V
Fast Turn-On Response
Sink Current Capability of 1~100mA
Low Dynamic Output Impedance: 0.2
Low Output Noise
Ordering Information
Part No. Package Packing
TS1431xCX RFG SOT-23 3,000pcs / 7” Reel
Note: “G” denote for Green Product
Where xx denotes voltage tolerance
A: ±1%, B: ±0.5%
Application
Voltage Monitor
Delay Timmer
Constant –Current Source/Sink
High-Current Shunt Regulator
Crow Bar
Over-Voltage / Under-Voltage Protection
Block Diagram
Absolute Maximum Ratings
(T
A
= 25
o
C unless otherwise noted)
Parameter Symbol Limit Unit
Cathode Voltage V
KA
36 V
Continuous Cathode Current Range I
KA
1 ~ +100 mA
Reference Input Current Range I
REF
-0.05 ~ +10 mA
Power Dissipation P
D
0.30 W
Junction Temperature T
J
+150
o
C
Operating Temperature Range T
OPR
0 ~ +70
o
C
Storage Temperature Range T
STG
-65 ~ +150
o
C
Pin
:
1. Cathode
2. Reference
3. Anode
TS1431
Adjustable Precision Shunt Regulator
Document Number: DS_P0000229
2
Version: E15
Recommended Operating Condition
Parameter Symbol Limit Unit
Cathode Voltage
(Note 1)
V
KA
Ref ~ 36 V
Continuous Cathode Current Range I
K
1 ~ 100 mA
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
Reference voltage
TS1431A
V
REF
V
KA
=V
REF
, I
K
=10mA (Figure 1)
T
A
=25
o
C
2.475
2.495
2.525
V
TS1431B 2.487
2.513
Deviation of reference input
voltage
V
REF
V
KA
= V
REF
, I
K
=10mA (Figure 1)
T
A
= full range
-- 3 17 mV
Radio of change in Vref to
change in cathode Voltage
V
REF
/V
KA
I
KA
=10mA, V
KA
= 10V to V
REF
V
KA
= 36V to 10V (Figure 2)
--
--
-1.4
-1.0
-2.7
-2.0
mV/V
Reference Input current I
REF
R1=10K, R2=
∞
, I
KA
=10mA
T
A
= full range (Figure 2)
-- 0.7 4.0 µA
Deviation of reference input
current, over temp.
I
REF
R1=10K, R2=
∞
, I
KA
=10mA
T
A
= full range (Figure 2)
-- 0.4 1.2 µA
Off-state Cathode Current I
KA
(off)
V
REF
=0V (Figure 3),
V
KA
=36V
-- -- 1.0 µA
Dynamic Output Impedance | Z
KA
|
f<1KHz, V
KA
= V
REF
I
KA
=1mA to 100mA (Figure 1)
-- 0.22 0.5
Minimum operating cathode
current
I
KA
(min) V
KA
= V
REF
(Figure 1) -- 0.4 0.6 mA
* The deviation parameters V
REF
and I
REF
are defined as difference between the maximum value and minimum value
obtained over the full operating ambient temperature range that applied.
* The average temperature coefficient of the
reference input voltage, αV
REF
is defined as:
Where: T2-T1 = full temperature change.
αV
REF
can be positive or negative depending on whether the slope is positive or negative.
Example: Maximum V
REF
=2.496V at 30
o
C, minimum V
REF
=2.492V at 0
o
C, V
REF
=2.495V at 25
o
C, T=70
o
C
αV
REF
| = [4mV / 2495mV] * 10
6
/ 70
o
C ≈ 23ppm/
o
C
Because minimum V
REF
occurs at the lower temperature, the coefficient is positive.
* The dynamic impedance Z
KA
is defined as:
| Z
KA
| = ∆V
KA
/ ∆I
KA
* When the device operating with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of
the circuit is given by:
| Z
KA
| = ∆v / ∆i | ≈ Z
KA
| * ( 1 + R1 / R2)
TS1431
Adjustable Precision Shunt Regulator
Document Number: DS_P0000229
3
Version: E15
Test Circuits
Figure 1: V
KA
= V
REF
Figure 2: V
KA
> V
REF
Figure 3: Off-State Current
Additional Information – Stability
When The TS1431A/1431B is used as a shunt regulator, there are two options for selection of C
L
, are recommended
for optional stability:
A) No load capacitance across the device, decouple at the load.
B) Large capacitance across the device, optional decoupling at the load.
The reason for this is that TS1431A/1431B exhibits instability with capacitances in the range of 10nF to 1µF (approx.)
at light cathode current up to 3mA(typ). The device is less stable the lower the cathode voltage has been set for.
Therefore while the device will be perfectly stable operating at a cathode current of 10mA (approx.) with a 0.1µF
capacitor across it, it will oscillate transiently during start up as the cathode current passes through the instability region.
Select a very low capacitance, or alternatively a high capacitance (10µF) will avoid this issue altogether. Since the user
will probably wish to have local decoupling at the load anyway, the most cost effective method is to use no capacitance
at all directly across the device. PCB trace/via resistance and inductance prevent the local load decoupling from
causing the oscillation during the transient start up phase.
Note: if the TS1431A/1431B is located right at the load, so the load decoupling capacitor is directly across it, then this
capacitor will have to be 1nF or 10µF.
Applications Examples
Figure 4: Voltage Monitor
Figure 5: Output Control for Three Terminal
Fixed Regulator
P1-P3P4-P6P7-P9P10-P10

TS1431ACX RFG

Mfr. #:
Buy TS1431ACX RFG
Manufacturer:
Taiwan Semiconductor
Description:
Voltage References Voltage Reference 1% tolerance
Lifecycle:
New from this manufacturer.
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