TS431
Taiwan Semiconductor
2.495V Programmable Shunt Voltage Reference
GENERAL DESCRIPTION
TS431 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 TS431 series operates as a
shunt regulator, it can be used as either a positive or
negative stage reference.
FEATURES
● Precision Reference Voltage
TS431 –2.495V ±2%
TS431A – 2.495V ±1%
TS431B – 2.495V ±0.5%
● Equivalent Full Range Temp. Coefficient:
50ppm/°C
● Programmable Output Voltage up to 36V
● Fast Turn-On Response
● Sink Current Capability of 1~100mA
● Low Dynamic Output Impedance: 0.2Ω
● Low Output Noise
APPLICATION
● SMPS
● Lighting
● Telecommunication
● Home appliance
TO-92
Pin Definition:
1. Reference
2. Anode
3. Cathode
SOT-23
Pin Definition:
1. Reference
2. Cathode
3. Anode
SOP-8
Pin Definition
1. Cathode
2. Anode
3. Anode
4. N/C
5. N/C
6. Anode
7. Anode
8. Reference
Notes:
1. Moisture sensitivity level: level 3. Per J-STD-020 (SOP-8)
2. Moisture sensitivity level: level 1. Per J-STD-020 (SOT-23)
TYPICAL APPLICATIN CIRCUIT
Document Number: DS_P0000235
1
Version: H15
TS431
Taiwan Semiconductor
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Cathode Voltage
(Note 1)
SYMBOL
V
KA
I
K
I
REF
TO-92
SOT-23
SOP-8
LIMIT
37
-100 ~ +150
-0.05 ~ +10
0.625
UNIT
V
mA
mA
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation
Junction Temperature
Operating Temperature Range
Storage Temperature Range
P
D
T
J
T
OPER
T
STG
0.30
0.50
+150
0 ~ +70
-65 ~ +150
W
°C
°C
°C
RECOMMEND OPERATING CONDITION
PARAMETER
Cathode Voltage
Continuous Cathode Current Range
SYMBOL
V
KA
I
K
LIMIT
Ref ~ 36
1 ~ 100
UNIT
V
mA
ELECTRICAL CHARACTERISTICS
PARAMETER
Reference voltage
Deviation of reference
input voltage
Radio of change in Vref to
change in cathode
Voltage
Reference Input current
Deviation of reference
input current, over temp.
CONDITIONS
TS431A
TS431B
V
KA
= V
REF
, I
K
=10mA
Ta= full range
I
KA
=10mA,
V
KA
= 10V to V
REF
V
KA
= 36V to 10V
R1=10KΩ, R2=
∞
,
I
KA
=10mA
Ta= full range
R1=10KΩ, R2=
∞
,
I
KA
=10mA
Ta= full range
V
REF
=0V , V
KA
=36V
Off-state Cathode Current
V
REF
=0V , V
KA
=36V
T
J
=-25°C~125°C
(Value is defined by design)
f<1KHz, V
KA
= V
REF
I
KA
=1mA to 100mA
V
KA
= V
REF
I
KA
(off)
SYMBOL
V
REF
∆ V
REF
∆V
REF
/∆V
KA
MIN
2.470
2.483
--
--
--
--
TYP
2.495
3
-1.4
-1.0
0.7
MAX
2.520
2.507
17
-2.7
mV/V
-2.0
4.0
uA
UNIT
V
mV
I
REF
∆I
REF
--
--
--
0.4
--
--
1.2
1.0
30
uA
uA
Dynamic Output
Impedance
Minimum operating
cathode current
Note :
| Z
KA
|
I
KA
(min)
--
--
0.22
0.4
0.5
0.6
Ω
mA
1.
Voltage values are with respect to the anode terminal unless otherwise noted.
Document Number: DS_P0000235
2
Version: H15
TS431
Taiwan Semiconductor
ORDERING INFORMATION
PART NO.
TS431ACT B0G
TS431BCT B0G
TS431ACT A3G
TS431BCT A3G
TS431ACX RFG
TS431BCX RFG
TS431ACS RLG
TS431BCS RLG
TS431CS RLG
PACKAGE
TO-92
TO-92
TO-92
TO-92
SOT-23
SOT-23
SOP-8
SOP-8
SOP-8
PACKING
1,000pcs / Bulk
1,000pcs / Bulk
2,000pcs / Ammo
2,000pcs / Ammo
3,000pcs / 7” Reel
3,000pcs / 7” Reel
2,500pcs / 13” Reel
2,500pcs / 13” Reel
2,500pcs / 13” Reel
Note:
1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC.
2. Halogen-free according to IEC 61249-2-21 definition.
BLOCK DIAGRAM
*
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°C, minimum V
REF
=2.492V at 0°C, V
REF
=2.495V at 25°C, ΔT=70°C
6
αV
REF
| = [4mV / 2495mV] * 10 / 70°C ≈ 23ppm/°C
Because minimum V
REF
occurs at the lower temperature, the coefficient is positive.
* The dynamic impedance ZKA is defined as:
| Z
KA
| = ΔV
KA
/ ΔI
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
| = Δv / Δi | ≈ Z
KA
| * ( 1 + R1 / R2)
Document Number: DS_P0000235
3
Version: H15
TS431
Taiwan Semiconductor
ADDITIONAL INFORMATION – STABILITY
When The TS431/431A/431B 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 TS431/431A/431B exhibits instability with capacitances in the range of 10nF to 1uF (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 0.1uF 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 (10uF) 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 TS431/431A/431B is located right at the load, so the load decoupling capacitor is directly across it, then this
capacitor will have to be ≤1nF or ≥10uF.
APPLICATIONS EXAMPLES
Figure 1. Voltage Monitor
Figure 2. Output Control for Three Terminal Fixed
Regulator
Document Number: DS_P0000235
4
Version: H15
TS431
Taiwan Semiconductor
APPLICATIONS EXAMPLES (CONTINUE)
Figure 3. Shunt Regulator
Figure 4. High Current Shunt Regulator
Figure 6. Cons
tant Current Source
Figure 5. Series Pas
s Regulator
Figure 7. TRIAC Crowbar
Figure 8. SCR Crowbar
Document Number: DS_P0000235
5
Version: H15
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