Adjustable Precision Shunt Regulator

TS431
Adjustable Precision Shunt Regulator
SOT-89
Pin Definition:
1. Reference
2. Anode
3. Cathode
SOT-23
Pin Definition:
1. Reference
2. Cathode
3. Anode
SOP-8
Pin Definition:
1. Cathode 8. Reference
2. Anode
7. Anode
3. Anode
6. Anode
4. N/C
5. N/C
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
TO-92
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 VREF 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/ ºC
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
Ordering Information
Part No.
Package
Packing
TS431xCT B0G
TO-92
1,000pcs / Bulk
TS431xCT A3G
TO-92
2,000pcs / Ammo
TS431xCX RFG
SOT-23
3,000pcs / 7” Reel
TS431xCY RMG
SOT-89
1,000pcs / 7” Reel
TS431xCS RLG
SOP-8
2,500pcs / 13” Reel
Note: Where xx denotes voltage tolerance
Blank: ±2%, A: ±1%, B: ±0.5%
“G” denotes for Halogen free products
Block Diagram
Absolute Maximum Rating (Ta = 25oC unless otherwise noted)
Parameter
Symbol
Cathode Voltage (Note 1)
Continuous Cathode Current Range
Reference Input Current Range
Limit
37
-100 ~ +150
-0.05 ~ +10
TO-92
0.625
PD
Power Dissipation
SOT-23
0.30
SOT-89 / SOP-8
0.50
Junction Temperature
TJ
+150
Operating Temperature Range
TOPER
0 ~ +70
Storage Temperature Range
TSTG
-65 ~ +150
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Document Number: DS_P0000235
VKA
IK
IREF
1
Unit
V
mA
mA
W
o
C
C
o
C
o
Version: G15
TS431
Adjustable Precision Shunt Regulator
Recommend Operating Condition
Symbol
Limit
Unit
VKA
IK
Ref ~ 36
1 ~ 100
V
mA
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Parameter
Cathode Voltage (Note 1)
Continuous Cathode Current Range
Recommend Operating Condition
Parameter
Symbol
TS431
Reference voltage
TS431A
TS431B
Deviation of reference input
voltage
Radio of change in Vref to
change in cathode Voltage
VREF
∆ VREF
∆VREF
/∆VKA
Reference Input current
IREF
Deviation of reference input
current, over temp.
∆IREF
Off-state Cathode Current
Dynamic Output Impedance
IKA (off)
| ZKA |
Test Conditions
VKA =VREF, IK =10mA (Figure 1)
o
Ta=25 C
VKA = VREF, IK =10mA (Figure 1)
Ta= full range
IKA =10mA, VKA = 10V to VREF
VKA = 36V to 10V (Figure 2)
R1=10KΩ, R2= ∞ , IKA =10mA
Ta= full range (Figure 2)
R1=10KΩ, R2= ∞ , IKA =10mA
Ta= full range (Figure 2)
VREF =0V (Figure 3), VKA =36V
VREF =0V (Figure 3), VKA =36V
TJ=-25ºC~125ºC
(Value is defined by design)
f<1KHz, VKA = VREF
IKA =1mA to 100mA (Figure 1)
Typ
Max
Unit
2.446
2.470
2.483
Min
2.495
2.550
2.520
2.507
V
--
3
17
mV
---
-1.4
-1.0
-2.7
-2.0
mV/V
--
0.7
4.0
uA
--
0.4
1.2
uA
--
--
1.0
uA
--
--
30
uA
--
0.22
0.5
Ω
Minimum operating cathode
VKA = VREF (Figure 1)
-0.4
0.6
mA
IKA (min)
current
* The deviation parameters ∆VREF and ∆IREF 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, αVREF is defined as:
Where: T2-T1 = full temperature change.
αVREF can be positive or negative depending on whether the slope is positive or negative.
o
o
o
o
Example: Maximum VREF=2.496V at 30 C, minimum VREF =2.492V at 0 C, VREF =2.495V at 25 C, ∆T=70 C
αVREF | = [4mV / 2495mV] * 106 / 70oC ≈ 23ppm/oC
Because minimum VREF occurs at the lower temperature, the coefficient is positive.
* The dynamic impedance ZKA is defined as:
| ZKA | = ∆VKA / ∆IKA
* 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:
| ZKA | = ∆v / ∆i | ≈ ZKA | * ( 1 + R1 / R2)
Document Number: DS_P0000235
2
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Test Circuits
Figure 1: VKA = VREF
Figure 2: VKA > VREF
Figure 3: Off-State Current
Additional Information – Stability
When The TS431/431A/431B is used as a shunt regulator, there are two options for selection of CL, 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 4: Voltage Monitor
Document Number: DS_P0000235
Figure 5: Output Control for Three Terminal
Fixed Regulator
3
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Applications Examples (Continue)
Figure 6: Shunt Regulator
Figure 7: High Current Shunt Regulator
Figure 8: Series Pass Regulator
Figure 9: Constant Current Source
Figure 10: TRIAC Crowbar
Figure 11: SCR Crowbar
Document Number: DS_P0000235
4
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Applications Examples (Continue)
Vin
<Vref
>Vref
Vout
V+
≈0.74V
Figure 12: Single-Supply Comparator with
Temperature-Compensated Threshold
Figure 13: Constant Current Sink
Figure 14: Delay Timer
Document Number: DS_P0000235
5
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Typical Performance Characteristics
Test Circuit for Voltage Amplification
Figure 14: Small-Signal Voltage Gain and Phase Shirt vs. Frequency
Test Circuit for Reference Impedance
Figure 15: Reference Impedance vs. Frequency
Document Number: DS_P0000235
6
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Typical Performance Characteristics (Continue)
Test Circuit for Curve A
The areas under the curves represent conditions that may
cause the device to oscillate. For curves B, C, and D, R2
and V+ were adjusted to establish the initial VKA and IKA
conditions with CL=0. VBATT and CL then were adjusted to
determine the ranges of stability.
Test Circuit for Curve B, C and D
Figure 16: Stability Boundary Condition
Test Circuit for Pulse Response, Ik=1mA
Figure 17: Pulse Response
Document Number: DS_P0000235
7
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Electrical Characteristics
Figure 18: Reference Voltage vs. Temperature
Figure 19: Reference Current vs. Temperature
Figure 20: Cathode Current vs. Cathode Voltage
Document Number: DS_P0000235
8
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
TO-92 Mechanical Drawing
DIM
A
B
C
D
E
F
G
H
TO-92 DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
4.30
4.70
0.169
0.185
4.30
4.70
0.169
0.185
13.53 (typ)
0.532 (typ)
0.39
0.49
0.015
0.019
1.18
1.28
0.046
0.050
3.30
3.70
0.130
0.146
1.27
1.31
0.050
0.051
0.33
0.43
0.013
0.017
Marking Diagram
X = Tolerance Code
(A = ±1%, B = ±0.5%, C = ±0.25%, Blank = ±2%,)
Y = Year Code
M = Month Code for Halogen Free Product
O =Jan P =Feb Q =Mar R =Apr
S =May T =Jun U =Jul
V =Aug
W =Sep X =Oct
Y =Nov Z =Dec
L = Lot Code
Document Number: DS_P0000235
9
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
SOT-23 Mechanical Drawing
DIM
A
A1
B
C
D
E
F
G
H
I
J
SOT-23 DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX.
0.95 BSC
0.037 BSC
1.9 BSC
0.074 BSC
2.60
3.00
0.102
0.118
1.40
1.70
0.055
0.067
2.80
3.10
0.110
0.122
1.00
1.30
0.039
0.051
0.00
0.10
0.000
0.004
0.35
0.50
0.014
0.020
0.10
0.20
0.004
0.008
0.30
0.60
0.012
0.024
5º
10º
5º
10º
Marking Diagram
1 = Device Code
X = Tolerance Code
(A = ±1%, B = ±0.5%, C = ±0.25%, Blank = ±2%,)
Y = Year Code
M = Month Code for Halogen Free Product
O =Jan P =Feb Q =Mar R =Apr
S =May T =Jun U =Jul
V =Aug
W =Sep X =Oct
Y =Nov Z =Dec
L = Lot Code
Document Number: DS_P0000235
10
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
SOT-89 Mechanical Drawing
DIM
A
B
C
D
E
F
G
H
I
J
SOT-89 DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
4.40
4.60
0.173
0.181
1.50
1.7
0.059
0.070
2.30
2.60
0.090
0.102
0.40
0.52
0.016
0.020
1.50
1.50
0.059
0.059
3.00
3.00
0.118
0.118
0.89
1.20
0.035
0.047
4.05
4.25
0.159
0.167
1.4
1.6
0.055
0.068
0.35
0.44
0.014
0.017
Marking Diagram
Y
M
L
CY
Document Number: DS_P0000235
= Year Code
= Month Code for Halogen Free Product
O =Jan
P =Feb
Q =Mar
S =May
T =Jun
U =Jul
W =Sep
X =Oct
Y =Nov
= Lot Code
= Package Code
11
R =Apr
V =Aug
Z =Dec
Version: G15
TS431
Adjustable Precision Shunt Regulator
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
SOP-8 Mechanical Drawing
DIM
A
B
C
D
F
G
K
M
P
R
SOP-8 DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX.
4.80
5.00
0.189
0.196
3.80
4.00
0.150
0.157
1.35
1.75
0.054
0.068
0.35
0.49
0.014
0.019
0.40
1.25
0.016
0.049
1.27BSC
0.05BSC
0.10
0.25
0.004
0.009
0º
7º
0º
7º
5.80
6.20
0.229
0.244
0.25
0.50
0.010
0.019
Marking Diagram
Y
M
L
Document Number: DS_P0000235
= Year Code
= Month Code for Halogen Free Product
O =Jan
P =Feb
Q =Mar
S =May
T =Jun
U =Jul
W =Sep
X =Oct
Y =Nov
= Lot Code
12
R =Apr
V =Aug
Z =Dec
Version: G15
TS431
TS
43 No
1C t
X/ Rec
TS TS om
43 431 m
1C A en
Y/ CY de
TS /T d
43 S4
1C 31
T BC
Y
Adjustable Precision Shunt Regulator
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to any
intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for
such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale
and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability,
or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers
using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for
any damages resulting from such improper use or sale.
Document Number: DS_P0000235
13
Version: G15