TS432
Adjustable Precision Shunt Regulator
1/12 Version: C07
TO-92
SOT-23
SOT-25
General Description
TS432 series is a three-terminal adjustable shunt regulator with specified thermal stability. The output voltage may be
set to any value between Vref (approximately 1.24V) and 18V with two external resistors. TS432 series has a typical
output impedance of 0.05Ω. Active output circuitry provides a very sharp turn-on characteristic, making TS432 series
excellent replacement for zener diode in many applications.
Features
● Precision Reference Voltage
TS432 – 1.24V±2%
TS432A – 1.24V±1%
TS432B – 1.24V±0.5%
● Minimum Cathode Current for Regulation: 20uA(typ.)
● Equivalent Full Range Temp. Coefficient: 50ppm/ ºC
● Programmable Output Voltage up to 18V
● Fast Turn-On Response
● Sink Current Capability of 80uA to 100mA
● Low Dynamic Output Impedance: 0.05Ω
● Low Output Noise
● Halogen Free Available
Part No.
Package
Packing
TS432xCT B0
TO-92
1Kpcs / Bulk
TS432xCT B0G
TO-92
1Kpcs / Bulk
TS432xCT A3
TO-92
2Kpcs / Ammo
TS432xCT A3G
TO-92
2Kpcs / Ammo
TS432xCX RF
SOT-23
3Kpcs / 7” Reel
TS432xCX RFG
SOT-23
3Kpcs / 7” Reel
TS432xCX5 RF
SOT-25
3Kpcs / 7” Reel
TS432xCX5 RFG
SOT-25
3Kpcs / 7” Reel
Application
● Voltage Monitor
● Delay Timmer
● Constant –Current Source/Sink
● High-Current Shunt Regulator
● Crow Bar
● Over-Voltage / Under-Voltage Protection
Absolute Maximum Rating (Ta = 25oC unless otherwise noted)
Parameter
Symbol
Limit
Unit
Cathode Voltage (Note 1)
Vka
18
V
Continuous Cathode Current Range
Ik
100
mA
Reference Input Current Range
Iref
3
mA
TO-92
0.625
SOT-23
0.35
Power Dissipation
SOT-25
Pd
0.35
W
Junction Temperature
TJ
+150
oC
Operation Temperature Range
TOPER
0 ~ +70
oC
Storage Temperature Range
TSTG
-65 ~ +150
oC
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Pin Definition:
1. Reference
2. Cathode
3. Anode
Pin Definition:
1. Reference
2. Anode
3. Cathode
Pin Definition:
1. N/C
2. N/C *
3. Cathode
4. Reference
5. Anode
* (pin 2 is connect to substrate
and must be connected to Anode
or left open)
TS432
Adjustable Precision Shunt Regulator
2/12 Version: C07
Recommend Operating Condition
Parameter
Symbol
Limit
Unit
Cathode Voltage (Note 1)
Vka
16
V
Continuous Cathode Current Range
Ik
100
mA
Recommend Operating Condition
Parameter
Symbo
Test Conditions
Min
Typ
Max
Unit
TS432
1.215
1.264
TS432A
1.227
1.252
Reference voltage
TS432B
Vref
Vka =Vref, Ik=10mA (Figure 1)
Ta=25oC
1.233
1.240
1.246
V
Deviation of reference input
voltage
∆Vref
Vka =Vref, Ik=10mA
Ta= full range (Figure 1)
--
10
25
mV
Radio of change in Vref to
change in cathode Voltage
∆Vref/∆Vka
Ika=10mA, Vka = 16V to Vref
(Figure 2)
--
-1.0
-2.7
mV/V
Reference Input current
Iref
R1=10KΩ, R2=
∞
, Ika=10mA
Ta= full range (Figure 2)
--
0.25
0.5
uA
Deviation of reference input
current, over temp.
∆Iref
R1=10KΩ, R2=
∞
, Ika=10mA
Ta= full range (Figure 2)
--
0.04
0.8
uA
Off-state Cathode Current
Ika(off)
Vref=0V (Figure 3),
Vka=16V
--
0.125
0.5
uA
Dynamic Output Impedance
|Zka|
f<1KHz, Vka=Vref
Ika=1mA to 100mA (Figure 1)
--
0.2
0.4
Ω
Minimum Operating Cathod
Current
Ika(min)
Vka=Vref (Figure 1)
--
20
80
uA
* 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 Vref Min. or Vref Max occurs at the lower ambient
temperature. Example: ∆Vref=7.2mV and the slope is postive, Vref=1.241V at 25oC, ΔT=125oC
* The dynamic impedance ZKA is defined as:
* 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:
TS432
Adjustable Precision Shunt Regulator
3/12 Version: C07
Test Circuits
Figure 1: Vka = Vref
Figure 2: Vka > Vref
Figure 3: Off-State Current
Additional Information – Stability
When TS432 series 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 TS432 series 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 TS432 series 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
Figure 5: Output Control for Three Terminal
Fixed Regulator
TS432
Adjustable Precision Shunt Regulator
4/12 Version: C07
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
TS432
Adjustable Precision Shunt Regulator
5/12 Version: C07
Applications Examples (Continue)
Vin
Vout
<Vref
V+
>Vref
≈0.74V
Figure 12: Single-Supply
Comparator with Temperature-
Compensated Threshold
Figure 13: Constant Current Sink
Figure 14: Delay Timer
TS432
Adjustable Precision Shunt Regulator
6/12 Version: C07
Typical Performance Characteristics
Test Circuit for Voltage Amplification
Figure 14: Small-Signal Voltage Gain and Phase Shift vs. Frequency
Test Circuit for Reference Impedance
Figure 15: Reference Impedance vs. Frequency
TS432
Adjustable Precision Shunt Regulator
7/12 Version: C07
Typical Performance Characteristics
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 A
Test Circuit for Curve B, C and D
Figure 16: Stability Boundary Condition
Test Circuit for Pulse Response, Ik=1mA
Figure 17: Pulse Response
TS432
Adjustable Precision Shunt Regulator
8/12 Version: C07
Electrical Characteristics
Figure 18: Reference Voltage vs. Temperature
Figure 19: Reference Current vs. Temperature
Figure 20: Cathode Current vs. Cathode Voltage
TS432
Adjustable Precision Shunt Regulator
9/12 Version: C07
TO-92 Mechanical Drawing
Marking Diagram
X
= Tolerance Code
(A = ±1%, B = ±0.5%, Blank = ±2%,)
Y
= Year Code
M
= Month Code
(A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep,
J=Oct, K=Nov, L=Dec)
= Month Code for Halogen Free Product
(O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep,
X=Oct, Y=Nov, Z=Dec)
L
= Lot Code
TO-92 DIMENSION
MILLIMETERS
INCHES
DIM
MIN
MAX
MIN
MAX
A
4.30
4.70
0.169
0.185
B
4.30
4.70
0.169
0.185
C
14.30(typ)
0.563(typ)
D
0.43
0.49
0.017
0.019
E
2.19
2.81
0.086
0.111
F
3.30
3.70
0.130
0.146
G
2.42
2.66
0.095
0.105
H
0.37
0.43
0.015
0.017
TS432
Adjustable Precision Shunt Regulator
10/12 Version: C07
SOT-23 Mechanical Drawing
Marking Diagram
2
= Device Code
X
= Tolerance Code
(A = ±1%, B = ±0.5%, C = ±2%,)
Y
= Year Code
M
= Month Code
(A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep,
J=Oct, K=Nov, L=Dec)
= Month Code for Halogen Free Product
(O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep,
X=Oct, Y=Nov, Z=Dec)
L
= Lot Code
SOT-23 DIMENSION
MILLIMETERS
INCHES
DIM
MIN
MAX
MIN
MAX.
A
0.95 BSC
0.037 BSC
A1
1.9 BSC
0.074 BSC
B
2.60
3.00
0.102
0.118
C
1.40
1.70
0.055
0.067
D
2.80
3.10
0.110
0.122
E
1.00
1.30
0.039
0.051
F
0.00
0.10
0.000
0.004
G
0.35
0.50
0.014
0.020
H
0.10
0.20
0.004
0.008
I
0.30
0.60
0.012
0.024
J
5º
10º
5º
10º
TS432
Adjustable Precision Shunt Regulator
11/12 Version: C07
SOT-25 Mechanical Drawing
Marking Diagram
2
= Device Code
X
= Tolerance Code
(A = ±1%, B = ±0.5%, C = ±2%,)
Y
= Year Code
M
= Month Code
(A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep,
J=Oct, K=Nov, L=Dec)
= Month Code for Halogen Free Product
(O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep,
X=Oct, Y=Nov, Z=Dec)
L
= Lot Code
SOT-25 DIMENSION
MILLIMETERS
INCHES
DIM
MIN
MAX
MIN
MAX.
A+A1
0.09
1.25
0.0354
0.0492
B
0.30
0.50
0.0118
0.0197
C
0.09
0.25
0.0035
0.0098
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
E
1.90 BSC
0.0748 BSC
H
2.40
3.00
0.09449
0.1181
L
0.35 BSC
0.0138 BSC
Ө1
0º
10º
0º
10º
S1
0.95 BSC
0.0374 BSC
TS432
Adjustable Precision Shunt Regulator
12/12 Version: C07
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
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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.
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any damages resulting from such improper use or sale.