TS432
Adjustable Precision Shunt Regulator
SOT-23
Pin Definition:
1. Reference
2. Cathode
3. Anode
TO-92
Pin Definition:
1. Reference
2. Anode
3. Cathode
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 V
REF
(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
TS432A – 1.24V±1%
TS432B – 1.24V±0.5%
Minimum Cathode Current for Regulation: 20µA(typ.)
Equivalent Full Range Temp. Coefficient: 50ppm/ ºC
Programmable Output Voltage up to 18V
Fast Turn-On Response
Sink Current Capability of 80µA to 100mA
Low Dynamic Output Impedance: 0.05Ω
Low Output Noise
Halogen Free Available
Ordering Information
Part No.
Package
Packing
TS432xCX RFG
SOT-23
3,000pcs / 7” Reel
TS432xCT B0G
TO-92
1,000pcs / Bulk
TS432xCT A3G
TO-92
2,000pcs / Ammo
Note: Where
x
denotes voltage tolerance
A:
±1%,
B:
±0.5%
“G”
denotes for Halogen free products
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Applications
Voltage Monitor
Delay Timer
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
Cathode Voltage (Note 1)
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation
Junction Temperature
Operation Temperature Range
Storage Temperature Range
Symbol
V
KA
I
K
I
REF
P
D
T
J
T
OPER
T
STG
Limit
18
100
3
0.35
+150
0 ~ +70
-65 ~ +150
Unit
V
mA
mA
W
o
o
o
C
C
C
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Document Number: DS_P0000238
1
Version: F15
TS432
Adjustable Precision Shunt Regulator
Recommended Operating Condition
Parameter
Cathode Voltage
Continuous Cathode Current Range
(Note 1)
Symbol
V
KA
I
K
Limit
16
100
Unit
V
mA
Electrical Characteristics
(T
A
=25
o
C unless otherwise noted)
Parameter
Reference voltage
TS432A
TS432B
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.
Off-state Cathode Current
Dynamic Output Impedance
Symbol
V
REF
∆V
REF
∆V
REF
/∆V
KA
I
REF
∆I
REF
I
KA
(off)
|Z
KA
|
Test Conditions
V
KA
=V
REF
, I
K
=10mA
(Figure 1)
V
KA
=V
REF
, I
K
=10mA
T
A
= full range (Figure 1)
I
KA
=10mA, V
KA
= 16V to V
REF
(Figure 2)
R1=10KΩ, R2=
∞
, I
KA
=10mA
T
A
= full range (Figure 2)
R1=10KΩ, R2=
∞
, I
KA
=10mA
T
A
= full range (Figure 2)
V
REF
=0V (Figure 3),
V
KA
=16V
f<1KHz, V
KA
=V
REF
I
KA
=1mA to 100mA (Figure 1)
Min
1.227
1.233
--
--
--
--
--
--
Typ
1.240
10
-1.0
0.25
0.04
0.125
0.2
Max
1.252
1.246
25
-2.7
0.5
0.8
0.5
0.4
Unit
V
mV
mV/V
µA
µA
µA
Ω
Minimum Operating Cathode
I
KA(MIN)
V
KA
=V
REF
(Figure 1)
--
20
80
µA
Current
* 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 V
REF
Min. or V
REF
Max occurs at the lower ambient
temperature. Example:
∆V
REF
=7.2mV and the slope is positive, V
REF
=1.241V at 25°C,
∆T=125°C
* The dynamic impedance Z
KA
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:
Document Number: DS_P0000238
2
Version: F15
TS432
Adjustable Precision Shunt Regulator
Test Circuits
Figure 1: V
KA
= V
REF
Figure 2: V
KA
> V
REF
Figure 3: Off-State Current
Additional Information – Stability
When TS432 series 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 TS432 series 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 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
≥10µF.
Applications Examples
Figure 4: Voltage Monitor
Document Number: DS_P0000238
3
Figure 5: Output Control for Three Terminal
Fixed Regulator
Version: F15
TS432
Adjustable Precision Shunt Regulator
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_P0000238
4
Version: F15
TS432
Adjustable Precision Shunt Regulator
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_P0000238
5
Version: F15
PCB Design
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