TS432/432A/432B
Adjustable Precision Shunt Regulator
Sink Current Capability up to 100mA
General Description
The TS432/432A/432B 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. The TS432/432A/432B
has a typical output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making the
TS432/432A/432B excellent replacement for zener diode in many applications.
This series is offered in 3-pin TO-92, SOT-89, SOT-23 and 5-pin SOT-25 package.
Features
Precision Reference Voltage
TS432
1.24V±2%
TS432A 1.24V±1%
TS432B 1.24V±0.5%
Minimum Cathode Current for regulation: 150uA(typ)
Equivalent Full Range Temp. Coefficient: 50ppm/ C
Programmable Output Voltage up to 18V
Fast Turn-On Response
Sink Current Capability of 1.0 to 100 mA
Low Dynamic Output Impedance: 0.2Ω
Low Output Noise
o
Standard Application
Ordering Information
Part No.
TS432xCT
TS432xCY
TS432xCX
TS432xCX5
Note: Where
x
denotes voltage tolerance.
Blank: ±2%
A: ±1%
B: ±0.5%
-20 ~ +85 C
o
Block Diagram
Operating Temp.
(Ambient)
Package
TO-92
SOT-89
SOT-23
SOT-25
Pin Assignment
Pin No.
TS432/A/BCT
1
2
3
Pin
TS432/A/BCX5
4
5
3
1, 2
TS432/A/BCY
1
2
3
TS432/A/BCX
1
3
2
Description
Reference
Anode
Cathode
Non connect
2003/12 rev. A
TS432/A/B
1-7
Absolute Maximum Rating
Cathode Voltage (Note 1)
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation (Note 2, 3)
TO-92
TO-89
SOT-23 / SOT-25
Operating Junction Temperature Range
Storage Temperature Range
Note 2: Tj Max = 150 C
Note 3: Rating apply to ambient temperature at 25 C
o
o
Vka
Ik
Iref
20
-10 ~ 200
10
0.625
V
mA
mA
Pd
0.5
0.3
W
o
o
Tj
T
STG
0 ~ +125
-65 ~ +150
C
C
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Recommend Operating Condition
Cathode Voltage Range
Cathode Current Range (for regulation)
Vka
Ik
Ref ~ 18
1 ~ 100
V
mA
Electrical Characteristics
(Ta=25 C, unless otherwise specified.)
Parameter
Reference
voltage
TS432
TS432A
TS432B
Deviation of reference input
voltage, over temp. (Note 4)
Reference Input current
Radio of change in Vref to
change in cathode Voltage
Deviation of reference input
current, over temp.
Minimum operating cathode
current
Off-state Cathode Current
Dynamic Output Impedance
Vref
Ta = full range
Vka =Vref, Ik=10mA (Figure 1)
R1=10KΩ, R2=
∞
, Ika=10mA
(Figure 2)
Ika=10mA, Vka = 18V to Vref
(Figure 2)
Ta= full range
Iref(DEV)
R1=10KΩ, R2=
∞
, Ika=10mA
(Figure 2)
Ika(min)
Ioff
|Zka|
Vka=Vref (Figure 1)
Vref=0V (Figure 3)
f<1KHz, Vka=Vref
Ika=100uA to 15mA (Figure 1)
Vka=18V
--
--
--
60
0.5
0.2
200
2.0
0.5
uA
uA
Ω
--
0.1
4.0
uA
Vref
Vka =Vref, Ik=10mA (Figure 1)
Symbo
Test Conditions
Min
1.215
1.227
1.233
--
5
1.240
Typ
Max
1.264
1.252
1.246
20
mV
V
Unit
o
Iref
∆Vref
/
∆Vka
--
0.15
4.0
uA
--
-1.0
-2.7
mV/V
TS432/A/B
2-7
2003/12 rev. A
Note 4. Deviation of reference input voltage, VDEV, is defined as the maximum deviation of the reference over the full
temperature range.
The average temperature coefficient of the reference input voltage
αVref
is defined as:
|
αVref
| = [ V
DEV
/ Vref(25) ] * 10
6
/ T2 – T1
…………………….. (PPM/
o
C)
Where:
T2-T1
= full temperature change.
αVref
can be positive or negative depending on whether the slope is positive or negative.
Note 5. The dynamic output impedance, Rz, is defined as:
| Zka | =
∆Vka
/
∆Ika
When the device is programmed with two external resistors R1and R2 (see Figure 2). The dynamic output
impedance of the overall circuit, is defined as :
| Zka | =
∆v
/
∆i
|
≈
Zka | * ( 1 + R1 / R2)
Test Circuits
TS432/A/B
3-7
2003/12 rev. A
Application Examples
TS432/A/B
4-7
2003/12 rev. A
Typical Performance Characteristics
TS432/A/B
5-7
2003/12 rev. A
嵌入式系统
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